Protection apparatus for an electrical load

Details Protection apparatus for an electrical load Protection apparatus for an electrical load

2005-09-30

2009-02-17

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific circuit breaker or control structure

Reexamination Certificate

active

07492564

ABSTRACT:
The trip unit of a circuit breaker provides overload protection for a contactor used to energize a load such as a motor while still providing conventional protection for the wiring serving the motor. The trip unit of the circuit breaker eliminates the need for a separate overload relay by generating a pre-trip signal that opens the contactor when the circuit breaker I2t long delay function reaches a selected percentage, such as about 85%, of the trip value.

REFERENCES:
patent: 5872722 (1999-02-01), Oravetz et al.
patent: 5901025 (1999-05-01), Takahashi et al.
patent: 6512380 (2003-01-01), Turvey
patent: 03103022 (1991-04-01), None
English Translation of Ishii et al. (JP 3-103022) (Oct. 2007).
Moeller Electric Corporation; Main Catalog USA 2000/2001; Automation/Motor Control Energy Distribution; pp. 7/24-7/25.
Industrial Control Products Main Catalog; Manual Motor Protectors, Magnetic Motor Protector Combinations and Type E Self-protected Combination Starters: Overview—System PKZ 2; pp. 08/025-08/048 and 08/064-08/071; http://www.moellerusa.net/content/catalog—main—USA.shtml.

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