Why Choose the ABB CM-SRS.22S Current Monitoring Relay?
The ABB CM-SRS.22S (1SVR730840R0500) is a compact and reliable single-phase current monitoring relay designed to detect overcurrent and undercurrent conditions in industrial electrical systems. As part of the ABB CM-SRS current monitoring relay series, it provides dependable current supervision for electrical equipment, machinery and automation applications requiring accurate monitoring and fault detection.
This monitoring relay features an RMS measuring principle for AC and DC currents, with three selectable measuring ranges covering 0.3–15 A. Its configurable overcurrent and undercurrent monitoring functions, adjustable switching threshold, hysteresis and tripping delay allow engineers to adapt the relay to different operating requirements. Two changeover output contacts provide flexible signalling and straightforward integration with industrial control systems.
With a wide 24–240 V AC/DC control supply and three selectable current measuring ranges of 0.3–1.5 A, 1–5 A and 3–15 A, the CM-SRS.22S is suitable for monitoring electrical loads, control circuits and industrial equipment. Its compact 22.5 mm housing and DIN rail mounting design enable straightforward installation inside electrical control panels and automation cabinets.
Key Advantages
- Reliable single-phase current monitoring relay for industrial electrical systems.
- Wide 24–240 V AC/DC control supply for flexible integration with industrial control circuits.
- Three selectable current measuring ranges covering 0.3–15 A.
- Configurable overcurrent and undercurrent monitoring functions.
- RMS measuring principle for dependable AC and DC current supervision.
- Two changeover (SPDT) output contacts rated at 250 V / 4 A.
- Adjustable hysteresis from 3–30% helps prevent unwanted switching around the configured threshold.
- Adjustable tripping delay from 0.1–30 s, with an instantaneous setting.
- Front-mounted adjustment controls simplify configuration and commissioning.
- LED status indication supports convenient monitoring and fault identification.
- Compact DIN rail mounting design helps conserve space inside electrical control cabinets.
- Secure screw terminal connections simplify installation and maintenance.
Key Features
- ABB CM-SRS.22S single-phase current monitoring relay.
- Manufacturer part number: 1SVR730840R0500.
- 24–240 V AC/DC rated control supply voltage.
- Three selectable current measuring ranges: 0.3–1.5 A, 1–5 A and 3–15 A.
- RMS measurement for AC and DC currents.
- Selectable overcurrent or undercurrent monitoring.
- Adjustable hysteresis: 3–30% of the threshold value.
- Adjustable tripping delay: 0 s or 0.1–30 s.
- Two changeover (SPDT) output contacts rated at 250 V / 4 A.
- Open-circuit operating principle.
- Adjustable current monitoring threshold.
- LED indicators for operating and relay status.
- Double-chamber cage connection terminals with screw connections.
- 22.5 mm housing width for space-efficient installation.
- DIN rail mounting for industrial electrical control panels.
- Optional sealable transparent cover for protection against unauthorised adjustments.
Technical Specifications
- Manufacturer: ABB
- Series: CM-SRS Current Monitoring Relays
- Model: CM-SRS.22S
- ABB order code: 1SVR730840R0500
- ABB product group: 310921-Measuring & Monitoring Relays
- Product type: Single-phase current monitoring relay
- Rated control supply voltage: 24–240 V AC/DC
- Monitoring function: Overcurrent or undercurrent
- Measuring principle: RMS measurement for AC and DC currents
- Measuring range 1: 0.3–1.5 A
- Measuring range 2: 1–5 A
- Measuring range 3: 3–15 A
- Hysteresis: Adjustable, 3–30% of threshold value
- Tripping delay: 0 s or adjustable 0.1–30 s
- Output contacts: 2 changeover (SPDT) contacts
- Contact rating: 250 V / 4 A
- UL/CSA contact rating: B300
- Maximum operating voltage (UL/CSA): 300 V AC, output circuit
- Operating principle: Open-circuit principle
- Terminal type: Screw terminals with double-chamber cage connections
- Terminal tightening torque: 0.8 N·m
- Mounting type: DIN rail mounting
- Operating ambient temperature: −20 to +60 °C
- Storage temperature: −40 to +85 °C
- Dimensions (H × W × D): 85.6 × 22.5 × 103.7 mm
- Net weight: 0.144 kg
- EAN: 4016779852258
- Customs tariff number: 85364900
Reliable Current Monitoring for Industrial Electrical Systems
Current monitoring relays such as the ABB CM-SRS.22S continuously supervise electrical current and respond when the measured value crosses a configured threshold. By detecting overcurrent or undercurrent conditions, the relay helps identify abnormal electrical loading, unexpected reductions in current and changes in equipment operating conditions that could affect the reliability of connected machinery.
The CM-SRS.22S uses an RMS measuring principle to monitor AC and DC currents across three selectable measuring ranges. Engineers can configure the monitoring function, current threshold, hysteresis and tripping delay to match the requirements of the monitored circuit. When the configured switching conditions are met, the relay changes the state of its output contacts, allowing connected control systems to activate alarms, initiate shutdown sequences or perform other protective actions.
The adjustable tripping delay allows engineers to select instantaneous operation or introduce a delay of up to 30 s. This helps distinguish temporary current fluctuations from sustained abnormal operating conditions and can reduce unnecessary switching during short-duration load changes. Adjustable hysteresis further improves operational stability by reducing repeated switching when the monitored current remains close to the configured threshold.
Its two changeover contacts enable flexible integration with PLC inputs, contactor control circuits and industrial alarm systems. The wide 24–240 V AC/DC control supply, compact DIN rail housing, front-mounted adjustment controls and screw terminal connections make the CM-SRS.22S a practical solution for current supervision in industrial automation and electrical control installations.
Typical Applications
- Industrial single-phase current monitoring and supervision.
- Overcurrent and undercurrent detection in electrical control circuits.
- AC and DC current monitoring in industrial equipment.
- Electrical load supervision in machinery and automation systems.
- Motor operating condition monitoring and fault detection.
- Current monitoring in pumps, fans and processing equipment.
- PLC-based monitoring and alarm signalling applications.
- Electrical control panels and industrial distribution cabinets.
- Manufacturing and production equipment monitoring.
- Current supervision in conveyor and material handling systems.
- Industrial control systems requiring adjustable monitoring delays.
- OEM machinery and automated control systems.
