ABB CM Thermistor Motor Protection Relays

ABB CM Thermistor Motor Protection Relays Supplier and Exporter in India

ABB CM-MSS Thermistor Relays for Motor Winding Protection

ABB CM thermistor motor protection relays are used to protect electric motors against excessive winding temperature. They work with PTC thermistor sensors installed directly inside the motor windings, allowing the relay to react to the actual motor temperature.

This type of protection is useful where overheating can occur because of heavy starting, frequent switching, high ambient temperature, overload, phase imbalance or poor cooling. When the PTC sensor reaches its response temperature, the CM relay changes its output contact so the motor contactor or control circuit can shut the motor down.

ABB’s thermistor motor protection range mainly includes CM-MSE and CM-MSS relays, with different versions for automatic or manual reset, sensor-circuit supervision, multiple sensor circuits, ATEX applications and different control supply voltages.

For an ABB CM-MSS thermistor motor protection relay supplier in India, PTC motor protection relay, CM-MSS.41 ATEX relay or ABB CM-MSS thermistor motor protection relay export requirement, buyers can share the exact model, control voltage and quantity for quotation.

ABB CM Thermistor Motor Protection Relay Models

ABB CM-MSE

CM-MSE is used for straightforward PTC thermistor motor temperature monitoring.

It is suitable where basic winding-temperature protection with automatic reset is required and is commonly used with motors fitted with PTC temperature sensors.

Different control supply versions are available.

ABB CM-MSS.11

CM-MSS.11 is a single-sensor-circuit thermistor motor protection relay with a wide 24–240 V AC/DC control supply.

Main functions include:

• Motor winding temperature monitoring
• Automatic reset
• Dynamic interrupted-wire detection
• Fault storage
• LED status indication
• PTC sensor supervision

Available versions:

• CM-MSS.11S – screw terminals
• CM-MSS.11P – push-in terminals

ABB CM-MSS.12 & CM-MSS.13

These are compact single-circuit motor thermistor relays with automatic reset.

Models include:

• CM-MSS.12S / CM-MSS.12P – 24 V AC/DC
• CM-MSS.13S / CM-MSS.13P – 110–130 V AC or 220–240 V AC

They are useful where a simple PTC motor protection relay with a defined control voltage is required.

ABB CM-MSS.21

CM-MSS.21 adds further sensor-circuit supervision while retaining a wide 24–240 V AC/DC control supply.

Available as:

• CM-MSS.21S – screw terminals
• CM-MSS.21P – push-in terminals

It is suited to industrial motor protection where monitoring of the PTC circuit itself is also important.

ABB CM-MSS.22 & CM-MSS.23

CM-MSS.22 and CM-MSS.23 provide additional reset options and two changeover output contacts.

Models include:

• CM-MSS.22S / CM-MSS.22P – 24 V AC/DC
• CM-MSS.23S / CM-MSS.23P – 110–130 V AC or 220–240 V AC

These versions can be considered where the motor protection trip signal needs to be used in more than one control or alarm circuit.

ABB CM-MSS.31, CM-MSS.32 & CM-MSS.33

These models provide more advanced motor thermistor protection with functions such as sensor short-circuit detection, interrupted-wire monitoring and configurable reset.

Main versions include:

• CM-MSS.31S / CM-MSS.31P – 24–240 V AC/DC
• CM-MSS.32S / CM-MSS.32P – 24 V AC/DC
• CM-MSS.33S / CM-MSS.33P – higher AC control supply versions

CM-MSS.31 also provides non-volatile fault storage and front Test/Reset operation.

ABB CM-MSS.41

CM-MSS.41 is an advanced thermistor motor protection relay intended for applications where greater supervision of the PTC circuit is required.

It provides:

• PTC motor temperature monitoring
• Test / Reset button
• Manual reset
• Automatic reset
• Remote reset
• Sensor short-circuit monitoring
• Dynamic interrupted-wire detection
• Non-volatile fault storage
• 24–240 V AC/DC supply
• ATEX-approved motor protection applications

Versions:

• CM-MSS.41S – 1SVR730712R1200
• CM-MSS.41P – 1SVR740712R1200

ABB CM-MSS.51

CM-MSS.51 is particularly useful where two PTC sensor circuits need to be monitored.

It can be configured for separate or combined evaluation of the two sensor circuits, allowing two motor temperature circuits or two areas of a motor to be supervised.

Versions include:

• CM-MSS.51S – 1SVR730712R1300
• CM-MSS.51P – 1SVR740712R1300

Both operate with a wide 24–240 V AC/DC control supply.

