Circuit interrupter with digital trip unit and automatic reset

Details Circuit interrupter with digital trip unit and automatic reset Circuit interrupter with digital trip unit and automatic reset

H - Electricity

02

H

348/26

H02H 3/093 (2006.01) G06F 1/24 (2006.01) G06F 1/30 (2006.01) H02H 1/06 (2006.01)

Patent

CA 1169535

66 49,049 ABSTRACT OF THE DISCLOSURE A circuit interrupter includes a microprocessor based trip unit having a plurality of output control lines and a power supply for providing operating power to said trip unit. Interlock means are provided to maintain the output control lines in a predetermined inactive status for a predetermined time period following energization of the power supply to allow time for operating power to rise to a level sufficient to enable the microcomputer to assert positive control over the status of the control lines. An automatic reset circuit is provided to reset the microcomputer program counter to an initialization routine unless a pulse pattern produced by proper execu- tion of the microcomputer instructions is received by the automatic reset circuitry.

374724

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