WO2002078032A1

WO2002078032A1 - Circuit breaker

Info

Publication number: WO2002078032A1
Application number: PCT/JP2001/002486
Authority: WO
Inventors: Toshiyuki Sugano; Takamitsu Fujimoto; Takao Mitsuhashi; Mitsuru Tsukima; Masahiro Fushimi; Shigeki Koumoto; Yoshio Asou
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2001-03-27
Filing date: 2001-03-27
Publication date: 2002-10-03
Also published as: CN1426592A; JPWO2002078032A1; TW563151B; CN1255837C; EP1313121A1

Abstract

A small circuit breaker which effectively provides interception for overload protection and short-circuit protection while exhibiting outstanding flame retardancy. The circuit breaker comprises a fixed contact member or conductor carrying a fixed contact, a movable contact member carrying a movable contact for engagement with the fixed contact, a switch mechanism for rotating the movable contact member, an arc-extinguishing device for extinguishing an arc when the movable contact is engaged or disengaged with the fixed contact, and a housing for enclosing the components described above. The arc-extinguishing device is provided with an arc-extinguishing member that entirely covers the fixed contact member. The arc-extinguishing member includes an arc-extinguishing mold of insulator with a base material of frame-retardant non-halogen resin.

Description

Description Circuit breaker Technical field

The present invention relates to a circuit breaker. Background art

1 and 2 are cross-sectional views of the circuit breaker. FIG. 1 shows an ON state of the circuit breaker, and FIG. 2 shows an OFF state of the circuit breaker. FIG. 3 is a side view (a) and a plan view (b) showing an enlarged view of an arc extinguishing member of an arc extinguishing device for a circuit breaker. In the figure, 1 is a movable contact made of a conductor such as copper, 2 is a movable contact fixed to one end of the movable contact 1, 3 is a fixed contact that comes into contact with or separates from the movable contact 2, 4 is a fixed contact 3 fixed. The fixed contact 5 having a body made of copper or the like is a power-supply-side terminal formed at the other end of the fixed contact 4, and a wiring is connected from an external power supply. Reference numeral 6 denotes a plurality of arc extinguishing devices (grids) made of magnetic metal that is stacked and arranged with a gap therebetween to cool and extinguish an arc generated between the movable contact 2 and the fixed contact 3. 6a, the arc-extinguishing side plate 6b that holds the grid 6a on both sides, and the arc-extinguishing member 6c shown in Fig. 3.The arc-extinguishing member 6c and the arc-extinguishing side plate 6b are made of an insulating material. . The arc-extinguishing member 6c is provided between the movable contact 2 and the fixed contact 3, and is provided so as to cover the entire surface of the fixed contact 4 exposed to the arc with the fixed contact 3 exposed. 7 is an opening / closing mechanism for rotating the movable contact 1 to open and close, 8 is a handle for manually operating the opening / closing mechanism 7, 9 is a bow I remover, and 10 is a load terminal. It is. Reference numeral 11 denotes a force par, and 12 denotes a base. The parts are stored and fixed, and constitute a part of the housing 16. Reference numeral 13 denotes an end plate for isolating the terminal portion 5 from the inside of the housing 16 and having an exhaust port 13a for discharging hot gas by an arc. Inserted and mounted. Reference numeral 14 denotes an arc runner for driving the arc toward the terminal portion 5.

Next, the operation of the circuit breaker will be described. In FIG. 1, when the handle 8 is operated, the opening / closing mechanism 7 operates, the movable contact 1 rotates, and the movable contact 2 and the fixed contact 3 are separated from each other. The terminal 5 is connected to the power supply, the terminal 10 is connected to the load, and the power is supplied from the power supply to the load by contacting the contacts. In this state, the movable contact 2 is pressed against the fixed contact 3 with a specified contact pressure in order to ensure the reliability of energization. Here, if an overcurrent flows to the load side, the overcurrent is detected by the trip device 9 and the switching mechanism 動作 operates to generate an arc 15 between the two contacts 2 and 3 as shown in FIG. I do.

