ABB CM Current Monitoring Relays

ABB CM Current Monitoring Relays Supplier and Exporter in India

ABB CM Current Monitoring Relays for Overcurrent & Undercurrent Protection

ABB CM current monitoring relays are used to monitor current levels in machines, motors, heating circuits, pumps, conveyors and industrial control systems. The relay continuously checks the measured current and changes its output contact when the current goes above or below the selected setting.

The ABB CM current monitoring range is suitable for both AC and DC monitoring. Depending on the model, currents from a few milliamps up to 15 A can be monitored directly. This makes the range useful for applications ranging from small control and sensor circuits to motor and machine load monitoring.

The main product groups are ABB CM-SRS current monitoring relays and ABB CM-SFS current window monitoring relays. Different measuring ranges, output contacts, supply voltages and screw or push-in terminal versions are available.

For an ABB current monitoring relay supplier in India, CM-SRS overcurrent relay, CM-SFS current window relay or ABB monitoring relay export requirement, buyers can share the complete model number, current range, supply voltage and quantity for quotation.

ABB CM Current Monitoring Relay Models

ABB CM-SRS Current Monitoring Relays

The CM-SRS series is used where either overcurrent or undercurrent needs to be monitored.

Depending on the model, the relay can be set to operate when:

• Current rises above the selected limit
• Current falls below the selected limit
• A motor or load draws excessive current
• Current disappears or drops below the required operating level

Main model groups include:

• CM-SRS.11S / CM-SRS.11P
• CM-SRS.12S
• CM-SRS.21S / CM-SRS.21P
• CM-SRS.22S
• CM-SRS.M1S / CM-SRS.M1P
• CM-SRS.M2S

The CM-SRS.M versions provide additional functions such as selectable operating principle and latching depending on the model.

ABB CM-SFS Current Window Monitoring Relays

The CM-SFS series monitors both an upper and lower current limit.

Instead of checking only one threshold, the relay can supervise whether the current remains within an acceptable operating window.

Main models include:

• CM-SFS.21S
• CM-SFS.21P
• CM-SFS.22S

These relays are useful where both excessive current and abnormally low current can indicate a machine or process problem.

ABB CM Current Measuring Ranges

ABB CM current monitoring relays cover several measuring ranges.

Depending on the selected model, available ranges include:

• 3–30 mA
• 10–100 mA
• 0.1–1 A
• 0.3–1.5 A
• 1–5 A
• 3–15 A

This wide range allows the same CM family to be used for small electronic loads as well as industrial equipment drawing several amperes.

For currents above the direct measuring range, a suitable current transformer can be used according to the application.

Technical Specifications

• Product family: ABB CM
• Relay type: Current monitoring relay
• Main series: CM-SRS and CM-SFS
• Application: Single-phase AC/DC monitoring
• Monitoring functions: Overcurrent, undercurrent and current window monitoring
• Measuring principle: True RMS
• Measuring range: 3 mA to 15 A depending on model
• Measuring ranges: 3–30 mA, 10–100 mA, 0.1–1 A, 0.3–1.5 A, 1–5 A and 3–15 A
• Control supply options: 24–240 V AC/DC, 110–130 V AC or 220–240 V AC depending on model
• Output contacts: One or two changeover contacts depending on version
• Adjustable threshold: Available
• Adjustable time delay: Available on applicable models
• Latching function: Available on selected versions
• Operating principle: Open-circuit / closed-circuit selectable on applicable models
• Connection options: Screw or push-in terminals
• Housing width: 22.5 mm
• Mounting: DIN rail
• LED status indication
• Suitable for AC and DC current measurement

Screw & Push-In Terminal Versions

ABB offers CM current monitoring relays with two terminal technologies.

S suffix – Screw terminals

Examples:

• CM-SRS.11S
• CM-SRS.21S
• CM-SRS.M1S
• CM-SFS.21S

P suffix – Push-in terminals

Examples:

• CM-SRS.11P
• CM-SRS.21P
• CM-SRS.M1P
• CM-SFS.21P

The electrical monitoring function can be the same, while the terminal version can be selected according to the panel builder’s preferred wiring method.

