ABB 83SR04C-E New PLC process control board

Description

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The starter is designed to:
– start motors;
– ensure continuous functioning of motors;
– disconnect motors from the supply line;
– guarantee protection of motors against working overloads.
The starter is typically made up of a switching device (contactor) and an overload
protection device (thermal release).
The two devices must be coordinated with equipment capable of providing
protection against short-circuit (typically a circuit breaker with magnetic release
only), which is not necessarily part of the starter.
The characteristics of the starter must comply with the international Standard
IEC 60947-4-1, which defines the above as follows:
Contactor: a mechanical switching device having only one position of rest,
operated otherwise than by hand, capable of making, carrying and breaking
currents under normal circuit conditions including operating overload conditions.
Thermal release: thermal overload relay or release which operates in the case
of overload and also in case of loss of phase.
Circuit-breaker: defined by IEC 60947-2 as a mechanical switching device,
capable of making, carrying and breaking currents under normal circuit
conditions and also making, carrying for a specified time and breaking currents
under specified abnormal circuit conditions