PTC thermistor relays
The ATEX-certified motor thermal protection function contains one (+L513) or two (+2L513)
ABB CM-MSS.41 thermistor relay(s) by default. Three ABB CM-MSS.41 thermistor relays
(+3L513) are available as an order-based engineered option.
DOLD MK 9163N.12/110-ATEX thermistor relay(s) are available as an order-based
engineered option.
￭ ABB CM-MSS.41 thermistor motor protection relay
Layout
Power supplyA1-A2
Measuring circuit with 1…3 sensorsT1-T2
Remote reset push button switch
Note: Although autoreset of the relay can be implemented
by connecting these terminals together, this is not recommen-
ded when used in the protection function of an Ex motor.
S1-T2
Output contacts (1)
• 11: Common
• 12: Normally-closed
• 14: Normally-open
11-12/14
Output contacts (2)
• 21: Common
• 22: Normally-closed
• 24: Normally-open
21-22/24
Fault reset button
Reset: only possible if the measured value is less than switch-
on resistance.
Test: only possible when there is no fault.
Test / Reset
Indication of operational statesLEDs
Supply voltage present“U” LED (green)
Fault message (overtemperature, broken wire, or short-circuit in the measurement circuit)“F” LED (red)
Output relay status“R” LED (yellow)
DIP switches
4321Position
Non-volatile fault
storage de-activated
Short-circuit detec-
tion de-activated
Not in useNot in useON
Non-volatile fault
storage activated
Short-circuit detec-
tion activated
Not in useNot in useOFF (default)
22 ATEX-certified motor thermal protection function with PTC thermistor relays (+L513+Q971)
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