Locking arrangement for fixing a terminal block

Claim 1

A locking arrangement for locking a terminal block to a supporting channel section, the terminal block having a base including fixing means for fixing the terminal block to two different kinds of supporting channel, namely a first kind having outwardly turned rims and a second kind having inwardly turned rims; the fixing means including a first fixing tab for co-operating with an outwardly turned rim, a second fixing tab for co-operating with an inwardly turned rim, and a third fixing tab for co-operating with either kind of rim, such that the block is fixable to either kind of supporting channel by means of the third fixing tab and the appropriate one of the first and second fixing tabs for the kind of supporting channel in question, each fixing tab including a notch for receiving a rim of at least one kind of supporting channel, and the fixing means as a whole including sufficient resilience for the block to be snap fitted to a supporting channel wherein the locking arrangement comprises guide means on said terminal block and a locking plate disposed in said guide means for movement transversely with respect to a supporting channel section when said channel is fixed in the fixing means, said locking plate having lock notches arranged to reinforce the action of the notches in at least some of the tabs, the guide means being arranged to allow at least one of the lock notches to engage one of the rims of a supporting channel once the terminal block has been snap-fitted thereto.