EP1244128B1 - Lastschalter - Google Patents

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Publication number
EP1244128B1
EP1244128B1 EP20010120748 EP01120748A EP1244128B1 EP 1244128 B1 EP1244128 B1 EP 1244128B1 EP 20010120748 EP20010120748 EP 20010120748 EP 01120748 A EP01120748 A EP 01120748A EP 1244128 B1 EP1244128 B1 EP 1244128B1
Authority
EP
European Patent Office
Prior art keywords
nylon
circuit breaker
flame retardant
molded article
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20010120748
Other languages
English (en)
French (fr)
Other versions
EP1244128A2 (de
EP1244128A3 (de
Inventor
Shunichi Katsube
Kazunori Fukuya
Michihiro Hayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP1244128A2 publication Critical patent/EP1244128A2/de
Publication of EP1244128A3 publication Critical patent/EP1244128A3/de
Application granted granted Critical
Publication of EP1244128B1 publication Critical patent/EP1244128B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/025—Constructional details of housings or casings not concerning the mounting or assembly of the different internal parts
    • H01H71/0257—Strength considerations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00

Definitions

  • Circuit breakers using molded articles of thermoplastic resins have been recently proposed, since these materials permit molding of minute portions.
  • Japanese Patent Application Laid-open No. 8-171831 discloses a molded article containing nylon 6 and nylon 66 as base resins, such as a molded article containing 35-39 wt% of nylon 6, 8-12 wt% of nylon 66, 1-3 wt% of nylon MXD6, 7-9 wt% of an ethylene/ ⁇ -olefin copolymer, and 40-45 wt% of a reinforcement.
  • This molded article comprises specific proportions of the elastomer and other components and is therefore suitable as a cover for a circuit breaker with a high breaking capacity, which is resistant to rapidly increasing internal pressure of a housing upon interruption.
  • Blooming means that glass fiber and other reinforcements, halogen-based flame retardants, antimony-based flame retardant aids, and elastomers bloom out to the surface of a molded article, and the molded article appears white. Blooming particularly deteriorates the appearance of a molded article of a dark color such as black, and does not significantly deteriorate the appearance of a molded article of a light color such as white.
  • overcurrent trip device 7 When the circuit is energized and an overcurrent greater than or equal to a predetermined level occurs, overcurrent trip device 7 actuates trip bar 9 to rotate in the clockwise direction in Fig. 2. The rotation of trip bar 9 unlatches the latch engagement between trip bar 9 and switching mechanism unit 6, and switching mechanism unit 6 actuates movable contact assembly 3 to move in such a direction as to separate the movable contact from the stationary contact (this operation is generally referred to as "tripping"). In the tripping, an arc is generated between the stationary contact and movable contact depending on the magnitude of the overcurrent. This arc permits the periphery of the two contacts and inside the housing to generated decomposed gases, and the pressure inside the housing rises suddenly. The risen pressure impacts cover 1 and base 2 constituting the housing.
  • the housing is a molded article comprising, for example, a crystalline polyamide resin, an amorphous polyamide resin, an elastomer, a reinforcement, a flame retardant, and a coloring agent for black coloring.
  • the housing is a molded article comprising 15-35 wt% of at least one of nylon 66, nylon 6 and nylon 46, a blend or a copolymer thereof as the crystalline polyamide resin, 2-12 wt% of nylon 6T and/or nylon 6I or a copolymer thereof as the amorphous polyamide resin, 3-10 wt% of an ethylene/ ⁇ -olefin copolymer or an ionomer of a polyolefin copolymer as the elastomer, 30-55 wt% of a glass fiber or a ceramic fiber as the reinforcement, 12-20 wt% of a halogen-based flame retardant (e.g., polybromostyrene) and an antimony-based flame retardant aid (
  • nylon 6 and nylon 66 or the use of nylon 6 alone as the crystalline polyamide slows down the rate of crystallization of the resin and invites less blooming, and is preferred specifically as cover 1, since the appearance of cover 1 imparts a strong impression to a viewer, as compared with the use of nylon 66 alone or the combined use of nylon 6 and nylon 66, respectively.
  • the use of nylon 66 and/or nylon 46 as the crystalline polyamide yields a high melting point with satisfactory momentary heat resistance and is preferable as base 2.
  • nylon 66 and nylon 6 are less than 15 wt%, kneading and molding of the compound is difficult, and if it exceeds 35 wt%, the compositional ratios of the flame retardant, reinforcement and elastomer are relatively decreased and the resulting molded article is low in flame retardancy, strength, or impact resistance.
  • the compositional ratio of nylon 66 is 18-22 wt%, the resulting molded article is superior in flame retardancy, heat resistance and strength.
  • the molded article has deteriorated strength, and if it exceeds 55 wt%, the molded article readily invites blooming, and the kneading and molding of the compound becomes difficult. Additionally, the compositional ratios of the flame retardant, reinforcement and elastomer are relatively decreased and the resulting molded article is low in flame retardancy or impact resistance.
  • the molded article has insufficient flame retardancy, and, in contrast, if it exceeds 20 wt%, the molded article readily invites blooming and the compositional ratios of the reinforcement and elastomer are relatively decreased and the molded article has deteriorated strength or impact resistance.
  • the present inventors have found a suitable composition for the housing of a circuit breaker as a result of the following tests.
  • compositional ratio of carbon black was as small as 0.3 wt%, and it is indicated as being included in the compositional ratio of nylon 66.
  • Sample 01 comprised 20 wt% of nylon 66, 9 wt% of nylon 6, 4 wt% of nylon 6T, 42 wt% of glass fiber, 13 wt% of polybromostyrene, 4 wt% of antimony trioxide, and 8 wt% of ethylene/ ⁇ -olefin copolymer.
  • Sample 02 comprised 20 wt% of nylon 66, 8 wt% of nylon 6T, 2 wt% of nylon 6I, 42 wt% of glass fiber, 16 wt% of polybromostyrene, 4 wt% of antimony trioxide, and 8 wt% of ethylene/ ⁇ -olefin copolymer.
  • Sample 03 comprised 18 wt% of nylon 66, 6 wt% of nylon 6, 5 wt% of nylon 6t, 55 wt% of glass fiber, 10 wt% of polybromostyrene, 3 wt% of antimony trioxide, and 3 wt% of ethylene/ ⁇ -olefin copolymer.
  • Comparative Example 1 had a composition according to the conventional molded article described in Japanese Patent Application Laid-open No. 8-171831 and comprised nylon 66, nylon 6, nylon MXD6, a glass fiber and an elastomer.
  • Comparative Example 2 had a composition according to the molded article described in Japanese Patent Application laid-open No. 6-299068 and comprised nylon 66, nylon 6, nylon 6T, a glass fiber, and clay of inorganic mineral.
  • Comparative Example 3 had a composition according to the molded article described in Japanese Patent Application Laid-open No. 6-299068 and comprised nylon 66, nylon 6T and a glass fiber.
  • Comparative Example 4 had a composition according to the present invention, except that no amorphous nylon was contained.
  • This example comprised nylon 66, a glass fiber, an elastomer and a flame retardant.
  • Japanese Patent Application laid-open No. 6-299068 neither discloses nor indicates the use of a black coloring agent, but a small amount of carbon black was added in the same manner as in Samples 01 and 02, for comparison of blooming with Samples 01, 02 and 03 according to Example 1.
  • test specimens and base 2 of housing were molded by kneading a resin compound using a 250-ton molding machine at 280°C and pouring the kneaded resin compound into a mold at 70°C, and cooling the poured resin compound for 80 seconds.
  • the test was performed according to IEC 60695-2-1/2 Standard.
  • Test specimens 70 mm long x 70 mm wide x 1 mm thick were prepared, and the test was performed using a glow wire ignition tester (a product of Suga Test Instruments) with a 960°C glow wire tip temperature. In this procedure, a test specimen was accepted when it satisfied both the following two conditions, and was rejected when it did not satisfy any of the two conditions.
  • a glow wire ignition tester a product of Suga Test Instruments
  • Condition 1 When the tip of the glow wire is pressed to a sample specimen for 30 seconds, and then separated therefrom, the flame or glow of the test specimen extinguishes within 30 seconds.
  • a circuit breaker was assembled using base 2 (90 mm wide, 130 mm long, and 35 mm high) of a circuit breaker of a 100-ampere frame, and the circuit breaker was twice subjected to a short-circuit breaking test at AC 460 V and 25 kA. After this procedure, the test specimen was accepted when base 2 did not crack.
  • the external blooming was quantitatively evaluated by color difference of the appearance of base 2 of the circuit breaker.
  • Base 2 of a circuit breaker of a 100-ampere frame was used as a test sample.
