Title:
CIRCUIT BREAKER
Document Type and Number:
Japanese Patent JP3628783
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a simple and low-cost means for measuring current flowing through a circuit breaker with thermo-magnetic trip means.
SOLUTION: A voltage applied to a bimetal 19 is utilized for detecting a load current. The voltage signal for indicating current flowing to the bimetal is used as an input signal to a failure detector 25. The signal is converted into a di/dt signal, whose bandwidth is limited and a circuit breaker is tripped, when the level of di/dt signal exceeds a threshold which indicates an arc occurrence for a specific number of times within a specified time interval.
Inventors:
Stephen Albert Murena
Raymond Warren Mackenzie
David M Wood
Raymond Warren Mackenzie
David M Wood
Application Number:
JP31469395A
Publication Date:
March 16, 2005
Filing Date:
November 07, 1995
Export Citation:
Assignee:
EATON CORPORATION
International Classes:
H01H73/48; H02H1/00; H02H3/08; G01R19/165; H02H5/04; (IPC1-7): H02H3/08; H01H73/48
Domestic Patent References:
| JP6260075A | ||||
| JP3103022A | ||||
| JP417638U |
Foreign References:
| US4857054 | ||||
| US5224006 |
Attorney, Agent or Firm:
Koichiro Kato
Tetsuro Maki
Kimio Kikutani
Tetsuro Maki
Kimio Kikutani