Three Phase Pressure Switch No40
Three phase NE-MA pressure switch. Range adjustable cut out pressure 6 to 12 bar. Differential pressure 2 bar. Cut in range 4 to 10 bar.
It is suitable to be used on three phase air compressors up to 7.5 kW (10hp.) Airpower recommend not to use it on larger than 5.5kW (7.5hp.) compressors.
The pressure switch has a mechanical valve, to release the compressed air between the compressor pistons and the non-return valve, when it switch off. This allows the unit to restart without any back pressure.
When the switch release the air continuous, after it switched off, it is the non-return valve not sealing the air from the tank and the problem is with the non-return valve seat.
What is a compressor pressure switch?
A compressor pressure switch is a safety device that monitors the operation of an air compressor. It is designed to protect the compressor from overheating and damaging itself in case it malfunctions. The sensor on this device is what tells the indoor blower motor when to turn off and on based upon monitoring changes in pressure; if the pressure rises too high, or drops too low, then the sensor sends a signal to cut power to the motor.
Refrigerated air dryers from 750 liters/min up to 6500 liter/min ex-stock. Larger ex overseas. Dew point 4°C under pressure. Automatic drain pre and manual drain after filters.
Screw compressors have no valves or other mechanical forces to cause imbalances unlike piston compressors.
Airpower keeps universal spare parts for compressors. Pressure switches, non return valves and safety valves are universal to all compressors. Bottom entry filters/ regulators, electric motors and starters can be used for many makes of compressors.