On the other hand, when a large overcurrent flows in the circuit due to a short circuit accident or the like, the electromagnetic repulsion at the contact surface between the two contacts 2 and 3 increases, and the movable contact 2 overcomes the contact pressure applied to the movable contact 2. The child 1 rotates without waiting for the operation of the tripping device 9 and the opening / closing mechanism Ί, and the contacts 2 and 3 are separated. The arc voltage increases as the separation distance from the fixed contact 3 to the movable contact 2 increases, and at the same time further increases because the arc 15 is attracted and extended by the magnetic force in the direction of the arc-extinguishing device 6. You. In this way, the arc current reaches the current zero point, extinguishes the arc 15 and the interruption stops.

In other words, the arc-extinguishing plate 6a of the arc-extinguishing device 6 absorbs the heat of the arc 15 and cools and, at the same time, bends the arc 15 to act to separate the contact between the movable contact 2 and the fixed contact 3. . The arc-extinguishing member 6 c prevents the starting point of the arc from the movable contact 2 to the fixed contact 4 (arc stop), and generates a pyrolysis gas when exposed to the high-temperature arc 15. This pyrolysis gas acts as an arc-extinguishing gas that cools and blows out the arc 15.

In recent years, circuit breakers have tended to be more compact as switchboard sizes have shrunk, and the level of flame retardancy required for plastic materials used in circuit breakers has tended to increase. .

Specifically, the globalization of product sales calls for products that comply with the European IEC 6947 standard and the US UL 746 standard. In both standards, the IEC 60947 standard covers global wire ignition with regard to the flame retardancy of materials that hold energized parts, such as arc extinguishers, which have relatively low ULHB requirements in Japan. (GW I) 960 ° C or higher and hot wire ignition (HW I) is UL 94-V0 HW I index 4 or UL 94-V 2 stipulates HW I index 2 or higher, whereas UL 746 standard requires V 0 or higher at UL 94 and the highest level of flame retardancy in each standard Has been done.

As a countermeasure, application of a flame-retardant resin to an arc-extinguishing member is considered. A typical example is a halogen-retardant resin filled with a halogen compound such as bromine, which is effective with a small filling amount.

However, because of the fact that the flame retardant resin generated by exposure to the arc contains an active component of the metal in the pyrolysis gas generated by the arc, metal corrosion is remarkable and electrode contact failure is caused. Becomes impossible. In particular, in the case of halogen compounds, the arc extinguishing performance is deteriorated due to the presence of halogen ions in the decomposition gas converted into plasma due to the high temperature of the arc (7000 to 20000 ° C). In order to ensure the cutoff, it is necessary to increase the distance between the electrodes, and it has been difficult to reduce the size of the switchgear.

Non-halogen flame-retardant resins have been actively developed in recent years, such as flame-retardant resins filled with inorganic flame retardants such as phosphorus compound, silicon resin or aluminum hydroxide, and resins themselves such as polyphenylene sulfide. Aromatic resins having flame retardancy are known.

Phosphorus compound-based flame retardants are generally difficult to use, and particularly in systems using red phosphorus, metal corrosion is more severe than in halogen-based systems, and power cannot be applied after repeated interruption due to defective electrode contacts.

In addition, for flame-retardant resins filled with silicon resin-based flame retardants and inorganic flame retardants, insulating ceramics such as metal oxides and silicon oxides generated in the plasma field of pyrolysis gas are deposited on electrode contacts. The deposition induces a contact failure that contaminates the electrode surface, making it impossible to energize after repeated interruptions. In addition, inorganic flame retardants must be highly filled in order to exhibit flame retardancy. However, general-purpose inorganic flame retardants (aluminum hydroxide and magnesium hydroxide) are required for kneading into heat-resistant high-melting thermoplastic resins. If the thermal decomposition temperature of is too low to achieve high filling and flame retardancy is unsatisfactory, or if high filling into low melting thermoplastic resin is achieved and flame retardancy is satisfied, arc extinguishing members Has a reduced mechanical strength. On the other hand, aromatic resins, such as polyphenylene sulfide, exhibit flame retardancy with the resin itself. Since fat has a high carbon content in one polymer molecule, the breaking performance tends to deteriorate.In order to secure the breaking performance, the distance between the arc and the fixed contact must be increased, and the circuit breaker must be downsized. And other problems.

