Find similar products by selecting one or more attributes.

Select all	Attribute	Value
	Brand	ABB
	Product Type	Monitoring Relay
	Sub Type	PTC
	Contact Configuration	SPDT
	Mount Type	DIN Rail
	Switching Voltage	24 V ac
	Terminal Type	Screw
	IP Rating	IP20, IP50
	Contact Current	3.7mA
	Minimum Operating Temperature	-25°C
	Supply AC Voltage	24/240 V ac
	Supply DC Voltage	24 V dc
	Maximum Operating Temperature	60°C
	Series	CM-MSS
	Standards/Approvals	UL
	Length	103.7mm
	Width	22.5 mm
	Height	85.6mm

	Select all
	Brand ABB
	Product Type Monitoring Relay
	Sub Type PTC
	Contact Configuration SPDT
	Mount Type DIN Rail
	Switching Voltage 24 V ac
	Terminal Type Screw
	IP Rating IP20, IP50
	Contact Current 3.7mA
	Minimum Operating Temperature -25°C
	Supply AC Voltage 24/240 V ac
	Supply DC Voltage 24 V dc
	Maximum Operating Temperature 60°C
	Series CM-MSS
	Standards/Approvals UL
	Length 103.7mm
	Width 22.5 mm
	Height 85.6mm

ABB CM-MSS Series Monitoring Relay, Temperature Monitoring, SPDT Contact Configuration - 1SVR730722R1400 CM-MSS.21S

This monitoring relay is designed for temperature applications, specifically focusing on the winding temperature of motors. Compact in design, it measures 103.7mm x 22.5mm x 85.6mm, making it suitable for DIN rail mounting. The device effectively monitors and protects motors against overheating, overload, and insufficient cooling, ensuring optimal performance and longevity.

Features & Benefits

• Utilises SPDT configuration for versatile control options

• Automatic reset function enhances user convenience

• Non-volatile fault storage records issues for diagnosis

• Equipped with overtemperature and overload protection

• Short-circuit monitoring safeguards sensor integrity

• ATEX certification ensures safe operation in hazardous areas

Applications

• Utilised for monitoring motor winding temperatures

• Employed in industrial motor protection systems

• Suitable for use in automation and mechanical settings

• Ideal for integration in electrical control panels

How does the automatic reset function operate in the relay?

The automatic reset function allows the relay to re-energise once the monitored temperature falls below the set threshold after an overheating incident, ensuring minimal downtime and continuous operation without manual intervention.

What types of sensors can be connected to the relay for monitoring?

The relay is compatible with PTC type A sensors, which can be incorporated directly into motor windings to provide precise temperature readings, ensuring accurate monitoring for preventive measures.

Can this relay differentiate between fault types during operation?

Yes, the device features dynamic interrupted wire detection. It distinguishes between overtemperature conditions and an interrupted wire in the measuring circuit, providing relevant fault information through LED indicators.

What is the reaction time of the safety functions integrated into the relay?

The safety function of the monitoring relay has a rapid reaction time of less than 100 milliseconds, ensuring quick response to any temperature anomalies for effective protection of motors.

ABB Monitoring Relay, SPDT, DIN Rail, 24 V dc 24/240 V ac

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