Features

• Overcurrent and undercurrent monitoring
• Current window monitoring with CM-SFS models
• AC and DC current measurement
• True RMS measuring principle
• Wide measuring range from 3 mA to 15 A
• Adjustable current threshold from the front of the relay
• Time-delay options on applicable models
• Latching function on selected versions
• One or two changeover output contacts depending on model
• Wide-range supply versions available
• Screw and push-in terminal options
• Compact 22.5 mm DIN rail housing
• LED indication for quick status checking
• Suitable for machine, motor and process monitoring

ABB CM-SRS for Overcurrent Monitoring

Overcurrent monitoring is useful where an increase in load current can indicate an overload, blockage or mechanical problem.

For example, if a conveyor motor normally operates within a certain current range and the conveyor becomes jammed, the motor current can rise. A CM-SRS overcurrent monitoring relay can detect this increase and provide an output signal for an alarm, shutdown or control circuit.

Typical overcurrent applications include:

• Conveyor overload monitoring
• Pump overload detection
• Machine jam detection
• Hoisting equipment
• Heating circuit supervision
• Locked rotor indication
• Industrial load monitoring

ABB CM-SRS for Undercurrent Monitoring

Low current can also indicate a fault. A motor or process may still receive power while the actual load has disappeared. Monitoring only voltage may therefore not identify the problem.

An ABB CM-SRS relay can be configured for undercurrent monitoring and used for applications such as:

• Pump dry-running detection
• Broken conveyor belt detection
• Heater failure monitoring
• Loss of machine load
• Broken drive coupling
• Fan or ventilation system monitoring
• Detection of disconnected loads

This makes current monitoring useful where the actual operating condition of the equipment needs to be checked rather than simply confirming that voltage is present.

ABB CM-SFS Current Window Monitoring

CM-SFS relays are useful when the normal operating current must remain between two limits.

An upper and lower threshold can be set. If the measured current moves outside this range, the output relay changes state.

This type of monitoring can be used for:

• Machine load supervision
• Pump operation
• Motor load monitoring
• Conveyor systems
• Process equipment
• Heating systems
• Industrial production machinery

The CM-SFS range is useful where both an overload and an unloaded condition can indicate a problem.

Applications

ABB CM current monitoring relays are commonly used in:

• Motor current monitoring
• Pump protection and dry-run monitoring
• Conveyor systems
• Hoisting equipment
• Cranes and lifting systems
• Industrial machines
• Packaging machinery
• Material handling systems
• Heating circuits
• Lighting circuits
• Ventilation equipment
• Fans and blowers
• Process plants
• Water and wastewater systems
• HVAC equipment
• Machine tools
• OEM equipment
• PLC and automation panels
• MCC panels
• Industrial control panels
• Load monitoring
• Overload detection
• Locked rotor monitoring
• Broken belt or coupling detection

Choosing the Correct ABB CM Current Monitoring Relay

For a quotation, the following details are useful:

• Required ABB CM model
• Measuring current range
• Overcurrent, undercurrent or window monitoring requirement
• AC or DC measured current
• Control supply voltage
• Number of output contacts
• Screw or push-in terminal preference
• Required quantity
• Destination country

If the requirement is for replacement of an existing ABB monitoring relay, sharing the complete model number or a clear nameplate photograph helps identify the correct version.

Looking for ABB CM Current Monitoring Relays?

We supply ABB CM current monitoring relays for industrial automation, motor and pump monitoring, machine protection, panel building, OEM requirements and export projects.

Enquiries are welcome for ABB CM-SRS.11, CM-SRS.12, CM-SRS.21, CM-SRS.22, CM-SRS.M1, CM-SRS.M2 and CM-SFS.21 / CM-SFS.22 current monitoring relays, including screw and push-in terminal versions.

For an ABB CM current monitoring relay supplier and exporter from India, ABB overcurrent monitoring relay, undercurrent relay, CM-SRS relay or CM-SFS current window relay, send the complete model, current range, supply voltage, quantity and destination country for quotation.