Molded case circuit interrupter rating plug keying and interlock

Details Molded case circuit interrupter rating plug keying and interlock Molded case circuit interrupter rating plug keying and interlock

1989-02-15

1991-06-25

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Multiple contact type

335202, H01H 6702

Patent

active

050270915

ABSTRACT:
An electronic circuit interrupter includes an electronic trip circuit contained within a circuit interrupter enclosure along with an externally accessible rating plug for setting the ampere rating. The rating plug includes keying tabs that fit within corresponding keying slots formed on the top surface of the electronic circuit interrupter enclosure. Interlock is provided between the rating plug and the electric panelboard which includes a plurality of electronic circuit interrupters connected within an industrial power system. Tabs formed on the side walls of the rating plug are trapped under the panelboard face plate to prevent removal of the rating plug without first removing the panelboard face plate.

REFERENCES:
patent: 3826951 (1974-07-01), Mater et al.
patent: 4081779 (1978-03-01), Ranzaigo
patent: 4181906 (1980-01-01), Matsko et al.
patent: 4622444 (1986-11-01), Kandatsu
patent: 4728914 (1988-03-01), Morris et al.
patent: 4754247 (1988-06-01), Raymont et al.

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