CN1255834C

CN1255834C - Circuit breaker

Info

Publication number: CN1255834C
Application number: CN 03145899
Authority: CN
Inventors: 吉原育广; 川上兼弘; 细贝节夫
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2002-11-13
Filing date: 2003-07-14
Publication date: 2006-05-10
Anticipated expiration: 2023-07-14
Also published as: EP1420431B1; CN1501417A; JP4090850B2; JP2004165022A; EP1420431A1; DE60308622T2; DE60308622D1

Abstract

A circuit breaker in which a breaker case (1) is composed of a base (1a) and a cover (1b) and that is formed by accommodating one of unitized automatic tripping devices in a unit housing portion (28) of the base (1a). An electronic automatic tripping unit (32C), a thermal electromagnetic automatic tripping unit (32B), and an earth-leakage detection type automatic tripping unit (32A) have outer structures of the same shape from which a trip portion (32c), terminal conductors (32a), and movable-contact-side conductors (32b) are exposed. An overcurrent tripping element (33), a leakage detection ZCT (34), an amplification circuit (35) for amplifying an output of the leakage detection ZCT (34), and an earth-leakage tripping electromagnet portion (36) that operates on the basis of an output of the amplification circuit (35) are accommodated in the outer structure of the earth-leakage detection type automatic tripping unit (32A). Thus a circuit breaker capable of being used by swapping a leakage tripping unit for an electronic and a thermomotive electromagnetic tripping unit is obtained.

Description

Circuit breaker

Technical field

The present invention relates to have the circuit breaker of Componentized trip free device.

Background technology

In traditional circuit breaker, it is trip free device is made assembly respectively according to modes such as electronic type, the moving electromagnetic types of heat and to constitute that a kind of structure is arranged, simultaneously this each assembly is made same shape, in the breaker housing, be provided with the components containing portion (for example, with reference to No. 2583491 communiques of Japanese Patent Laid) that to take in above-mentioned each assembly.

In traditional circuit breaker, automatic tripping assembly has only electronic type and the moving electromagnetic type of heat, though this dual mode can be exchanged, owing to be not the detection of electrical leakage formula, therefore must make the circuit breaker with leakage tripping device in addition again.Again, the problem that exists in traditional automatic tripping assembly is that not have in the assembly of same profile can be the space that overcurrent trip element, detection of electrical leakage are taken in fully with ZCT, amplification loop, leakage tripping electromagnet portion with the member key element of leakage tripping mechanism.

In order to solve the above problems, the object of the invention is, even a kind of circuit breaker that also can exchange the automatic tripping assembly of detection of electrical leakage formula is provided.

Summary of the invention

Circuit breaker of the present invention, constitute the breaker housing by base and lid, with the trip free device modularization of described breaker and be accommodated in the recess of described base, it is characterized in that, no matter described automatic tripping assembly is the electronic type automatic tripping assembly, the moving electromagnetic type automatic tripping assembly of heat, or detection of electrical leakage formula automatic tripping assembly, all has the trip portion of making, the identical shaped shell that terminal conductor and movable contact shoe side conductor expose, described shell is made of unitized substructure and the module cover in the described recess of packing into, unitized substructure is by constituting near the switching mechanism wing base of described circuit breaker switching mechanism side with away from the terminals side base of described switching mechanism, module cover is positioned at the top of this base and stretches out from described base in order to cover the described terminal conductor that exposes, and takes near the detection of electrical leakage ZCT that is positioned at the described circuit breaker switching mechanism in the described shell of the automatic tripping assembly of detection of electrical leakage formula, be positioned at the overcurrent trip element of the opposition side of described switching mechanism with ZCT with respect to described detection of electrical leakage, be located on the substrate and increase described detection of electrical leakage amplification loop with the output of ZCT, and the leakage tripping electromagnet portion of moving according to the output in this amplification loop.

In sum, adopt the present invention, because trip free device has been formed assembly in every way, and each assembly made same shape, the trip free device of each mode can be exchanged, therefore, compare with traditional leakage tripping mode, its effect is not need to make other breaker, makes a kind of breaker and gets final product.

