US 5,027,091 A · Molded case circuit interrupter rating plug keying and interlock arrangement

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.

Claims5

Dependent claims

An electronic trip circuit interrupter comprising in combination:

a circuit interrupter cover and case;
an electronic trip circuit within said interrupter cover and arranged for interrupting circuit current through separable contacts arranged within said interrupter case;
and
a circuit interrupter cover attached to said interrupter case and containing first recesses formed therein for accepting an actuator-accessory unit and accessories, said circuit interrupter cover further containing a second recess formed therein for accepting a rating plug to set the circuit interrupter ampere rating, said second recess including keying means formed therein to prevent insertion of any said rating plug having an improper rating, said second recess including interlock means formed therein to prevent removal of said rating plug from said second recess when said circuit interrupter is installed within an electrical enclosure.

1 more element

Dependencies are inferred from the claim text.

Molded case circuit interrupter rating plug keying and interlock arrangement

Life of this patent

Molded case circuit interrupter rating plug keying and interlock arrangement

Life of this patent

Abstract

Claims5