CM-MSS.51P 1SVR740712R1300 ABB CM-MSS.51P Therm. motor protec. relay 2x1c/o, 24-240VAC/DC View larger
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CM-MSS.51P 1SVR740712R1300 ABB CM-MSS.51P Therm. motor protec. relay 2x1c/o, 24-240VAC/DC





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CM-MSS.51P Therm. motor protec. relay 2x1c/o, 24-240VAC/DC

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Electronic relays


* Brand new produt in its original packing covered by the warranties and certifications provided by ABB

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The CM-MSS.51P belongs to the CM thermistor motor protection relay range. It operates with a rated control supply voltage of 24 - 240 V AC / DC and has a 2 c/o (SPDT) output with contacts rated at 250 V / 4 A. It features two sensor circuit to monitor PTC temperature sensors (single or accumulative evaluation, configurable) and works according to the closed-circuit principle. The sensor circuits of this CM-MSS.51P are short-circuit (configurable), as well as interrupted-wire monitored and can be reset automatically, manually or remotely after the failure has been removed. This protection relay is certified according to the ATEX directive 49/9/EC and is equipped with a reset / test button. The non-volatile fault storage, the short circuit detection and the accumulative evaluation can be enabled/disabled via DIP switches. A sealable transparent cover for protection against unauthorized changes is available as accessory. The device offers maintenance free Easy Connect Technology with push-in terminals.


  • EAN:
  • Minimum Order Quantity:
    1 piece
  • Customs Tariff Number:


  • Product Net Width:
    22.5 mm
  • Product Net Height:
    85.6 mm
  • Product Net Depth:
    103.7 mm
  • Product Net Weight:
    0.135 kg

Container Information

  • Package Level 1 Units:
    1 piece
  • Package Level 1 Width:
    97 mm
  • Package Level 1 Height:
    109 mm
  • Package Level 1 Length:
    30 mm
  • Package Level 1 Gross Weight:
    0.161 kg


  • Function:
    2 sensor circuits
    Short-circuit detection, configurable
    Non-volatile fault storage, configurable
    Single or accumulative evalutation, configurable
    Dynamic interrupted wire detection
    Auto, manual or remote reset
    ATEX approved
  • Rated Control Supply Voltage (Us):
    24 ... 240 V AC/DC
  • Output:
    2 x 1 c/o or 1 x 2 c/o contacts, configurable
  • Terminal Type:
    Screwless Terminals
  • Rated Operational Current AC-12 (Ie):
    (230 V) 4 A
  • Rated Operational Current AC-15 (Ie):
    (230 V) 3 A
  • Rated Operational Current DC-12 (Ie):
    (24 V) 4 A
  • Rated Operational Current DC-13 (Ie):
    (24 V) 2 A
  • Minimum Switching Capacity:
    24 V
    10 mA
  • Rated Insulation Voltage (Ui):
    300 V
    Measuring Circuit / Output Circuit 300 V
    Output Circuit 1 / Output Circuit 2 300 V
    Supply Circuit / Measuring Circuit 300 V
    Supply Circuit / Output Circuit 300 V
  • Rated Impulse Withstand Voltage (Uimp):
    Output Circuit 1 / Output Circuit 2 4 kV
    Output Circuit 4 kV
  • Degree of Protection:
    Housing IP50
    Terminals IP20
  • Overvoltage Category:
  • Pollution Degree:
  • Short-Circuit Protective Devices:
    Output Circuit NC - F Type Fuses 6 A
    Output Circuit NO - F Type Fuses 10 A
  • Electrical Durability:
    AC-12 100000 cycle
  • Mechanical Durability:
    30000000 cycle
  • Connecting Capacity:
    Flexible 2x 0.5 ... 1.5 mm²
    Rigid 2x 0.5 ... 1.5 mm²
  • Wire Stripping Length:
    8 mm
  • Mounting Position:
  • Mounting on DIN Rail:
    TH35-15 (35 x 15 mm Mounting Rail) acc. to IEC 60715
    TH35-7.5 (35 x 7.5 mm Mounting Rail) acc. to IEC 60715
  • Standards:
    IEC/EN 60947-8
    UL 508
    CSA 22.2 No. 14


  • Ambient Air Temperature:
    Operation -25 ... +60 °C
    Storage -40 ... +85 °C
  • RoHS Status:
    Following EU Directive 2011/65/EC

Technical UL/CSA

  • Maximum Operating Voltage UL/CSA:
    Output Circuit 300 V AC
  • Contact Rating UL/CSA:
  • Connecting Capacity UL/CSA:
    Flexible 2x 18 ... 16 AWG
    Rigid 2x 20 ... 16 AWG

Certificates and Declarations (Document Number)


  • Object Classification Code:
  • ETIM 5:
    EC001446 - Temperature monitoring relay
  • eClass:
    7.0 27371810

Datasheet - PDF

pdf-CM-MSS.51P Therm. motor protec. relay 2x1c/o, 24-240VAC/DC - ABB - CM-MSS.51P - 1SVR740712R1300English94 Kbytespdf-CM-MSS.51P Therm. motor protec. relay 2x1c/o, 24-240VAC/DC - ABB - CM-MSS.51P - 1SVR740712R1300

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