PROTECTION APPARATUS FOR AN ELECTRICAL LOAD

PROTECTION APPARATUS FOR AN ELECTRICAL LOAD

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: KILBURN, JEFFREY, A
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
RELAYS
SELECTORS
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Beschreibung
Zusammenfassung: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.