Again, adopt the present invention, because the part of breaker lid is arranged in the automatic tripping assembly, in automatic tripping assembly, be provided with new space, in narrow space, can accommodate overcurrent trip element, detection of electrical leakage with ZCT, amplification loop, electromagnetism trip electromagnet portion, therefore have the effect that to make the leakage tripping assembly.Again, adopted unitized substructure has been carried out the assembling of device as cutting apart structure, can effectively utilize the space in the shell.

Description of drawings

Fig. 1 is the front view of the circuit breaker of the expression embodiment of the invention 1.

Fig. 2 amplifies the cutaway view of expression slightly for the section along the II-II line of Fig. 1.

Fig. 3 is the end view of the leakage tripping assembly of expression embodiment 1.

Fig. 4 is the vertical view of the leakage tripping assembly of expression embodiment 1.

Fig. 5 is the stereogram of the leakage tripping assembly of expression embodiment 1.

Fig. 6 is the internal structural map of the leakage tripping mechanism of expression embodiment 1.

Fig. 7 uses the configuration stereogram of ZCT and Primary Conductor for the detection of electrical leakage of the leakage tripping assembly of explanation embodiment 1.

Fig. 8 is the key diagram of the part section of the electromagnetic type trip portion of the leakage tripping assembly of expression embodiment 1.

Fig. 9 is the figure that wants portion of the moving electromagnetic type tripping operation of the heat of expression embodiment 1 assembly.

Figure 10 is the figure that wants portion of the electronic type tripping operation assembly of expression embodiment 1.

Figure 11 is the end view of the leakage tripping assembly of the circuit breaker of the expression embodiment of the invention 2.

Figure 12 is the figure of the shell of the leakage tripping assembly of expression embodiment 2.

Figure 13 is the figure of the detection of electrical leakage in the leakage tripping assembly of explanation embodiment 2 with ZCT and amplification loop relation.

Embodiment

Embodiment 1

The following describes embodiments of the invention 1.Fig. 1 implements the front view of the circuit breaker of the embodiment 1 that the present invention uses for expression, the expression state after the assembly taking-up that will trip.And dot the conductor position of after the tripping operation assembly is installed, stretching out from the tripping operation assembly.The cutaway view that Fig. 2 amplifies slightly for the section along the II-II line of Fig. 1, Fig. 3 is the end view of leakage tripping assembly.Fig. 4 and Fig. 5 are the vertical view and the stereogram of the leakage tripping assembly of Fig. 3.Fig. 6 is the figure of the internal mechanism of explanation leakage tripping assembly.Fig. 7 uses the allocation plan of ZCT (ZCT=zero phase current transformer) and Primary Conductor for the detection of electrical leakage of explanation leakage tripping assembly.Fig. 8 is the key diagram of the part section of the electromagnetic type trip portion of expression leakage tripping assembly.Fig. 9 is the figure that wants portion of the moving electromagnetic type tripping operation of expression heat assembly.Figure 10 is the figure that wants portion of expression electronic type tripping operation assembly.For convenience of explanation, the shell of above-mentioned each assembly is represented with chain-dotted line.

Among Fig. 1 and Fig. 2, the breaker housing 1 that synthetic resin is formed is made of base 1a and lid 1b.On the fixed conductor 2 of the mains side that is fixed in base 1a, fixing fixed contact 3.But on mover 7, fixing the subtend shape and fixed contact 3 carries out from the travelling contact 6 that connects.But mover 7 is connected with bonding conductor 9 by flexible conductor (shunt) 8, and this bonding conductor 9 is used for being connected with the some of automatic tripping assembly 32A, 32B, 32C.But contact arm 10 keeps mover 7, is formed the 1st contact support arm 10a that is connected with switching mechanism described later and will mover 7 by the 1st pin 11 turns round the 2nd of support freely and contact support arm 10b but cut apart.

On the fulcrum 12 of contact arm 10, supporting the 1st contact support arm 10a to contact support arm 10b with the 2nd respectively with freely rotating.Cross bar 13 contacts support arm 10a and links with the 1st of each utmost point.The 1st contact support arm 10a is provided with guide hole 14, the 2 contact support arm 10b that open and close the direction extension and is provided with along the slotted hole 15 of guide hole 14 crisscross extensions.Extension spring 17 is set between the 1st pin 11 and the 2nd pin 16, to crossing the 2nd pin 16 application of forces of guide hole 14 and slotted hole 15 engagings.But contact with the 2nd at mover 7 and to be provided with crimp spring 18 between the support arm 10b.

