Patent Number: 6,310,753

Title: Low impedance magnetic latch tripping scheme

Abstract: A circuit breaker system (100) providing a low impedance magnetic latch tripping scheme. The circuit breaker system (100) includes a trip unit (310) coupled to a switch unit (108). Trip unit (310) is coupled to an electrical circuitry and utilizes a current transformer (114) to sample a current conducting through the electrical circuitry. This current is processed into an input signal (126) suitable as an input to a trip circuitry (316) included in the trip unit (310). When a processor (322) senses an overcurrent condition in the input signal (126), processor (322) transmits a trip signal (128) to a switch (220) to initiate protection against the overcurrent condition, i.e., a trip of the electrical circuitry. Switch (220) permits a low release current to conduct through a low impedance electromechanical interface unit (218) such that the electromechanical interface unit (218) can actuate a mechanical opening mechanism included in the switch unit (108).

Inventors: Dollar, II; Charles Randall (Norcross, GA), Bilac; Mario (Lawrenceville, GA)

Assignee: Siemens Energy & Automation, Inc.

International Classification: H02H 1/00 (20060101); H02H 1/06 (20060101); H02H 003/00 ()

Expiration Date: 10/30/2018