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Specification & Description
| Specification | Description |
|---|---|
| Part Number | CM-MSS |
| Alternative Part Number | CMMSS |
| Manufacturer | ABB |
| Mounting Type | DIN Rail Mount |
| Dimensions | 103.7 x 22.5 x 85.6 mm |
| Operating Voltage | 24 to 240 V ac/dc |
| Current Rating | 4 A |
| Number of Sensor Circuits | 1 |
| Sensor Type | PTC type A (DIN/EN 44081, DIN/EN 44082) |
| Contact Configuration | 1NO/NC |
| Output Type | Relay, 1st and 2nd c/o (SPDT) contact |
| Rated Operational Voltage | 250 V AC |
| Minimum Switching Voltage | 24 V |
| Minimum Switching Current | 10 mA |
| Maximum Switching Voltage/Current | Refer to 'Load limit curves' in datasheet |
| Electrical Insulation | Between supply circuit and measuring circuit |
| Power Failure Buffering Time | 20 ms |
| Overtemperature Monitoring | Switch-off resistance (relays de-energize) 2.83 kΩ, Switch-on resistance (relays energize) 1.1 kΩ |
| Short-circuit Detection | Configurable |
| Interrupted Wire Detection | Dynamic |
| Non-volatile Fault Storage | Configurable |
| Test Function | Yes |
| Control Functions | Manual reset, auto reset (adjustable), remote reset (adjustable) |
| Indication of Operational States | LED green for control supply voltage, LED yellow for relay status, LED red for fault message |
| Mechanical Lifetime | 30 x 10^6 switching cycles |
| Electrical Lifetime | At AC12, 230 V AC, 4 A: 0.1 x 10^6 switching cycles |
| Degree of Protection | Housing: IP50, Terminals: IP20 |
| Electrical Connection | Screw connection technology or Easy Connect Technology (push-in) |
| Commodity Code | 853641 |
The ABB CM-MSS Motor Protection Relay is a sophisticated device engineered to safeguard motors from potential damage due to overheating. This DIN rail mountable unit is designed for seamless integration into industrial control systems, offering both reliability and ease of use. With a versatile control supply voltage range of 24 to 240 V ac/dc, it caters to a broad spectrum of applications.
The CM-MSS features a compact form factor, measuring 103.7 x 22.5 x 85.6 mm, making it suitable for installations where space is at a premium. It comes equipped with 1NO/NC contacts and a 4 A current rating, ensuring robust performance for most motor protection scenarios. The relay's ability to connect up to three PTC type A thermistor sensors in series per circuit allows for precise temperature monitoring, ensuring motors operate within safe thermal limits.
Configurability is a key strength of the CM-MSS, with DIP switches enabling easy setup and adjustments. The front-facing LEDs provide clear and immediate status indication, simplifying diagnostics and maintenance tasks. The relay's automatic, manual, and remote reset functions offer flexibility in addressing fault conditions, ensuring quick recovery and minimal downtime.
Designed with a focus on operational efficiency, the CM-MSS relay is a reliable choice for protecting valuable motor assets in a variety of industrial environments. Whether it's in manufacturing, processing, or any application where motor integrity is critical, this relay stands as a testament to ABB's commitment to quality and innovation in motor protection technology.
Commonly Asked Questions
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Frequently Asked Questions
What is the function of this motor protection relay?
The ABB Motor Protection Relay is designed to monitor the temperature of motor windings and protect the motor from overheating, overload, and insufficient cooling. It uses PTC thermistor sensors to detect excessive temperatures and disconnect the power to prevent damage.
Can this relay be used for different supply voltages?
Yes, the relay is versatile and can accommodate a range of control supply voltages from 24 to 240 V ac/dc, making it suitable for various applications.
How can I reset the relay after a fault has occurred?
The relay can be reset manually using the front-face Test/Reset button, remotely via a remote reset between specific terminals, or automatically, depending on the model and configuration.
Is this relay suitable for use in hazardous locations?
Certain models within the CM-MSS range are certified for use in hazardous locations, such as those with explosive gas and dust atmospheres, making them suitable for a wide range of industrial applications.
What type of certifications does this relay have?
The relay boasts several international certifications, including CB Scheme, UL, CSA, and EAC, ensuring compliance with global standards for safety and quality.
How can I configure the relay for my specific needs?
The relay features DIP switches that allow for easy configuration of various settings, such as fault storage and short-circuit detection, to tailor its operation to your specific requirements.
What kind of indicators does the relay have for monitoring its status?
The relay is equipped with LED indicators that provide visual status information and fault messages, helping you quickly identify operational states such as overtemperature, short-circuit, or wire break.
Can this relay be mounted on a DIN rail?
Yes, the relay is designed for DIN rail mounting, which facilitates easy installation and integration into electrical panels and equipment.
What is the maximum switching current for this relay?
The relay can handle a maximum switching current of 4 A, which should be considered when integrating it into your motor protection scheme.
Does the relay offer protection against short circuits in the sensor circuit?
Yes, the relay includes short-circuit monitoring of the sensor circuit as one of its protective features, enhancing the safety of your motor application.
