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Thermal Relays 17...25A, SGC1-D25..32

		Motor Protection — general It is very important to choose an adequate protective device for the safety of the motor during operation and for its durability. The efficiency of protection methods varies according to the application. There is no general rule and we are available to advise you for special applications and especially in the case of difficult starting. An economic and effective protection are thermal overload relays with protection against: Overload Phase failure imbalance Phase loss Function Thermal overload relays are 3 pole. The motor current flows through their bimetals (1 per phase) which are indirectly heated. Under the effect of the heating, the bimetals bend, cause the relay to trip and the position of the auxiliary contacts to change. The relay setting range is graduated in amps. In compliance with international and national standards, the setting current is the motor nominal current and not the tripping current (no tripping at 1.05 x setting current, tripping at 1.2 x setting current). The relays are built to be self protecting in the event of an overload until the short circuit protection device is activated. SGR2-D series of thermal relay can be used in the circuit of 50Hz or 60Hz, rated insulation voltage 660V, rated current 0.1-630A for protecting the phase break when the electric motor is overload. The relay has different mechanism and temperature compensation & can be plugged in SGC1-D series AC contactor. It is very advanced thermal relay in the world.