Abstract: A supply and protection unit for a hermetic compressor of a thermostatically regulated refrigerator comprising an electrically insulating support body (3) adapted to be fixed to the casing of the compressor (P); said support body being provided with cavities (3a, 3b, 3c, 3d and 3e) opening at one of its faces intended to face towards the compressor for slidably and removably inserting therein of a pair of electrical devices (1, 2) and connection means thereof to be supported against the compressor casing, one of said devices being a thermally operated protection switch (1) and the other being a resistor (2) with a positive temperature coefficient.