The present invention has been made in order to solve the above-mentioned problems, and it has been made difficult to suppress poor electrical conduction due to corrosion and contamination of electrode contacts due to flame retardancy, or to suppress mechanical strength reduction and insulation deterioration. An object of the present invention is to provide a circuit breaker that is excellent in flammability and breaking performance and can be downsized. Disclosure of the invention

The present invention provides: a fixed contact having a fixed contact fixed to a conductor; a movable contact having a movable contact fixed to and separated from the fixed contact; an opening and closing mechanism for rotating the movable contact; In a circuit breaker including an arc extinguishing device for extinguishing an arc generated when a contact and a movable contact come and go, and a housing for accommodating the arc, the arc extinguishing device includes the fixed contact An arc extinguishing member is provided so as to cover the entire surface, and the arc extinguishing member includes an arc extinguishing insulating material formed mainly from a non-halogen flame-retardant resin. Things.

The present invention also provides the circuit breaker described above, wherein the arc-extinguishing insulating material molded product contains a triazine-based organic compound as a flame retardant. The present invention also provides the circuit breaker described above, wherein the matrix resin of the arc-extinguishing insulating material molded body is a polyamide.

It is another object of the present invention to provide the circuit breaker described above, wherein the polyamide, which is a matrix resin of the arc-extinguishing insulating material molded product, is a non-aromatic polyamide.

The non-halogen flame-retardant resin is composed of 10% by weight or less of organic fibers based on the non-halogen flame-retardant resin, and 15% by weight or less of a ceramic wisdom based on the non-halogen flame-retardant resin. The circuit breaker according to the present invention is characterized by containing one or more fillers selected from the group.

Further, in the present invention, the arc-extinguishing member is formed of a laminate of an arc-exposed layer exposed to an arc, and a backup layer supporting the arc-exposed layer, wherein the arc-exposed layer is made of a non-halogen flame-retardant resin An arc extinguishing insulating material molded body as a main component, and Layer is selected from the group consisting of glass fibers, inorganic minerals and ceramic fibers

It is intended to provide the above-mentioned circuit breaker, which is made of a flame-retardant resin containing at least one kind.

The present invention also provides the circuit breaker described above, wherein a part of the backup layer penetrates the arc-receiving layer at a plurality of locations. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view showing an ON state of the circuit breaker.

FIG. 2 is a partial cross-sectional view showing an off state of the circuit breaker.

FIG. 3 is a side view (a) and a plan view (b) of the arc extinguishing member.

FIG. 4 is a perspective view of the arc extinguishing member.

FIG. 5 is a perspective view (a) of an example of a two-layer structure of the arc extinguishing member, and (b) of another example. Embodiment of the Invention

Hereinafter, the circuit breaker of the present invention will be further described.

The circuit breaker of the present invention is an arc-extinguishing member that is closest to the arc of the arc-extinguishing device 6 that is exposed to the arc generated between the contacts 2 and 3 in the configuration of the main part of FIGS. The feature of 6c is that an arc-extinguishing insulating material molded article mainly composed of non-halogen flame-retardant resin is used.

The arc-extinguishing insulating material molded product preferably contains a triazine-based organic compound as a flame retardant.

Examples of such triazine-based organic compounds include compounds described in Japanese Patent Application Publication No. Sho 53-31759, and in particular, metal corrosion or metal in the pyrolysis gas generated by exposure to an arc Oxides that do not contain oxides are preferred.Specifically, for example, melamine derivatives such as melamin, ammelide, ammeline, formoguanamine, guanylmelamine, cyanomemelamine, arylegamine, melam, melem, melon, melamine compounds or melamine condensation Melamines containing substances; trimethyl cyanurate, triethyl cyanurate, tri (n-propyl) cyanurate, methyl shear Cyanuric acid compounds such as nurate and getylcyanurate, and isocyanuric acid compounds such as trimethyl isocyanurate, triethyl isocyanurate, tri (n-propyl) isocyanurate, methyl isocyanurate and getyl isocyanurate.

These triazine-based organic compounds are preferably contained in an amount of 5 to 20% by weight, preferably 10 to 15% by weight, based on a matrix resin described below.

Further, the matrix resin of the arc-extinguishing insulating material molded product may be, for example, a polyolefin, a polyolefin copolymer, a polyacetal, or a polyacetyl copolymer described in Japanese Patent Publication No. 7-250355. , Polyamides, polyamide copolymers, etc. in the pyrolysis gas generated by exposure to an arc, such as metal corrosion, electrode contact contamination or free carbon. Those having a low content are preferred, and more preferably, nylon 12, nylon 11, nylon 61, nylon 6, nylon 6, nylon 66, which have excellent mechanical properties--compatibility with the triazine-based organic compound. Polyamides such as nylon 46, nylon 6T, and nylon 9 よく are good, and non-aromatic polyamides such as nylon 6, nylon 66, and nylon 46 with low carbon content are arc-coated. Formation of the surface carbide layer of the arc extinguishing insulative material molded body is less favorable preferable due.