Technical Specifications

• Product family: ABB CM-MSx
• Main ranges: CM-MSE and CM-MSS
• Application: Motor winding temperature protection
• Sensor type: PTC thermistor sensors
• PTC sensors installed directly in motor windings
• Sensor circuits: One or two depending on model
• Control supply: Model dependent
• Wide-range supply versions: 24–240 V AC/DC
• Automatic reset: Available
• Manual reset: Available on selected models
• Remote reset: Available on selected models
• Test function: Available on advanced CM-MSS versions
• Interrupted-wire monitoring: Available
• Sensor short-circuit monitoring: Available on selected models
• Non-volatile fault storage: Available on selected models
• Output contacts: Model dependent
• Screw terminal versions: S suffix
• Push-in terminal versions: P suffix
• Housing width: 22.5 mm
• DIN rail mounting
• LED operating and fault indication
• Product standard: IEC/EN 60947-8
• ATEX-approved variants available

Features

• Direct motor winding temperature monitoring
• Works with PTC sensors installed inside the motor
• Protection against excessive motor temperature
• Detects overheating caused by overload or poor cooling
• Automatic, manual and remote reset options depending on model
• Sensor wire-break monitoring
• Short-circuit detection on applicable models
• Fault memory on selected versions
• Test and reset function on advanced models
• Screw and push-in connection options
• Wide 24–240 V AC/DC supply versions available
• Compact DIN rail mounting
• ATEX versions for suitable hazardous-area motor applications

Motor Protection with PTC Thermistor Sensors

A normal overload relay mainly reacts to motor current. A thermistor motor protection relay works differently.

PTC sensors are installed inside the motor winding and respond directly to the winding temperature. If the motor becomes too hot, the PTC resistance rises sharply, and the CM relay operates.

This can protect the motor in situations where excessive temperature is caused by more than just high current.

Typical causes include:

• Motor overload
• Heavy starting
• Frequent motor starting
• High ambient temperature
• Poor ventilation
• Blocked cooling fan
• Reduced cooling
• Phase imbalance
• Frequent reversing or braking

For motors already supplied with PTC thermistors, an ABB CM-MSS PTC motor protection relay provides a practical way to include the sensors in the motor control and shutdown circuit.

ABB CM-MSS for ATEX Motor Protection

Selected CM-MSS versions are approved for motor protection applications involving explosion-protected motors.

One important model is ABB CM-MSS.41, which provides advanced PTC sensor supervision along with ATEX-related approvals.

In these installations, the PTC sensors are located in the motor while the thermistor protection relay itself is installed in the control panel outside the hazardous area.

The exact relay version and applicable certification should be checked against the motor and project requirements before selection.

Applications

ABB CM thermistor relays are used with:

• Three-phase electric motors
• Pumps
• Compressors
• Fans and blowers
• Conveyors
• Crushers
• Mills
• HVAC motors
• Process machinery
• Machine tools
• Packaging equipment
• Material handling systems
• Industrial drives
• Generator applications
• Motors with frequent starting
• Motors operating in high ambient temperatures
• Hazardous-area motors with applicable PTC protection
• MCC panels
• Motor control panels
• OEM machinery
• Industrial automation systems

They can also be used for temperature monitoring of other equipment fitted with suitable PTC sensors.

Choosing the Correct ABB CM-MSS Relay

For an ABB thermistor motor protection relay enquiry, provide:

• Existing ABB model number, if applicable
• Motor PTC sensor details
• Number of sensor circuits
• Control supply voltage
• Automatic or manual reset requirement
• Remote reset requirement
• ATEX requirement, if applicable
• Screw or push-in terminals
• Output contact requirement
• Quantity
• Destination country

For replacement requirements, send a photograph of the existing relay nameplate so the exact CM-MSS version can be checked.

Looking for ABB CM Thermistor Motor Protection Relays?

We supply ABB CM thermistor motor protection relays for motors, pumps, compressors, industrial machinery, MCC panels, OEM equipment and export projects.

Enquiries are welcome for ABB CM-MSE, CM-MSS.11, CM-MSS.12, CM-MSS.13, CM-MSS.21, CM-MSS.22, CM-MSS.23, CM-MSS.31, CM-MSS.32, CM-MSS.33, CM-MSS.41 and CM-MSS.51 thermistor motor protection relays.
For an ABB CM-MSS relay supplier and exporter from India, ABB PTC motor protection relay, motor winding temperature relay, CM-MSS.41 ATEX relay or CM-MSS.51 thermistor relay, send the exact model, control voltage, quantity and destination country for quotation.