The scenario
A three-phase compressor motor is controlled via a DOL starter with a pressure switch. The motor runs when system pressure is low, stopped by the pressure switch or emergency stop.
What is in this drawing
Read the decisions behind it.
01
Three-phase supply with main fuses
02
Contactor with three main contacts and auxiliary holding contact
03
Overload relay with thermal elements and NC control contact
04
Pressure switch NC in series with control circuit
05
Start/stop pushbuttons with holding circuit
Suitable for small to medium three-phase motors in compressor systems where pressure-based on/off control is required, providing simple and reliable starter design.
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