But the lever 19 of breaker opens and closes mover 7 by switching mechanism 20.The switching mechanism 20 of breaker is made of rocking arm 20a, upper links 20b, lower link 20c etc.Rocking arm 20a is that swing at the center with gyroaxis 21.Lower link 20c is provided with the connecting pin 22 that is connected usefulness with the 1st contact support arm 10a.Breaker housing 1 is provided with the explosion chamber 23 of eliminating electric arc.

Base 1a is provided with components containing portion 28, and this components containing portion 28 is made of the some recesses that can accommodate among tripping operation assembly 32A, 32B, the 32C.The display surface 29 of each

assembly

32A, 32B, 32C exposes.The roof pressure of the hook portion 30 that engages with the rocking arm 20a of switching mechanism 20 by the trip portion 32c of each

assembly

32A, 32B, 32C moves to be operated.As Fig. 3, Fig. 9, shown in Figure 10, by in advance the shell of detection of electrical leakage formula shown in Figure 3 tripping operation assembly 32A, the moving electromagnetic type assembly 32B of heat shown in Figure 9, electronic type tripping operation assembly 32C shown in Figure 10 being made same shape, so can exchange.

As shown in Figure 2, each

assembly

32A, 32B, 32C are embedded in the components containing portion 28 of base 1a, under the state that is connected with conductor 9 (common user mode) shown in Figure 2, in case inflow overcurrent, then

assembly

32A, 32B or 32C action, trip portion 32c stretches out, and just can operate hook portion 30.Again, trip portion 32c is the center with axle 41, by helical spring 41a (Fig. 3, Fig. 6) application of force all the time in the counterclockwise direction.

In Fig. 3, Fig. 9 and Figure 10, leakage tripping assembly 32A shown in Figure 3 be a kind of terminal conductor 32a that constitutes fixed conductor 2, shunting bonding conductor 32b and trip portion 32c from the shape that package shell stretches out, be described in detail later.The moving electromagnetic type tripping operation of heat shown in Figure 9 assembly 32B is a kind of terminal conductor 32a, the shunting bonding conductor 32b of fixation side conductor and shape that trip portion 32c stretches out from package shell of forming.Electronic type tripping operation assembly 32C shown in Figure 10 is the shape that a kind of terminal conductor 32a, shunting bonding conductor 32b and trip portion 32c stretch out from package shell.From the side of Fig. 3, Fig. 9, Figure 10, the shell of leakage tripping assembly 32A, the moving electromagnetic type tripping operation of heat assembly 32B, electronic type tripping operation assembly 32C is the same shape that is of bonding.

[leakage tripping assembly]

Below with reference to Fig. 3, Fig. 4, Fig. 5, be the shell of example explanation tripping operation assembly with leakage tripping assembly 32A.Leakage tripping assembly 32A is made of unitized substructure 32f in the components containing portion 28 of packing into and the module cover 32d that is configured in this unitized substructure 32f top (Fig. 3).Module cover 32d is formed the same width of cloth 32d1 of portion of same width roughly and is constituted (with reference to Fig. 5) to the protuberance 32d2 that stretches out away from blocking portion side by the length direction of breaker and unitized substructure 32f, sees from the side to be of bonding.Thus, when making up in assembly 32A plug-in package incorporating section 28, protuberance 32d2 is with the top covering of terminal conductor 32a.

Electromagnetism tripping operation action and detection of electrical leakage when the bimetallic tripping operation assembly action when taking place in order to carry out overcurrent, overcurrent generation are moved with the electromagnetism tripping operation of ZCT, and leakage tripping assembly 32A must have the key element of carrying out above three kinds of actions.

