Type of equipment :
Transformer or autotransformer (with or without galvanic isolation) one-phase, voltage step-down or step-up.

Uses :
Source of power, requiring an electrical connection to an earth terminal (metal encapsulation).

Comments :
Sturdy,  compact, massive, usable in an industrial environment.
Also exists in class II (double insulation, does not require an electrical connection to earth).

Dimensions :
According to the power For example L x H x D (excluding cable): 130 x 110 x 140 mm

Weight :
From 300 g to 4 Kg