GB1431576A - Thermally responsive electrical device - Google Patents

Thermally responsive electrical device

Info

Publication number
GB1431576A
GB1431576A GB3006773A GB3006773A GB1431576A GB 1431576 A GB1431576 A GB 1431576A GB 3006773 A GB3006773 A GB 3006773A GB 3006773 A GB3006773 A GB 3006773A GB 1431576 A GB1431576 A GB 1431576A
Authority
GB
United Kingdom
Prior art keywords
slide
latch member
latch
bimetallic
lever
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
Application number
GB3006773A
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.)
CBS Corp
Original Assignee
Westinghouse 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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB1431576A publication Critical patent/GB1431576A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
    • H01H83/223Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/14Electrothermal mechanisms
    • H01H71/16Electrothermal mechanisms with bimetal element
    • H01H2071/167Multiple bimetals working in parallel together, e.g. laminated together
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/14Electrothermal mechanisms
    • H01H71/16Electrothermal mechanisms with bimetal element
    • H01H71/162Electrothermal mechanisms with bimetal element with compensation for ambient temperature

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

1431576 Electrically released switches; thermal relays WESTINGHOUSE ELECTRIC CORP 25 June 1973 [29 June 1972] 30067/73 Heading H1N A polyphase thermal overload and phase unbalance relay 10 having a moulded insulating housing 20 with compartments for the operating parts includes an operating mechanism 50 comprising a latch member 66 biased by a spring 94 for an end 90 to overlie and latch a movable contact arm 68 in the operative position shown in Fig. 4 in which a fixed contact 74 is electrically engaged with a movable contact 76 to complete, for example, the energizing circuit of an adjacent line contactor unit 12 (Fig. 1, not shown). The movable contact arm has forked branches 96, 98 on either side of a guide prong 62 and on being unlatched the arm is driven by a spring 72 to open contacts 74, 76 to close contacts 76, 100, which can complete an alarm circuit, and at the same time to drive a reset rod 70 outwards of the housing 20 to provide indication of the tripped condition (Fig. 5, not shown). The latch member 66 is pivotally supported on a portion 84 of a bracket 64 pivoted at 60, which can be set for operating current value by screw and cam means 86, 88 and the latch is released by actuating means comprising bimetallic members 108 with heating elements 106 (detailed in Fig. 8, not shown) associated with each phase acting on a slide assembly 92, Fig. 7, consisting of two slides 144, 146 disposed and movable parallel with one another. Slide 144 has portions 150, 152, 154 disposed directly adjacent the low expansion sides of the bimetallic elements 108 and slide 146 which carries a pivotal lever 148 mounted on a fixed pivot 168 has portions 156, 158, 160 disposed directly adjacent the high expansion sides. The lever 148 has an extension piece 164 engaged by slide 144 and a nose portion 162 remote from the pivot point which directly engages the end of the latch member 66 remote from the latch. Under balanced overload conditions all bimetallic elements 108 flex equally in the same direction and their free ends 142 engage the portions 150, 152, 154 of slide 144 so that the whole slide assembly including the pivotal lever 148 moves together to act on the latch member 66 to displace it to a position 66a (Fig. 6, not shown) and to unlatch the relay contacts. Under unbalanced load conditions the bimetallic elements will not flex equally and as shown in Fig. 7 the end 142a of one element will retain the slide 146 so that slide 144 moves relative thereto to act on the latch member 66 through the pivotal action of lever 148, the speed of the tripping action being stated to be increased in the ratio of distance "a" to distance "b" as compared with the balanced overload condition. One end of the slide 144 is extended through the side of the housing to provide facilities for manual tripping and the latch member 66 may be of bimetallic material for ambient temperature compensation.
GB3006773A 1972-06-29 1973-06-25 Thermally responsive electrical device Expired GB1431576A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US26727272A 1972-06-29 1972-06-29

Publications (1)

Publication Number Publication Date
GB1431576A true GB1431576A (en) 1976-04-07

Family

ID=23018076

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3006773A Expired GB1431576A (en) 1972-06-29 1973-06-25 Thermally responsive electrical device

Country Status (11)

Country Link
US (1) US3792401A (en)
AU (1) AU476175B2 (en)
BE (1) BE801424A (en)
BR (1) BR7304657D0 (en)
CA (1) CA977805A (en)
CH (1) CH570035A5 (en)
DE (2) DE7321781U (en)
ES (1) ES416155A1 (en)
FR (1) FR2191243B1 (en)
GB (1) GB1431576A (en)
ZA (1) ZA734363B (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047140A (en) * 1975-12-23 1977-09-06 Westinghouse Electric Corporation Thermal overload relay
GB1536197A (en) * 1976-02-25 1978-12-20 Cutler Hammer World Trade Inc Electrical overload switching relay
JPS5942927B2 (en) * 1977-12-29 1984-10-18 富士電機株式会社 Thermal overload relay
GB1595046A (en) * 1978-04-25 1981-08-05 Sprecher & Schuh Ag Bimetallic thermo-release
US4270113A (en) * 1979-04-06 1981-05-26 Westinghouse Electric Corp. Thermal overload relay
FR2516300A1 (en) * 1981-11-09 1983-05-13 Telemecanique Electrique DIFFERENTIAL DEVICE FOR A POLYPHASE THERMAL RELAY
US4528539A (en) * 1984-06-28 1985-07-09 Eaton Corporation Reduced-size thermal overload relay
JPH0347242Y2 (en) * 1985-03-26 1991-10-08
DE8619694U1 (en) * 1986-07-23 1986-09-18 Siemens AG, 1000 Berlin und 8000 München Overload relay
DE19727732B4 (en) * 1997-06-30 2009-08-06 Abb Ag Combination switchgear
JP4045709B2 (en) * 1999-04-02 2008-02-13 富士電機機器制御株式会社 Thermal overload trip device for circuit breaker
JP4186414B2 (en) * 2000-11-29 2008-11-26 富士電機機器制御株式会社 Instantaneous trip circuit breaker
JP4186415B2 (en) * 2000-11-30 2008-11-26 富士電機機器制御株式会社 Circuit breaker overload trip device
JP2005222738A (en) * 2004-02-03 2005-08-18 Fuji Electric Fa Components & Systems Co Ltd Overload/open-phase tripping device of circuit breaker
DE102008062527B4 (en) * 2008-12-16 2022-08-11 Abb Schweiz Ag Multi-phase electrical switching device with a trip slide and a trip slide
JP4978681B2 (en) * 2009-10-23 2012-07-18 富士電機機器制御株式会社 Thermal overload relay

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE443183A (en) * 1937-08-20
BE543460A (en) * 1954-12-23
FR1279427A (en) * 1960-11-09 1961-12-22 Normacem Sa Thermal relay for polyphase currents
GB1250773A (en) * 1968-11-23 1971-10-20

Also Published As

Publication number Publication date
ZA734363B (en) 1974-06-26
BE801424A (en) 1973-12-26
FR2191243B1 (en) 1978-07-21
CA977805A (en) 1975-11-11
US3792401A (en) 1974-02-12
DE7321781U (en) 1973-09-13
AU476175B2 (en) 1976-09-16
CH570035A5 (en) 1975-11-28
DE2329642A1 (en) 1974-01-17
ES416155A1 (en) 1976-03-01
FR2191243A1 (en) 1974-02-01
AU5663473A (en) 1974-12-12
BR7304657D0 (en) 1974-08-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee