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US 4,786,885 AGranted
Molded case circuit breaker shunt trip unit
AssigneeGeneral Electric Company
InventorsRobert A. Morris, Paul T. Rajotte, Alan J. Messerli
Life of this patent
Estimating the term…
Abstract
An integrated protection unit is a circuit breaker which includes basic overcurrent protection facility along with selective electrical accessories. A molded plastic accessory access cover secured to the integrated protection unit cover protects the accessory components contained within the circuit breaker cover from the environment. A shunt trip unit is one such accessory component which can be field-installed without affecting the integrity of the circuit breaker overcurrent protection components.
Claims15
A molded case circuit breaker and shunt trip unit comprising:
- a circuit breaker case and cover;
- an operating mechanism within said case and arranged for separating a pair of contacts connecting between line and load terminals arranged on said case;
- an accessory cover mounted on said circuit breaker cover;
- a shunt trip coil within a recess in said circuit breaker cover and arranged for interacting with said operating mechanism to separate said contacts upon receipt of an electric signal;
- an electric switch and circuit within an enclosure contained in a separate recess within said circuit breaker cover and accessible through said accessory cover;
- an operating lever within said enclosure and extending within said circuit breaker case, said operating lever being arranged against a plunger on said switch when said contacts are closed and being away from said switch when said contacts are open, said electric signal being transmitted to said coil when said operating lever is against said plunger and said electric signal being interrupted to said coil when said lever is away from plunger.
3 more elements
Dependencies are inferred from the claim text.