GB446787A - Improvements in electromagnetically-operated switchgear or the like electrical apparatus - Google Patents

Improvements in electromagnetically-operated switchgear or the like electrical apparatus

Info

Publication number
GB446787A
GB446787A GB1318435A GB1318435A GB446787A GB 446787 A GB446787 A GB 446787A GB 1318435 A GB1318435 A GB 1318435A GB 1318435 A GB1318435 A GB 1318435A GB 446787 A GB446787 A GB 446787A
Authority
GB
United Kingdom
Prior art keywords
resistance
casing
whipp
pivoted
supported
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
GB1318435A
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.)
Whipp and Bourne Ltd
Original Assignee
Whipp and Bourne 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 Whipp and Bourne Ltd filed Critical Whipp and Bourne Ltd
Priority to GB1318435A priority Critical patent/GB446787A/en
Publication of GB446787A publication Critical patent/GB446787A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
    • H01H47/10—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current by switching-in or -out impedance external to the relay winding
    • 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
    • H01H9/52—Cooling of switch parts

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Push-Button Switches (AREA)

Abstract

446,787. Electromagnetic switches. WHIPP & BOURNE, Ltd., and WHIPP, F., Switchgear Works, Castleton, near Manchester. May 3, 1935, No. 13184. [Class 38 (v)] In order to prevent the heat from an " economy " resistance used in the maintaining circuit of electromagnetic switches, circuitbreakers, &c. from being conducted to the contacts, brushes, &c. and thereby reducing their efficiency, the sheath or core of the resistance unit, which is insulated from the coil or coils thereof, is mounted in thermal conductivity with the casing of the switch &c. apparatus. As shown in Figs. 1, 3, the resistance, to which current is led through insulating leads 24, is surrounded by a metal covering 20 between which and the resistance material is interposed a wrapping of insulating material 23. The resistance element is arranged to be pressed against the lid 10 of the apparatus by being supported on arms 19 pivoted to bellcranks 14 pivoted on fixed points and having their inner arms 15 pressed apart by a spring 17. Where the dissipation of heat to the casing is rapid a cowl 26 may be supported on pillars 27 whereby a current of air circulates above the casing and prevents accidental contact with the hot cover.
GB1318435A 1935-05-03 1935-05-03 Improvements in electromagnetically-operated switchgear or the like electrical apparatus Expired GB446787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1318435A GB446787A (en) 1935-05-03 1935-05-03 Improvements in electromagnetically-operated switchgear or the like electrical apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1318435A GB446787A (en) 1935-05-03 1935-05-03 Improvements in electromagnetically-operated switchgear or the like electrical apparatus

Publications (1)

Publication Number Publication Date
GB446787A true GB446787A (en) 1936-05-06

Family

ID=10018362

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1318435A Expired GB446787A (en) 1935-05-03 1935-05-03 Improvements in electromagnetically-operated switchgear or the like electrical apparatus

Country Status (1)

Country Link
GB (1) GB446787A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19828754A1 (en) * 1998-06-27 1999-12-30 Abb Daimler Benz Transp Cooling device for brake resistors in locomotive

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19828754A1 (en) * 1998-06-27 1999-12-30 Abb Daimler Benz Transp Cooling device for brake resistors in locomotive

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