  • the color at six points of the test sample including three points at each of the side not shown in the figure of base 2 on the power-supply side and of the side 2b (refer to Fig. 2) on the load side was determined using an S&M Color Computer SM-4 (a product of Suga Test Instruments) under the condition of two optical paths and of mask diameter of 10.
  • a reference sample was prepared by molding a composition mainly containing a thermosetting resin (25 wt% of an unsaturated polyester, 56 wt% of aluminum hydroxide, 18.7 wt% of a glass fiber, and 0.3 wt% of carbon black) in a mold for base 2 for a 100-ampere frame.
  • the color of the reference sample was determined at six points including three points at each of the side on the power supply side and of side 2b on the load side in the same manner as in the test sample.
  • This reference sample mainly contained a thermosetting resin and had a luster surface and exhibited extremely low blooming.
  • test sample was accepted when the color difference between the mean of measurement values at six points of the reference sample and the mean of measurement values at six points of the test sample was equal to or less than 8.5, and it was rejected when the color difference exceeded 8.5.
  • This criteria corresponds to the criteria of visual inspection of the appearance of base 2 of the circuit breaker, in which a test sample is accepted when the area of mottled blooming region is equal to or less than about 5% of the total area.
  • Samples 01, 02 and 03 were satisfactory in flame retardancy, impact resistance, strength and blooming properties and were suitable as housings of circuit breakers.
  • Sample 02 was somewhat superior to Sample 01 in heat resistance, and was suitable as base 2.
  • Sample 01 was somewhat superior to Sample 03 in blooming property, and was suitable as cover 1.
  • Sample 03 was satisfactory in creep resistance, and was suitable as base 2 of a circuit breaker on which high stress acts at high temperatures.
  • Comparative Example 1 was low in flame retardancy, Comparative Examples 2 and 3 were low in flame retardancy and impact resistance, and Comparative Example 4 exhibited blooming-induced mottles on most of its surface and was low in external blooming property. Accordingly, these comparative examples were inferior to Samples 01, 02 and 03 as the housings of circuit breakers. Table 2 Flame Retardancy Impact Resistance Blooming Comparative Example 1 rejected accepted accepted Comparative Example 2 rejected rejected accepted Comparative Example 3 rejected rejected accepted Comparative Example 4 accepted accepted rejected 01 accepted accepted accepted accepted accepted 02 accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted accepted 03 accepted accepted accepted accepted accepted accepted accepted accepted accepted
  • the circuit breaker according to the present invention includes a movable contact assembly (3) having a movable contact, which movable contact is arranged opposite to a stationary contact; a switching mechanism unit (6) which opens and closes the movable contact assembly (3); and a housing (1,2) which houses the movable contact assembly (3) and switching mechanism unit (6), and the switching mechanism unit (6) is actuated upon detection of an overcurrent or leakage current to thereby separate the contacts from each other, in which at least a part of the housing is a molded article of a compound comprising a crystalline polyamide resin, an amorphous polyamide resin, an elastomer, a reinforcement, a flame retardant, and a coloring agent for black coloring.
  • the invention therefore can provide a circuit breaker having a housing which is satisfactory in impact resistance and can be applied to breaking of circuits of high breaking capacities, and is excellent in flame retardancy and strength properties and exhibits less mottled blooming.
  • the circuit breaker is satisfactory in impact resistance, as well as in flame retardancy, strength and blooming properties.
  • the crystalline polyamide is at least one of nylon 66 and nylon 6 or a copolymer compound thereof
  • the amorphous polyamide is at least one of nylon 6T and nylon 6I or a copolymer compound thereof
  • the reinforcement is a glass fiber
  • the flame retardant is a mixture of a halogen-based flame retardant and an antimony-based flame retardant aid
  • the circuit breaker is satisfactory in impact resistance, as well as in flame retardancy, strength and blooming properties.
  • the circuit breaker is satisfactory in heat resistance.
  • the part of the housing is a base constituting the housing
  • the resulting circuit breaker is satisfactory in impact resistance, as well as in flame retardancy, strength and blooming properties, with a high level of safety.