In addition, the non-halogen flame-retardant resin contains 10% by weight or less of organic fibers based on the non-halogen flame-retardant resin, and the ceramic whisker contains 15% by weight or less based on the non-halogen flame-retardant resin. It preferably contains one or more fillers selected from the group consisting of:

Examples of the organic fiber used in the present invention include ultra-high molecular weight polyethylene fiber, nylon fiber, polyarylate fiber, aramide fiber, polyparaphenylenebenzobenzoxazole, phenol fiber, etc. Preferably, in consideration of the kneadability with the matrix resin, the melting point above the molding temperature, the decomposition temperature, and the mechanical properties, aramide fibers, polyparaphenylene benzobisoxazole fibers and the like are preferred.

The ceramics used in the present invention include alumina, zinc oxide, magnesium hydroxide, silicon nitride, silicon carbide, potassium titanate, and aluminum borate. Whiskers of needle-like crystals having a diameter of several μm or less, such as metal oxides, hydroxides, nitrides, carbides, and borate compounds, but preferably do not impair the insulation resistance of the molded product It is difficult to be ionized by an arc, and magnesium hydroxide whiskers and aluminum borate are preferred from the viewpoint of availability.

In general, a flame-retardant resin containing a triazine-based organic compound is formed by a filler layer, such as an inorganic compound or glass fiber, which is used to form a layer forming a flame-retardant effect when the triazine organic compound is burned. It is known that combustion residue such as glass is destroyed, that is, flame retardancy is deteriorated due to the candle effect of the combustion residue remaining on the surface of the molded body. Organic fibers and ceramic wisdom, which have less residual combustion on the body surface, were used.

In the arc-extinguishing insulating material molded body used in the present invention, a resin pellet containing a flame retardant, or a flame retardant powder and a neat resin pellet are simultaneously introduced into a hopper of an extruder, and thereafter, an organic fiber or a ceramic resin is melted into a resin. A predetermined amount is added into the zone through a side feeder of an extruder to prepare a pellet-shaped non-halogen flame-retardant resin, which can be obtained by molding by a known injection molding method.

In the present invention, the arc-extinguishing member may be constituted by a laminate of an arc-exposed layer exposed to an arc and a backup layer supporting the arc-exposed layer.

For example, when an arc-extinguishing insulating material molded body 6a as shown in FIG. 4 is used as an arc-extinguishing member, for example, as shown in FIG. 5a, the arc-receiving layer 6a-1 is made of a non-halogen flame-retardant resin. An arc-extinguishing insulating material molded product as a main component, and the backup layer 6a-2 is made of a flame-retardant resin containing at least one selected from the group consisting of glass fibers, inorganic minerals, and ceramic fibers. be able to. In addition, as shown in FIG. 5B, a part of the back-up layer resin 6a-2 penetrates the arc-receiving layer 6a-1 at a plurality of locations, for example, in a comb shape. In a preferred embodiment, the bonding strength between 1 and the backup layer 6a-2 is strengthened.

The filler for reinforcing the flame-retardant resin contained in the backup layer 6a-2 is a general-purpose glass fiber, inorganic mineral and / or ceramic fiber, and is not particularly limited as long as the insulation resistance of the molded product is not impaired. . The amount of the filler is preferably 5 to 50% by weight, and more preferably 15 to 30% by weight, based on the matrix resin described below. Ma If necessary, an appropriate amount of a halogen-based flame retardant can be used. In addition, since the back-up layer 6a-2 is disposed on the back side of the arc-receiving layer 6a-1 or away from the high-energy arc core with respect to the arc, it is exposed to a relatively weak arc wind wrapping around. Therefore, the thermal decomposition by the arc and the formation of the carbonized layer are relatively small. For this reason, the flame retardant is not particularly limited as long as it does not impair the mechanical strength of the back-up layer as long as it exhibits flame retardancy of V0 or more at gross wire 960 ° C, UL 94. is not. Next, examples of the matrix resin used for the backup layer 6a-2 include polyolefin, polyacetyl, polyamide, aromatic polyamide, aromatic polyester, aromatic polyether, aromatic polysulfone, and copolymers thereof. Thermoplastic resins or thermosetting resins such as epoxy resins, unsaturated polyester resins, phenolic resins, melamine resins, urea resins, and aryl resins are preferred, but thermoplastic resins are preferred from the viewpoint of moldability. It is more preferable to use an aromatic polyamide which is excellent in heat resistance and impact resistance and has good compatibility with the resin of the arc-receiving layer 6a-1.

