Pull out fusible switches

Details Pull out fusible switches Pull out fusible switches

1984-03-29

1985-08-20

McQuade, John

Geometrical instruments

337194, 337198, 337201, 337268, 339147R, 339263L, H01R 1368

Patent

active

045360464

ABSTRACT:
Assembly systems for compact N-pole fusible pull out switches of different ratings use the same two part insulator bases and the same insulator pull out heads in all switches. In one system, for switches of a given current rating but two different voltage ratings, there are two types of fixed contacts in the base but the contacts are the same for both voltage ratings; the fuseholder/stab contact members in the head are all the same for both switch ratings, and all mounting hardware and incidental hardware is the same for all switches. The voltage ratings are differentiated from each other only by different base terminals and by different insulator barriers over the base contacts. In another system covering six switch ratings (three different current ratings and two different voltage ratings) the two part insulator bases, the insulator heads, and the base terminals are all the same and all mounting hardware and incidental hardware is the same for all rating combinations; the six different voltage/current ratings are differentiated from each other only by different fixed contacts in the base, by different fuseholder/stab members in the head, and by different insulator barriers. The second system has only three set of fixed contacts each used for two different rating combinations. Both systems preclude misassembly and misapplication in the field. A particularly compact fuseholder/stab construction is provided for high current ratings.

REFERENCES:
patent: Re22266 (1943-02-01), Adam et al.
patent: 2193201 (1940-03-01), Millermaster
patent: 2617847 (1952-11-01), Cole
patent: 3289150 (1966-11-01), Sturdivan
patent: 3599174 (1971-08-01), Dhaliwal
patent: 3996546 (1976-12-01), Hugly

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