As Fig. 3, shown in Figure 7, the inside of the shell that constitutes at unitized substructure 32f and module cover 32d by leakage tripping assembly 32A mainly is partly to take in detection of electrical leakage ZCT34 at unitized substructure 32f.Between terminal conductor 32a and shunting bonding conductor 32b 3 Primary Conductor 37 of part mutually runs through the hollow hole of this detection of electrical leakage with ZCT34, and detection of electrical leakage is with the orthogonal thereto configuration of length direction of interarea (end face of hollow circuit cylinder) and the circuit breaker of ZCT34.Lead to the output line 34a of the detection of electrical leakage usefulness ZCT34 that is connected with the substrate in amplification loop 35 with the side of ZCT34 in detection of electrical leakage.

Primary Conductor 37 both can be made of the formed products that terminal conductor 32a, middle conductor 37a, shunting bonding conductor 32b is bent to 1 piece of tabular conductor, also can constitute by joints such as welding, the screw thread of a plurality of tabular conductors are fixing.Shunting bonding conductor 9 these addresses, owing to be to be illustrated with the example of shunt 8 as circuit breaker, therefore, also the conductor with switching mechanism 20 sides of Primary Conductor 37 is called branch current conductor 32b, normally is called movable contact shoe side conductor.

As Fig. 3, shown in Figure 7, the inside of the shell that constitutes at unitized substructure 32f and module cover 32d by leakage tripping assembly 32A, mainly be module cover 32d partly accommodating bimetallic 33 tops protuberance 39 and relay trip(ping) bar 38, also have highdensity electromagnet portion 36.Electromagnet portion 36 is configured in a side of bimetallic assortment direction, is made of electromagnet, plunger, control loop and fixed head that these members are installed.Consider that from the stroke equal angles of plunger electromagnet portion 36 is elongated shape normally, and, because pushing relay trip(ping) bar 38 needs energetically, must accommodate big coil and make shape become big.Therefore, preferably the part of electromagnet portion 36 is housed among the module cover 32d that stretches out shape.

With reference to Fig. 3, amplification loop 35 is used to increase from the electric signal of detection of electrical leakage with ZCT34 output, its loop substrate is configured in detection of electrical leakage with the side of ZCT34, is pressed into to be fixed on the rib that is arranged at unitized substructure 32f inwall, and its inner edge detection of electrical leakage and is configured with the periphery of ZCT34.As mentioned above, be used to be set in the module cover 32d from the electromagnet portion 36 of the output signal start in amplification loop 35, the control loop of electromagnet portion 36 and the part of fixed head thereof are arranged in space 32d2.

With reference to Fig. 3, Fig. 6, Fig. 8, the overcurrent trip element more particularly is that bimetallic 33 is fixed on the Primary Conductor 37 by riveted joint, and formation and detection of electrical leakage are the roughly parallel shape of interarea with the end face of ZCT34.Front end at bimetallic 33 is provided with the microcall threaded portion, and the protuberance 39 that docks with relay trip(ping) bar 38 is inserted in the described threaded portion by screw-type.Again, fixed head 46 is formed by Primary Conductor 37, unitized substructure 32f and nonmagnetic metal (alloy of stainless steel, aluminium and these materials thereof etc.), and the yoke 42 of this fixed head 46 and コ word shape is fastening by hold-down screw 46b.The electromagnetism trip portion is made of yoke 42, anchor 43, spring 45 and fixed head 46.

Anchor 43 is laminated by a plurality of conductive plates (magnetic sheet), and the anchor 43 roughly parallel shapes of interarea and all-moving surface and detection of electrical leakage usefulness ZCT34 own dispose.Anchor 43 can gyroaxis 43a (bearing is arranged at fixed head 46) for swinging at the center, utilize to open extension that frame ends 43c of portion and fixed head 46 in the extension of anchor 43 and end spring 45 between the 46a of portion, with gyroaxis 43a is that the center is all the time towards the counter clockwise direction application of force of Fig. 8, dock with the retainer 46c that is arranged at fixed head 46, swing is limited.

The leading section 43b of anchor 43 is connected with trip(ping) bar 44, is fixed on the relay trip(ping) bar 38 by hold-down screw 38a (Fig. 6) by trip(ping) bar 44.Anchor 43 is made of a plurality of conductive plates, therefore, can be processed into slim conductive plate respectively, is convenient to hole processing and punch process, and the fixing hole, end 43b, the extension that form gyroaxis 43a easily end the 43c of portion etc.