In the embodiment as shown in FIG. 5, the production of the arc-extinguishing insulating material formed of the arc-receiving layer 6a-1 and the backup layer 6a-2 is performed by a known two-color molding by injection molding. can do. The present invention is not limited to this production method, and the arc-receiving layer 6a-1 and the ark-up layer 6a-2 may be formed and then bonded together with an adhesive or the like. Example

Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited thereto. In the following examples, “%” means “% by weight” unless otherwise specified. Example 1

The non-halogen flame-retardant resin of Example 1 was obtained by filling matrix resin nylon 66 with 10% cyanomamelamine as a flame retardant with respect to the matrix resin. Specifically, a predetermined amount of DSM: melapur MC was mixed in advance with Toyobo: T-662 resin pellets and kneaded with a twin-screw extruder. Flame retardancy was evaluated by cutting out injection molded 1,6 mm thick flat plates into various test specimen shapes. Also cut off The performance was evaluated by using an injection molding method for an arc-extinguishing insulating material having the shape shown in Fig. 4 and having a thickness of 1.6 thighs for a simulation test of an actual machine.

Flame retardancy test is based on UL94, UL746: HWI (Hot wire ignitability test), IEC707: GW I (Grow-wire-one test). The evaluation was performed using a Suga Test Machine Co., Ltd.), an HWI ignitability test machine (manufactured by Suga Test Machine Co., Ltd.) and a GWI flammability test machine (manufactured by Suga Test Machine Co., Ltd.)

In the breaking performance test, a circuit breaker simulating the actual machine was prototyped and the following overload test and short-circuit test were performed.

Overload test: A current of 6 times the rated current (for example, 60 OA for a 10 OA circuit breaker) is applied to the circuit breaker including the arc extinguishing device with the above configuration, and the movable contact 2 and the fixed contact 3 are turned on. This test is passed when the contacts are separated at a contact separation distance L (distance between movable contact 2 and fixed contact 3) of 25 strokes, and the arc current is successfully interrupted the specified number of times (12 times).

Short-circuit test: In the ON state, an excess current of 50 KA is applied at a voltage of 230 to 690 V to open the movable contact, an arc current is generated, and the arc current is cut off a specified number of times (three times). This test passes if there is no damage and no damage (specifically, no loss of the housing).

The test conditions assume a 100 to 25 OAF class circuit breaker.Overload test 1 is 3-phase 720 V / 600 A, overload test 2 is 3-phase 720 V / 1050 A, and overload test 3 is 3 Evaluated at phase 720V / 150 OA. Short-circuit test 1 was evaluated at three-phase 500 V / 30 KA, short-circuit test 2 at 500 V / 50 KA, and short-circuit test 3 at 440 V / 65 KA.

Table 1 shows the results of the evaluation of the resin composition, the flame retardancy, and the barrier performance. The overload test showed the number of successful breaks and the short circuit test showed the number of successful breaks and whether there was any damage.

As a result, the flame retardancy was UL94 V0, HWI index 4, and GWI 960. C and both passed. The breaking performance of the overload tests 1, 2, and 3 cleared the specified number of breaks of 12 times, and the short-circuit tests 1 and 2 cleared the specified number of breaks of three times, but succeeded in the short-circuit test 3. The number of interruptions was two, and a part of the housing was cracked. In this short-circuit test 3, the arc energy was large and was lost due to the arc wind pressure. Part of the arc-extinguishing member is entrained in the arc field, which increases the amount of pyrolysis gas generated and destroys the housing.In the third short-circuit test, the arc-extinguishing member is broken by the second short-circuit interruption, causing an arc. It is considered that the circuit could not be cut off because it was not possible to generate the pyrolysis gas just to blow off the current.In order to apply it to a high-rated circuit breaker with severe cut-off conditions using the resin composition of Example 1, In other words, in order to clear short-circuit test 3, the gap distance between the normal line of the fixed contact and the movable contact, which are the core of the arc, and the surface to be arced of the arc-extinguishing member must be increased (the It is considered necessary to reinforce the arc extinguishing member so that it does not break due to the arc wind pressure. Examples 2 to 5

