Plug for masking switching contacts

Claim 1

A plug for masking the insertion opening access to switching contacts in a terminal strip to prevent inadvertent connection to the contacts, said plug comprising: a body portion; an upper pulling head extending in one direction from said body portion; spring tongue means extending in the opposite direction from said body portion; locking projections on said spring tongue means; extensions on said spring tongue means beneath said locking projections, said extensions being adapted for separating switching contacts in the terminal strip; and a central guiding web extending from said body portion in the same direction as said spring tongue means; said body portion, pulling head, spring tongue means, locking projections and central guiding web all being integrally formed of a unitary piece of electrically insulative material; said body portion being wider than said pulling head or said spring tongue means or said central guiding web so as to fully mask the insertion opening of the terminal strip; said plug being adapted to be mounted to a terminal strip to make externally inaccessible the insertion openings therein and to cover a substantial portion of the lateral surface of the terminal strip in the vicinity of the contact access openings, and when said plug is so mounted to the terminal strip said spring tongue means and said central guiding web enter corresponding openings in the terminal strip, and said locking projections engage corresponding recesses in the terminal strip.