Product range overview

The thermistor motor protection relays CM-MSE, CM-MSS and CM-MSN are used to control motors equipped with PTC temperature sensors. The PTC temperature sensors are incorporated in the motor windings to measure the motor heating. This enables direct control and evaluation of various operating conditions.

ABB also offers PTC temperature sensors C011 which are suitable for embedding in motor windings.

Characteristics of CM-MSE thermistor motor protection relay

· 1 n/o contact
· Single-supply voltage range
· 22.5 mm wide enclosure


Characteristics of CM-MSS thermistor motor protection relay

· 1 c/o (SPDT) contact, 2 x 1 c/o (SPDT) contact, 2 c/o (SPDT) contacts or 1 n/c + 1 n/o contact
· Wide- or single-supply voltage range
· Short-circuit monitoring of the sensor circuit *
· Front-face test and reset button *
· Non-volatile storage configurable *
· 1- or 2-channel evaluation *
· Accumulative evaluation, up to 3 sensor circuits *
· LEDs for status indication
· 22.5 mm wide enclosure
· Integrated and snap-fitted front-face marker
· Sealable transparent cover (accessory)
· Adapter for screw mounting (accessory)


Characteristics of CM-MSN thermistor motor protection relay

· 1 n/c + 1 n/o contact
· Wide supply voltage range
· Short-circuit monitoring of the sensor circuit
· Front-face test and reset button
· Non-volatile storage configurable
· Accumulative evaluation, up to 6 sensor circuits
· LEDs for status indication
· 45 mm wide enclosure
· Integrated and snap-fitted front-face marker
· Sealable transparent cover (accessory)
· Adapter for screw mounting (accessory)

          * depending on device


Characteristics of C011 PTC temperature sensors

· Standard version acc. to DIN 44081 or triple temperature sensor
· For motors with rated operational voltages of up to 660 V AC
· Response temperatures from 70 °C to 170 °C, depending on sensor
· Conductor length 5 m


Examples of application

· Protection of motors against thermal overload, e. g. caused by insufficient cooling, heavy load starting conditions, undersized motors, increased switching frequency, single-phase operation, high ambient temperature, break operation, unbalance, etc.

Documentation and downloads

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Catalogue
Technical catalogue 2009 - Chapter "Measuring and monitoring relays CM and C5xx range"

English - 6.22 MB - pdf
Certificate
Environmental Information - Measuring and Monitoring Relays CM range, C51range, C558 range, Accessories and current transformers CM-CT

English - 0.02 MB - pdf
Data sheet
2 PG (USA) Data Sheet for CM-MSE Automatic Reset

English - 0.15 MB - pdf
2 PG (USA) Data Sheet for CM-MSE Automatic Reset

English - 0.15 MB - pdf
2 PG (USA) Data Sheet for CM-MSN Automatic or Manual Reset

English - 0.16 MB - pdf
User manual
Application handbook - Measuring and monitoring relays

English - 3.17 MB - pdf
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