In Examples 2 to 5, the type of matrix resin was changed, and a reinforcing resin and a bite resin containing no flame retardant were used. Resin pellets, test pieces, etc. were prepared in the same manner as in Example 1 except for the type of matrix resin, and the flame retardancy and blocking performance were evaluated. Table 1 shows the test results.

The matrix resin used in Example 2 was nylon 6 (manufactured by Toyobo: T-803), Example 3 was nylon 46 (manufactured by DJEP: Suga Neil TS-300), and Example 6 was nylon 6 T (Toyobo). Spinning: TY-502NZ), Nylon 9T (manufactured by Kuraray) in Example 5 was used. As a result, in Examples 2 and 3, because the neat resin was not filled with the stiffener, either part of the slit member was broken by the arc wind as in Example 1 or the short circuit test 3 Although the number of successful shutdowns is two, both short-circuit tests and overload tests are good. In Examples 4 and 5, the components in the resin contained aromatics, and this was probably due to the carbonization of the surface of the slit member due to repeated blocking. However, both the overload test and the short-circuit test are good. Examples 6 to 9

In Examples 6 and 7, the chopped strand aramide fiber (Tecnora: Tecnola) was used as a reinforcing material and the matrix resin was filled at 5% and 10%, respectively. Examples 8 and 9 were aluminum borate. Iskar (Shikoku Chemicals: Arbolex) is filled with 10% and 15% respectively. These resin pellets are the same as those in Example 1. The evaluation was performed under exactly the same conditions as in Example 1 except that a halogen flame-retardant resin was used as a matrix resin, and a predetermined amount of reinforcing material was added and kneaded from a side feeder of a twin-screw extruder. Table 1 shows the test results.

As a result, all Examples passed the flame retardancy test and the breaking performance test. This is because 10% or less of aramide fibers or 15% or less of boric acid whiskers, which are added as reinforcing materials, do not affect the deterioration of flame retardancy and the impact resistance of arc extinguishing members It is considered that the property was improved. Comparative Examples 1-2

Comparative Examples 1 and 2 used halogen-based brominated polystyrene (Br-PS) as a flame retardant. Comparative Example 1 used matrix resin nylon 66 (Toyobo: Τ-662) and bromine. polystyrene which was filled with 1 0% of antimony trioxide (S b ₂ 0 ₃₎ and (Tosoh one manufactured / frame cut 210R) as 25% and the flame retardant aid, the ratio Comparative examples 2 Comparative example 1 It is 30% filled with glass fiber.

The flame retardant effect of these halogen-based brominated polystyrenes was good, and UL 94 and GW I were also passed in Comparative Example 2 filled with glass fiber.In both Comparative Examples, HW I was an index higher than that of Cyanomelamin 4 to 3. Very good with 2. However, the breaking performance is so bad that there is no one that can be cleared under both the overload test and the short-circuit test in Comparative Example 1 under the same test conditions.In Comparative Example 2, the short-circuit test 3 shows that the short-circuit test 3 Becomes incapable of conducting under less than half of the number of successful request interruptions under all test conditions. This is because in the overload test, the gas generated by exposure to the arc contains bromine, which corrodes the contact metal and causes conduction failure.In the short-circuit test, bromine ions are present in the arc-extinguishing gas, and the arc extinction time It is assumed that the breaking performance became longer and the breaking performance deteriorated due to phenomena such as depletion of the grid of the arc extinguishing device.

Examples 10 to 14

Examples 10 to 14 are examples in which the arc extinguishing member of the embodiment of FIG. 5 was tested. In Examples 10 to 13, as shown in FIG. 5a, the nylon 66 to which the cyanomeramine was added as in Example 1 was used as the arc-receiving layer 6a-1, and the backup layer 6a-2 was as shown in Table 2. It is a molded article having a simple two-layer structure obtained by laminating and molding a non-flammable compound or a halogen flame-retardant resin reinforced with glass fiber. Here, an arc-extinguishing member was produced by a two-color molding method in which an arc-receiving layer having a thickness of 0.8 pixels was first injection-molded, and then a backup layer was injection-molded so that the total thickness became 1.6 cells. Further, in Example 14, as shown in FIG. 5B, a partially penetrating two-layer laminated structure was formed such that a part of the backup layer resin 6a-2 penetrated the surface of the arc-receiving layer 6a-1. And the bonding strength of the backup layer are strengthened. That is, a part of the pack-up layer is formed by penetrating the arc-receiving layer made of a non-halogen flame-retardant resin in a comb-like cross section.

The backup layer resin used in Examples 10 to 14 of each was 1194, which is a commercially available flame-retardant resin that meets the standards for both HW I and GW I for ¥ 0, and Example 10 is glass. 25% Fiber Brom Flame Retardant PA66 (Dupont: Zytel F R50), Example 11 1 Talcum 30% Filled Brom Flame Retardant PA66 (Dupont: Zytel FR70 M30) Example 1 2 is a brominated flame retardant PA 46 made of 20% glass fiber (manufactured by DJEP: SUNEIL TS250F40), and Example 13 is a brominated flame retardant PA 46 made of 45% glass fiber.

In Example 14, the same glass fiber as in Example 10 was used, and bromine flame retardant PA 66 (DuPont: Zitel F R50) of 25% was used in Example 14.

Table 2 shows the evaluation results of the breaking performance of Examples 10 to 14. As a result, both the short-circuit test and the overload test were stipulated because the layer to be arced did not suffer any breakage due to the arc wind in the short-circuit test and the formation of the carbonized layer in the overload test of the backup layer resin was small. The number of successful cutoffs was satisfied and good cutoff performance was obtained.

Here, in Example 14, since the backup layer resin was exposed on a part of the surface of the layer to be arced, there was a concern that the overload breaking performance would deteriorate due to the carbonization of the exposed portion resin. Good results were obtained under any of the overload test conditions, probably because the creep resistance of the resin part of the arc-receiving layer was maintained because only the layers were scattered, and a conduction path to the fixed contact was not formed through the creepage of the arc-extinguishing member. Was done. Here, the two-color molding method was used for joining the arc-receiving layer and the back-up layer from the viewpoint of mass productivity, but it is not limited to this molding method. Absent.

Molded insulating material for arc extinction Overload breaking performance Short-circuit breaking performance Pack-up layer 過 Overload test 1 Overload test 2 Overload test 3 Short-circuit test 1 Short-circuit test 2 Short-circuit test 3 Example No.

Fat Successes Successes Successes Breaks Breaks Breaks / breaks Breaks / breaks

PA66 / Br

Example 10 # 66 / cyan melamine 12

(Glass fiber 12 3 / None 3Z No 3 No

2596) Simple double layer 12

PA66 / Br

Example 1 1 ΡΑ66 / cyan melamine 12 12 3

(Talc 30%) Simple double layer 12 None 3 No 3 / None

PA46 / Br

Example 1 2 ΡΑ66 / cyan melamine (glass fiber 12 12 12 3 /

20%) Simple two-layer None 3No None 3 / None

PA46 / Br

Example 1 3 ΡΑ66 / cyan melamine 12 3 None 3 None 3 None

(45% glass fiber) Simple double layer 12 12

Example 14 4 66 / cyan melamine PA66 / Br

(Glass fiber 25W) Partially penetrating two layers 12 12 12 3 No 3 No 3 3 / None

The effects of the present invention are described below.

1) According to the first circuit breaker of the present invention, a fixed contact having a fixed contact fixed to a conductor, a movable contact having a movable contact fixed to and separated from the fixed contact, and a movable contact A circuit breaker comprising: an opening / closing mechanism for rotating a child; an arc extinguishing device for extinguishing an arc generated when the fixed contact and the movable contact come and go; and a housing for accommodating them. The arc-extinguishing device is provided with an arc-extinguishing member so as to cover the entire surface of the fixed contact, and the arc-extinguishing member includes an arc-extinguishing insulating material molded body mainly containing a non-halogen flame-retardant resin. As a result, it is possible to secure the flame retardancy by suppressing poor conduction due to corrosion and contamination of the electrode contacts, or to reduce the mechanical strength and insulation deterioration, and to improve the breaking performance such as overload breaking and short-circuit breaking. .

