ADJUSTABLE MAGNETIC TRIP ASSEMBLY FOR CIRCUIT BREAKER

An adjustable magnetic trip unit (1) for a circuit breaker includes a torsio n spring (33) which applies a bias force to the plunger (15) of a trip solenoi d (7). The torsion spring (33) is mounted on a driven bevel gear (47) and woun d by an adjustment knob (39) coupled to a driving bevel gear (51)...

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Hauptverfasser: GIBSON, JEFFREY SCOTT, RODGERS, CRAIG ALLEN, LAKE, ERIK STEPHEN
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RODGERS, CRAIG ALLEN
LAKE, ERIK STEPHEN
description An adjustable magnetic trip unit (1) for a circuit breaker includes a torsio n spring (33) which applies a bias force to the plunger (15) of a trip solenoi d (7). The torsion spring (33) is mounted on a driven bevel gear (47) and woun d by an adjustment knob (39) coupled to a driving bevel gear (51) to adjust th e current at which the solenoid (7) is activated. An indexer (37) having peripheral flates (61) which engage a seat (55) in the circuit breaker housi ng (3) provides a pluarlity of discrete positions of the adjustment knob (39). Depressing the adjustment knob (39) against a second spring (59) unseats the indexer (37) for rotation of the adjustment knob between settings. In addition, a slide (71) with an inclined surface (85) bearing against the plunger (15) and coupled to the driven bevel gear (47), provides simultaneou s adjustment of plunger gap (67) with adjustment of the torsion spring force t o increase the range of adjustment.
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language eng ; fre
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subjects BASIC ELECTRIC ELEMENTS
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
RELAYS
SELECTORS
title ADJUSTABLE MAGNETIC TRIP ASSEMBLY FOR CIRCUIT BREAKER
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