Description
The thermistor motor protection module is a monitoring module,
which in conjunction with PTC thermistors effectively protects electrical
machines against thermal overload.
The thermistors, which are integrated into the winding overhang by motor
vehicle manufacturers, react with a rise of temperature with exponentially
increasing resistance. On exceeding the threshold values specified in the
technical data, a contactor is operated via the relay output of the MTMS, which
isolates the machine from the supply.
After cooling down, the motor starts automatically. The module works on the
closed-circuit principle, so that the measuring circuit is monitored for open
circuits.
Technical Data
Operating voltage: 220 V / 50-60 Hz ± 10%
Power consumption: approximately 3 VA
Output relay: SPDT with dry contacts
Switching capacity: 250 VAC / 1250 VA
24 VDC / 100 W
Thermistor temperature sensors: 6 max.
Temperature trigger points
Switch-off resistance Roff: 2 kž Roff 4 kž
Switch-on resistance Ron: 1.5 kž
Operating temperature: 0° to 60°C / 32° to
140°F
Dimensions
Height:
mounting rail: H-35: 84 mm / 3.31 in.
G-32: 89 mm / 3.51 in.
H-15: 83 mm / 3.27 in.
Length: 45 mm / 1.77 in.
Width: 90 mm / 3.54 in.
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