The module (1) has a front panel (6) with a series of projecting cooling ribs or dissipating the generated waste heat and an associated resilient plastics hand grip (10). The latter has a finger hole and a pivot pin fitting into a corresponding bore (9) in one of the cooling ribs (7), allowing the handgrip (10) to pivot from a stationary position in which it lies between two adjacent cooling ribs (7) and a working position in which it projects out from them. Pref. the handgrip has an approximately egg shaped contour with the finger hole at the larger dia. end and the pivot pin at the opposite end.
