Motor Protection U-EK230E EX, Systemair

U-EK 230E is a thermistor motor cover to be used in conjunction with a contactor to protect Ex-fans, can also be used for fans with built-in thermistor. It is designed as an electronics unit designed to be snap-mounted on a 35 mm DIN rail. I The fan motors have six series-connected thermistors, two per phase winding, whose resistance is affected by the temperature. When the motor temperature exceeds the permissible temperature, the resistance rises steeply and the motor protection triggers. When the motor cover has tripped, the indicator lamp labeled "Interference" lights up. Resetting is done manually, either by pressing the "Reset" button, or by turning the motor cover off (switching the supply to A2) for about 10 seconds. If a five-stage transformer is used to control the EX fan, the U-EK 230E must be connected to the transformer.