In case the plunger of bimetallic 33, trip(ping) bar 44, electromagnet portion 36 applies power to relay trip(ping) bar 38, then relay trip(ping) bar 38 is towards the clockwise direction swing of Fig. 6, will with the disengagement that engages of trip portion 32c, trip portion 32c swings towards the counter clockwise direction of Fig. 6.Relay trip(ping) bar 38 is bearing in unitized substructure 32f by pin 40 by axle and goes up (among Fig. 3, this is to be supported on module cover 32d because pin 40 looks by axle, but the cause of the overlapping lower part to protuberance 39 of module cover 32d and unitized substructure 32f).Again, relay trip(ping) bar 38 utilizes not shown helical spring, with pin 40 be the center all the time towards (Fig. 3, Fig. 6) application of force counterclockwise, its part is docked with the not shown retainer that is arranged at unitized substructure 32f and position among the maintenance figure.

The tripping operation action of leakage tripping assembly is described below with reference to Fig. 3, Fig. 6, Fig. 8.At first the tripping operation that overcurrent is detected is that bimetallic tripping operation action and electromagnetism tripping operation action describe, and the tripping operation action to detection of electrical leakage describes then.

(the bimetallic tripping operation when overcurrent takes place)

When overcurrent takes place in Primary Conductor 37, bimetallic 33 (Fig. 6) is towards the right bending, be arranged at the protuberance 39 pushing relay trip(ping) bars 38 of bimetallic 33 front ends, relay trip(ping) bar 38 with pin 40 be the center toward the clockwise direction (Fig. 6) turn round, thus, the disengagement that engages of relay trip(ping) bar 38 and trip portion 32c, trip portion 32c is that axle 41 carries out (Fig. 6) revolution counterclockwise as the center with the swing fulcrum of trip portion 32c, makes the tripping operation of breaker body by roof pressure hook portion 30 (Fig. 2).

(the electromagnetism tripping operation when overcurrent takes place)

When overcurrent had surpassed a certain limit (electric current is greater than the tripping operation action of bimetallic 33), the yoke 42 that surrounds Primary Conductor 37 had magnetic, and attracting anchor 43 to produce with gyroaxis 43a is clockwise direction (Fig. 8) swing at center.Thus, the trip(ping) bar 44 that links with anchor 43 (Fig. 8) downwards moves, relay trip(ping) bar 38 with pin 40 as fulcrum (Fig. 6) revolution toward the clockwise direction, the same with the tripping operation of bimetallic 33, make the tripping operation of breaker body.

(the detection of electrical leakage tripping operation of ZCT)

In load side, in case electric leakage takes place and flows into Zero-phase current to Primary Conductor 37 with ZCT34 from detection of electrical leakage, then this Zero-phase current is by detection of electrical leakage ZCT34 pick-up, amplify by amplification loop 35, the same with the overcurrent trip action, the plunger pushing relay trip(ping) bar 38 of electric leakage inspection trip electromagnet portion 36 makes the tripping operation of breaker body.

[the moving electromagnetism tripping operation of heat assembly]

The following describes the moving electromagnetic assembly 32B of heat.With reference to Fig. 9, in being configured in unitized substructure 32f and be located at terminal conductor 32a and divide on the middle conductor 37b between the current conductor 32b and bimetallic 50 and yoke 51 are riveted into one with rivet 52.The section of yoke 51 is コ word shape, and the opening of the peristome of コ word shape is positioned at the reverse side (anchor 53 sides) with switching mechanism 20.Again, because of middle conductor 37b does not need to connect detection of electrical leakage ZCT, so if (Fig. 1) sees linearly (occasion of electronic type tripping operation assembly 32C too) above circuit breaker.

Relay trip(ping) bar 38 is provided with from pin 40 extension 38b downwards.When carrying out electromagnetism tripping operation action by anchor 53, the yoke subtend 53a of portion of anchor 53 is attracted by yoke 51, anchor 53 is that the center is towards swing counterclockwise with gyroaxis 54, relay trip(ping) bar leading section 53b docks with the extension 38b of relay trip(ping) bar 38, and relay trip(ping) bar 38 is that the clockwise direction swing is carried out at the center with axle 40.Then, the same with above-mentioned explanation, make circuit breaker trip.In addition, anchor 53 utilize not shown spring with gyroaxis 54 as the center application of force toward the clockwise direction all the time.The tripping operation action of bimetallic 33 modes among the tripping operation action of bimetallic 50 and the leakage tripping assembly 32A is identical.

