The relays are used above all for mobile equipment, e. g. air conditioning compressors, refrigerating containers, building site compressors and cranes.
Function
Application
Phase sequence
Direction of rotation of the drive
Phase failure
A fuse has tripped
Failure of the control supply voltage
Broken cable
Phase asymmetry
Overheating of the motor due to asymmetrical voltage
Detection of asymmetrically loaded networks
Undervoltage
Increased current at a motor with corresponding overheating
Unintentional resetting of a device
Network collapse, particularly with battery power
Overvoltage
Protection of a plant against destruction due to overvoltage