Landscapes

  • Compositions Of Macromolecular Compounds (AREA)
  • Organic Insulating Materials (AREA)
  • Reinforced Plastic Materials (AREA)
  • Breakers (AREA)

Claims (5)

  1. Stromkreisunterbrecher, umfassend eine bewegliche Kontaktanordnung (3), welche einen beweglichen Kontakt trägt, wobei der bewegliche Kontakt gegenüber einem stationären Kontakt angeordnet ist; eine Schaltermechanismuseinheit (6), die diese bewegliche Kontaktanordnung öffnet und schließt; und ein Gehäuse (1,2), in welchem diese bewegliche Kontaktanordnung (3) und Schaltermechanismuseinheit (6) untergebracht sind, wobei mindestens ein Teil des Gehäuses (1,2) ein Formkörper ist, der ein kristallines Polyamidharz, ein amorphes Polyamidharz, ein Elastomer und eine Verstärkung umfasst, gekennzeichnet durch einen Flammenhemmer und ein Färbemittel für Schwarzfärbung, und wobei die Schaltermechanismuseinheit (6) durch die Detektion eines Überstroms oder eines Leckstroms betätigt wird, um dadurch die Kontakte von einander zu trennen.
  2. Stromkreisunterbrecher gemäß Anspruch 1, wobei der Formkörper 15 bis 35 Gewichtsprozent eines kristallinen Polyamidharzes, 2 bis 12 Gewichtsprozent eines amorphen Polyamidharzes, 3 bis 10 Gewichtsprozent eines Elastomers, 30 bis 55 Gewichtsprozent einer Verstärkung und 10 bis 20 Gewichtsprozent eines Flammenhemmers enthält.
  3. Stromkreisunterbrecher gemäß Anspruch 1 oder 2, wobei das kristalline Polyamid mindestens eines aus Nylon 66 und Nylon 6 oder eine Copolymerverbindung davon ist, das amorphe Polyamid mindestens eines aus Nylon 6T und 6I oder eine Copolymerverbindung davon ist, die Verstärkung Glasfasern und der Flammenhemmer eine Mischung aus einem halogen-basierten Flammenhemmer und einem Antimonbasierten Flammenhemmer-Hilfsstoff ist.
  4. Stromkreisunterbrecher gemäß Anspruch 3, wobei das kristalline Polyamid Nylon 66 ist.
  5. Stromkreisunterbrecher gemäß einem der Ansprüche 1 bis 4, wobei der Teil des Gehäuses (1,2) ein Unterteil ist (2), das das Gehäuse (1,2) festlegt.
EP20010120748 2001-03-23 2001-09-06 Lastschalter Expired - Lifetime EP1244128B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001085013 2001-03-23
JP2001085013A JP2002289083A (ja) 2001-03-23 2001-03-23 回路遮断器

Publications (3)

Publication Number Publication Date
EP1244128A2 EP1244128A2 (de) 2002-09-25
EP1244128A3 EP1244128A3 (de) 2004-04-14
EP1244128B1 true EP1244128B1 (de) 2007-07-04

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ID=18940597

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010120748 Expired - Lifetime EP1244128B1 (de) 2001-03-23 2001-09-06 Lastschalter

Country Status (6)

Country Link
EP (1) EP1244128B1 (de)
JP (1) JP2002289083A (de)
CN (1) CN1206689C (de)
DE (1) DE60129201T2 (de)
ES (1) ES2286063T3 (de)
TW (1) TW517258B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4131313A4 (de) * 2020-04-02 2024-04-03 LS Electric Co., Ltd. Lichtbogenlöschanordnung und schutzschalter damit

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10331169A1 (de) * 2003-07-09 2005-02-10 Basf Ag Gehäuseschale für ein elektronisches Gerät
EP2924067A1 (de) * 2014-03-26 2015-09-30 LANXESS Deutschland GmbH Polyamidzusammensetzungen
EP2924065A1 (de) * 2014-03-26 2015-09-30 LANXESS Deutschland GmbH Polyamidzusammensetzungen
EP2924068A1 (de) * 2014-03-26 2015-09-30 LANXESS Deutschland GmbH Polyamidzusammensetzungen
CN106366656B (zh) * 2016-09-26 2018-12-21 五行科技股份有限公司 一种高强度高表观高玻纤增强尼龙材料及其制备方法
CN110506079B (zh) 2017-03-30 2022-03-22 旭化成株式会社 聚酰胺组合物及成型品
JP7023723B2 (ja) * 2018-01-22 2022-02-22 旭化成株式会社 ポリアミド組成物及び成形品

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07103309B2 (ja) * 1987-04-20 1995-11-08 三井石油化学工業株式会社 ポリアミド組成物
US5290835A (en) * 1991-10-01 1994-03-01 Teijin Limited Electrical and electronic parts formed of polybutylene naphthalenedicarboxylate
JP3298340B2 (ja) * 1994-12-16 2002-07-02 三菱電機株式会社 開閉器の絶縁構成物
JP3016344B2 (ja) * 1994-12-19 2000-03-06 三菱電機株式会社 開閉器
JPH1196882A (ja) * 1997-09-19 1999-04-09 Hitachi Ltd 回路遮断器
JP2000204241A (ja) * 1999-01-08 2000-07-25 Ube Ind Ltd ウエルド強度に優れたポリアミド樹脂組成物
EP1083203A1 (de) * 1999-01-18 2001-03-14 Mitsubishi Denki Kabushiki Kaisha Schalter
JP2000248172A (ja) * 1999-02-26 2000-09-12 Unitika Ltd ポリアミド樹脂組成物、これを用いてなるセルフタップ性を有する部品

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4131313A4 (de) * 2020-04-02 2024-04-03 LS Electric Co., Ltd. Lichtbogenlöschanordnung und schutzschalter damit

Also Published As

Publication number Publication date
DE60129201T2 (de) 2008-03-06
JP2002289083A (ja) 2002-10-04
ES2286063T3 (es) 2007-12-01
DE60129201D1 (de) 2007-08-16
TW517258B (en) 2003-01-11
EP1244128A2 (de) 2002-09-25
CN1377054A (zh) 2002-10-30
CN1206689C (zh) 2005-06-15
EP1244128A3 (de) 2004-04-14

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