[electronic type tripping operation assembly]

The following describes electronic type tripping operation assembly 32C.With reference to Figure 10, be configured in the unitized substructure 32f and be located at terminal conductor 32a and divide the middle conductor 37c between the current conductor 32b to be provided with the CT56 that current detecting is used, the output line 57 of CT56 is connected with amplification loop 58, makes 59 actions of electromagnet portion according to the output in amplification loop 58.In case the generation overcurrent, electromagnet portion 59 action, to moving, (Fig. 2) docks the plunger 59a of electromagnet portion 59 that an end is provided with trip portion 32c with hook portion 30, makes circuit breaker trip towards the left of Figure 10.

As mentioned above, as Fig. 3, Fig. 9, shown in Figure 10, if in advance leakage tripping assembly 32A, the moving electromagnetic type tripping operation assembly 32B of heat and electronic type tripping operation assembly 32C are made same shape, then each

assembly

32A, 32B, 32C can be housed in the components containing portion 28 of breaker housing 1 as shown in Figure 1 and Figure 2 convertibly.

Owing to be provided with the wider space 32e of the module cover 32d2 that extends to the top of the terminal conductor 32a of load side (Fig. 2, Fig. 3), therefore, as shown in Figure 3, can utilize space 32e to take in leakage tripping electromagnet portion 36 again.

Again, owing to will be incorporated in the shell of

tripping operation assembly

32A, 32B, 32C in the reverse side of relative hook 30 more in the past than the electromagnet portion 36 that the detection of electrical leakage of linking up with 30 more close switching mechanism 20 sides configurations is used with switching mechanism 20, therefore, electromagnet portion 36 can not be exposed in 3,6 arcing gass that produced of contact that when blocking take place, and can reduce the phenomenon that electromagnet portion 36 is failure to actuate after the electric arc extinguishing arc.

Again, because with the length direction quadrature shape configuration of detection of electrical leakage with interarea and the circuit breaker of ZCT34, and bimetallic 33 and electromagnetism trip portion (yoke 42, anchor 43) be configured in than detection of electrical leakage with the more close terminal conductor 32a of ZCT34 side, therefore, when switching mechanism 20 side openings of unitized substructure 32f, can prevent that electric arc from directly penetrating cruelly to the electromagnetism trip portion.

Again, be preferably the position that Primary Conductor 37 is made Splittable or be provided with the sectional area stenosis, will to bimetallic 33 effectively near the heater portions of the heating usefulness occasion that be arranged in assembly housing 32A, the 32B and end outside subtend the bimetallic 33 can heating be dispelled the heat outside circuit breaker.In this occasion and since will support the metallic fixed head 46 of anchor 43 be configured in bimetallic 33 near, therefore, adopting resinous occasion to compare with fixed head 46 can easier heat radiation, and can utilize small space securely anchor 43 to be fixed.

Again, because with the length direction quadrature shape configuration of detection of electrical leakage with interarea and the circuit breaker of ZCT34, and with the interarea and the all-moving surface thereof of the face of the コ word shape of bimetallic 33 and interarea and yoke 42, tabular anchor 43, roughly be configured in detection of electrical leakage respectively with on the interarea of ZCT34 parallel shape, therefore, can shorten the circuit breaker length direction of leakage tripping assembly 32A.

Embodiment 2

The following describes embodiments of the invention 2.

Figure 11 is the end view of the leakage tripping assembly of the circuit breaker of the expression embodiment of the invention 2, and Figure 12 is the figure of the shell of the leakage tripping assembly of expression Figure 11, and Figure 13 is the figure of the electric leakage in the leakage tripping assembly of explanation Figure 11 with ZCT and amplification loop 35 relations.For convenience of explanation, omitted the diagram of bimetallic and electromagnetism trip portion, other structure is identical with embodiment 1, its explanation of Therefore, omited.

