GB624581A - Improvements in automatic circuit breakers having thermal overload release units - Google Patents

Improvements in automatic circuit breakers having thermal overload release units

Info

Publication number
GB624581A
GB624581A GB4915/47A GB491547A GB624581A GB 624581 A GB624581 A GB 624581A GB 4915/47 A GB4915/47 A GB 4915/47A GB 491547 A GB491547 A GB 491547A GB 624581 A GB624581 A GB 624581A
Authority
GB
United Kingdom
Prior art keywords
bar
arm
overload
unbalanced
channel
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
GB4915/47A
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.)
JA Crabtree and Co Ltd
Original Assignee
JA Crabtree and Co Ltd
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 JA Crabtree and Co Ltd filed Critical JA Crabtree and Co Ltd
Priority to GB4915/47A priority Critical patent/GB624581A/en
Priority to GB28121/48A priority patent/GB634701A/en
Priority to US7688A priority patent/US2527907A/en
Publication of GB624581A publication Critical patent/GB624581A/en
Expired legal-status Critical Current

Links

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
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • 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
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H01H71/7445—Poly-phase adjustment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective 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
    • H01H83/22—Protective 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
    • H01H83/223—Protective 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

Landscapes

  • Breakers (AREA)

Abstract

624,581. Automatic - circuit breakers. CRABTREE & CO., Ltd., J. A., BESAG, E., HILL, W. E., and WINTLE, T. D. G. Feb. 19, 1947, Nos. 4915 and 22588. [Class 38(v)] A polyphase motor protection switch with a differential thermal trip comprises a number of bimetal elements such as those described in Specification 624,599, each having one end d<SP>1</SP> engaging between a wall f of the casing and a nose e on a channel-section bar a and the other end d<SP>2</SP> attached to a pivoted lever arm d which engages in a slot b<SP>1</SP> in a bar b sliding within the channel section bar a. On balanced overload, the trip arm h initially holds the bar a so that the bar b is moved to the left until it engages an adjustable stop k which may be a bimetal strip to compensate for ambient temperature such as that described in Specification 624,598, after which continued expansion of the bimetal elements d<SP>2</SP> moves the bar a to operate the trip arm. On unbalanced overload, the bar b is held by the lever d of the underloaded element, and bar a is moved instantly by the arm d' of the overload element to operate the trip arm. In another embodirrient with non-differential tripping, Fig. 5, (not shown), the channel bar is used as an adjustable setting stop for the arms d<SP>1</SP> and the wall f is cut away so that the arm d<SP>1</SP> of the unloaded element is carried forward on unbalanced overload; the delay being the same for balanced and unbalanced loads.
GB4915/47A 1947-02-19 1947-02-19 Improvements in automatic circuit breakers having thermal overload release units Expired GB624581A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB4915/47A GB624581A (en) 1947-02-19 1947-02-19 Improvements in automatic circuit breakers having thermal overload release units
GB28121/48A GB634701A (en) 1947-02-19 1948-01-27 Improvements in automatic electric circuit breakers having thermal overload release units
US7688A US2527907A (en) 1947-02-19 1948-02-11 Automatic circuit breaker having thermal overload release units

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4915/47A GB624581A (en) 1947-02-19 1947-02-19 Improvements in automatic circuit breakers having thermal overload release units

Publications (1)

Publication Number Publication Date
GB624581A true GB624581A (en) 1949-06-13

Family

ID=9786251

Family Applications (2)

Application Number Title Priority Date Filing Date
GB4915/47A Expired GB624581A (en) 1947-02-19 1947-02-19 Improvements in automatic circuit breakers having thermal overload release units
GB28121/48A Expired GB634701A (en) 1947-02-19 1948-01-27 Improvements in automatic electric circuit breakers having thermal overload release units

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB28121/48A Expired GB634701A (en) 1947-02-19 1948-01-27 Improvements in automatic electric circuit breakers having thermal overload release units

Country Status (2)

Country Link
US (1) US2527907A (en)
GB (2) GB624581A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872548A (en) * 1955-12-01 1959-02-03 Fed Pacific Electric Co Motor starters

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668205A (en) * 1951-10-31 1954-02-02 Ite Circuit Breaker Ltd Multipole circuit breaker
AT404647B (en) * 1996-02-26 1999-01-25 Felten & Guilleaume Ag Oester ELECTRIC CIRCUIT BREAKER

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1031836A (en) * 1911-06-05 1912-07-09 Willys Overland Co Safety-lock for relatively reciprocal members.
BE443183A (en) * 1937-08-20
NL60534C (en) * 1938-04-26
US2289108A (en) * 1940-11-15 1942-07-07 Micro Switch Corp Electric switch construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872548A (en) * 1955-12-01 1959-02-03 Fed Pacific Electric Co Motor starters

Also Published As

Publication number Publication date
US2527907A (en) 1950-10-31
GB634701A (en) 1950-03-29

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