2) According to the second circuit breaker of the present invention, since the arc-extinguishing insulating material molded article contains a triazine-based organic compound as a flame retardant, the flame-retardant gas can be ensured and the arc-extinguishing gas can be suppressed. In addition, since it does not contain a phosphorus compound having high metal corrosion, such as a contact, or silicon or a metal oxide that causes a contact failure, overload breaking performance can be further improved, and the arc extinguishing device can be downsized.

3) According to the third circuit breaker of the present invention, since the matrix resin of the arc-extinguishing insulating material molded body is polyamide, deterioration of insulation due to carbonization of the surface of the arc-extinguishing insulating material molded body is reduced. Controlled overload rejection performance can be further improved.

4) According to the fourth circuit breaker of the present invention, the arc-extinguishing insulating material molded product is formed by using a non-aromatic polyamide as the matrix resin as the matrix resin of the arc-extinguishing insulating material molded product. Deterioration of insulation due to carbonization of the body surface is further controlled, and the overload rejection performance can be further improved, and the arc extinguishing device can be downsized.

5) According to the fifth circuit breaker of the present invention, the non-halogen flame-retardant resin contains 10% by weight or less of organic fibers based on the non-halogen flame-retardant resin, and the non-halogen flame retardant. Impact resistance of the arc-extinguishing member without impairing flame resistance by containing at least one filler selected from the group consisting of 15% by weight or less of ceramic wiping force based on the conductive resin And the short circuit breaking performance can be improved.

6) According to the sixth circuit breaker of the present invention, the arc-extinguishing member is formed of a laminate of an arc-receiving layer exposed to an arc and a backup layer supporting the arc-receiving layer. The arc-receiving layer is formed of an arc-extinguishing insulating material formed mainly of a non-halogen flame-retardant resin, and the back-up layer is formed of a group consisting of glass fibers, inorganic minerals, and ceramic fibers. By using a flame-retardant resin containing at least one selected material, flame retardancy can be ensured, and the impact resistance of the arc-extinguishing member can be improved, thereby further improving short-circuit breaking performance.

7) According to the seventh circuit breaker of the present invention, since a part of the backup layer penetrates the arc-receiving layer at a plurality of locations, the joining of the arc-receiving layer and the backup layer of the arc-extinguishing member is achieved. It becomes strong and further improves short-circuit breaking performance.

Claims

The scope of the claims

1. A fixed contact in which a fixed contact is fixed to a conductor; a movable contact in which a movable contact that comes into contact with and separates from the fixed contact is fixed; an opening / closing mechanism for rotating the movable contact; A circuit breaker having an arc extinguishing device for extinguishing an arc generated when the movable contact and the movable contact are separated from each other, and a housing accommodating them. An arc extinguishing member is provided so as to cover the arc extinguishing member, and the arc extinguishing member includes an arc extinguishing insulating material formed mainly of a non-halogen flame-retardant resin.

2. The circuit breaker according to claim 1, wherein the arc-extinguishing insulating material molded product contains a triazine-based organic compound as a flame retardant.

3. The circuit breaker according to claim 1, wherein the matrix resin of the arc-extinguishing insulating material molded body is a polyamide.

4. The circuit breaker according to claim 3, wherein the polyamide, which is a matrix resin of the arc-extinguishing insulating material molded body, is a non-aromatic polyamide.

5. The non-halogen flame-retardant resin contains 10% by weight or less of organic fibers based on the non-halogen flame-retardant resin, and the ceramic whisker contains 15% by weight or less based on the non-halogen flame-retardant resin. 2. The circuit breaker according to claim 1, wherein the circuit breaker contains one or more fillers selected from the group consisting of:

6. The arc-extinguishing member is composed of a laminate of an arc-exposed layer exposed to an arc and a backup layer supporting the arc-exposed layer, wherein the arc-exposed layer is mainly composed of a non-halogen flame-retardant resin. An arc-extinguishing insulating material molded body, and the backup layer is made of a flame-retardant resin containing at least one selected from the group consisting of glass fibers, inorganic minerals, and ceramic fibers. The circuit breaker according to item 1 of the above.

7. The circuit breaker according to claim 6, wherein a part of the backup layer penetrates a plurality of arc-receiving layers.