As Figure 11, shown in Figure 12, unitized substructure 32f is made of 2 switching mechanism wing base 32f1 of cutting apart and terminals side base 32f2 on the length direction of circuit breaker.During the leakage tripping of packing into assembly 32A, with Primary Conductor 37, bimetallic 33, electromagnetism trip portion (yoke 42, anchor 43 etc.), detection of electrical leakage with among the terminals side base 32f2 that pack into such as ZCT34, amplification loop 35, electromagnet portion 36, relay trip(ping) bar 38.Be fixed on the terminals side base 32f2 with the switching wing base 32f1 of not shown screw then, again module cover 32d be fixed on the unitized substructure 32f switching mechanism 20 sides.

Amplification loop 35 among the embodiment 2 is that its inner edge detection of electrical leakage is configured in detection of electrical leakage usefulness ZCT34 with the periphery of ZCT34 side.When Primary Conductor 37 when being one-piece type, with detection of electrical leakage with ZCT34 from the top downwards (Figure 13) pack into the load side base 32f2.When Primary Conductor 37 is Splittable, after load side base 32f2 that detection of electrical leakage is packed into ZCT34, in front of the paper to the inside (Figure 13) the amplification loop 35 of packing into.

As mentioned above,, therefore the inner edge in amplification loop 35 can detection of electrical leakage and take in, can closely assemble, and can improve the leak tightness of shell with the periphery of ZCT34 because the shell of leakage tripping assembly 32A is made 3 members.

Claims

1. circuit breaker, constitute breaker housing (1) by base (1a) and lid (1b), trip free device (32A with described breaker, 32B, 32C) modularization and being accommodated in the recess (28) of described base, it is characterized in that, no matter described automatic tripping assembly is electronic type (32C) automatic tripping assembly, moving electromagnetic type (32B) automatic tripping assembly of heat, or detection of electrical leakage formula (32A) automatic tripping assembly, all has the trip portion of making (32c), the identical shaped shell that terminal conductor (32a) and movable contact shoe side conductor (32b) expose, described shell is made of unitized substructure (32f) in the described recess (28) of packing into and module cover (32d), unitized substructure (32f) is by constituting near the switching mechanism wing base (32f1) of described circuit breaker switching mechanism side with away from the terminals side base (32f2) of described switching mechanism, module cover (32d) is positioned at the top of this base and stretches out from described base in order to cover the described terminal conductor that exposes, and takes near be positioned at the described circuit breaker switching mechanism detection of electrical leakage with ZCT (34) in the described shell of the automatic tripping assembly (32A) of detection of electrical leakage formula, be positioned at the overcurrent trip element (33) of the opposition side of described switching mechanism with ZCT with respect to described detection of electrical leakage, be located on the substrate and increase described detection of electrical leakage amplification loop (35) with the output of ZCT, and the leakage tripping electromagnet portion (36) of moving according to the output in this amplification loop (35).

2. circuit breaker as claimed in claim 1, it is characterized in that, described module cover (32d) is positioned at the top of described this unitized substructure (32f), and, the part of described leakage tripping electromagnet portion (36) is taken at the extension of described module cover (32d) towards stretching out further from the direction of described circuit breaker switching mechanism than described unitized substructure (32f).

3. circuit breaker as claimed in claim 1 is characterized in that, described substrate is used the periphery setting of ZCT (34) along this detection of electrical leakage with the interarea direction of ZCT (34) in described detection of electrical leakage.

4. circuit breaker as claimed in claim 1, it is characterized in that, in the shell of described assembly, described detection of electrical leakage is configured in ZCT (34) on the direction of length direction quadrature of its interarea and described breaker terminal conductor (32a), be configured to described detection of electrical leakage with the interarea of ZCT (34) parallel with bimetallic (33) overcurrent trip, and the depth direction to the recess (28) of described base (1a) extends, and with the trip yoke (42) of usefulness and disposed with the interarea of ZCT (34) is parallel by the all-moving surface of the anchor of its adhesive (43) and described detection of electrical leakage of electromagnetism.

5. circuit breaker as claimed in claim 4 is characterized in that, with the anchor (43) or the support/fixedly fixed head (46) and the configuration of described shell subtend shape of the metal formation of the nonmagnetic material of yoke (42) of described electromagnetic trip device.