Static trip unit for molded case circuit breakers
AssigneeGeneral Electric Company
InventorsEric W. Bayer, Edward A. Palmisano
Life of this patent
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Abstract
A static trip unit is comprised of a current transformer module and an electronic programmer module physically and electrically mated together for incorporation in a molded case industrial circuit breaker. Current transformer modules and programmer modules are separately interchangeable to change breaker current ratings and functional capabilities. A trip interlock is included to prevent breaker closure in the absence of either the trip unit or the trip solenoid.
Claims14
A multi-pole solid state trip unit structured to be replaceably mounted within the molded case of a multi-pole industrial circuit breaker, said solid state trip unit comprising, in combination:
- A. a first module including
- (1) a first support structure
- (2) a separate current transformer sub-assembly for each breaker pole secured to said first support structure and including a load strap for serial electrical connection in its associated breaker pole circuit, a magnetic core embracing said load strap, and a multi-turn secondary winding wound about said core, and
- (3) a plurality of first electrical connectors carried by said first module and to which the terminations of all of said secondary windings are separately electrically connected;
- and
- B. a second module including
- (1) a second support structure
- (2) a circuit board mounted by said support structure and, in turn, mounting electronic signal processing circuitry, and
- (3) a plurality of second electrical connectors electrically connected with said signal processing circuitry and supported by said second module and individually mating with said first connectors and thus electrically connecting said secondary windings into said signal processing circuitry.
Dependencies are inferred from the claim text.