Why Choose the ABB CM-SRS.11P Current Monitoring Relay?
The ABB CM-SRS.11P (1SVR740840R0200) is a compact and reliable single-phase current monitoring relay designed to monitor AC and DC electrical currents in industrial control, automation and electrical protection applications. As part of the ABB CM-SRS current monitoring relay series, it provides accurate overcurrent and undercurrent detection to help protect electrical equipment, identify abnormal operating conditions and improve system reliability.
This versatile monitoring relay operates with a 24–240 V AC/DC control supply and offers three selectable current measuring ranges: 3–30 mA, 10–100 mA and 0.1–1 A. Its true RMS measuring principle enables dependable monitoring of AC and DC currents, while adjustable switching thresholds and hysteresis allow the relay to be configured for specific industrial applications.
The CM-SRS.11P features one changeover (SPDT) output contact, configurable overcurrent or undercurrent monitoring and ABB's maintenance-free Easy Connect Technology with push-in terminals. With a compact 22.5 mm housing width and DIN rail mounting, it is ideal for integration into electrical control panels, industrial machinery and automation systems where space-saving installation and reliable current supervision are essential.
Key Advantages
- Reliable single-phase AC and DC current monitoring for industrial electrical systems.
- Wide 24–240 V AC/DC control supply range provides flexibility across different installations.
- Three selectable measuring ranges covering currents from 3 mA to 1 A.
- Configurable overcurrent and undercurrent monitoring for improved equipment protection.
- True RMS measuring principle for dependable current measurement.
- Adjustable hysteresis from 3–30% of the threshold value helps prevent unwanted switching.
- One changeover (SPDT) relay contact enables connection to alarm, signalling and control circuits.
- Maintenance-free push-in terminals simplify wiring and reduce installation time.
- Compact 22.5 mm DIN rail housing saves valuable control cabinet space.
- LED status indicators support straightforward operation and fault identification.
Key Features
- ABB CM-SRS.11P current monitoring relay from the CM-SRS series.
- ABB order code: 1SVR740840R0200.
- Rated control supply voltage: 24–240 V AC/DC.
- Measuring range 1: 3–30 mA.
- Measuring range 2: 10–100 mA.
- Measuring range 3: 0.1–1 A.
- True RMS current measurement for AC and DC applications.
- Selectable overcurrent or undercurrent monitoring.
- Adjustable hysteresis: 3–30% of the selected threshold.
- Relay output: 1 changeover contact (SPDT).
- Output contact rating: 250 V / 4 A.
- Open-circuit operating principle for relay switching.
- Front-mounted adjustment controls for setting monitoring parameters.
- Three LED indicators for operating and switching status.
- ABB Easy Connect Technology with push-in terminals.
- Tool-free mounting and removal from standard DIN rails.
- Optional sealable transparent cover to help prevent unauthorised adjustment.
- Compact modular construction suitable for industrial control cabinets.
Technical Specifications
- Manufacturer: ABB
- Series: CM-SRS Current Monitoring Relays
- Model: CM-SRS.11P
- Manufacturer part number: 1SVR740840R0200
- ABB product group: 310921 – Measuring & Monitoring Relays
- Product type: Single-phase current monitoring relay
- Monitoring function: Overcurrent or undercurrent
- Measured current type: AC / DC
- Measuring principle: True RMS
- Rated control supply voltage: 24–240 V AC/DC
- AC supply frequency: 50 / 60 Hz
- Current measuring range 1: 3–30 mA
- Current measuring range 2: 10–100 mA
- Current measuring range 3: 0.1–1 A
- Hysteresis adjustment: 3–30% of threshold value
- Output contacts: 1 changeover (SPDT)
- Contact rating: 250 V / 4 A
- Rated operational current AC-12: 4 A at 230 V AC
- Rated operational current AC-15: 3 A at 230 V AC
- Rated operational current DC-12: 4 A at 24 V DC
- Rated operational current DC-13: 2 A at 24 V DC
- Minimum switching capacity: 24 V / 10 mA
- Operating principle: Open-circuit principle
- Connection technology: Push-in terminals (Easy Connect Technology)
- Mounting type: DIN rail mounting
- Housing protection rating: IP50
- Terminal protection rating: IP20
- Operating ambient temperature: −20 to +60 °C
- Storage temperature: −40 to +85 °C
- Dimensions (H × W × D): 85.6 × 22.5 × 103.7 mm
- Housing width: 22.5 mm
- Net weight: approx. 0.137 kg
- Status indication: 3 LEDs
- Housing flammability classification: UL 94 V-0
- EAN: 4016779852463
Reliable Current Monitoring for Industrial Electrical Systems
Current monitoring relays such as the ABB CM-SRS.11P continuously supervise electrical current and respond when the measured value crosses a configured threshold. By detecting overcurrent or undercurrent conditions, the relay helps identify electrical overloads, abnormal load behaviour, interrupted circuits and other operating conditions that may affect industrial equipment.
The CM-SRS.11P uses a true RMS measuring principle and offers three selectable measuring ranges, allowing users to monitor low-level AC or DC currents with adjustable switching thresholds. Its configurable overcurrent and undercurrent functions provide flexibility for applications requiring current-dependent signalling, alarm activation or automatic control responses.
The adjustable 3–30% hysteresis helps prevent repeated relay switching when measured current fluctuates close to the selected threshold. The integrated changeover contact can be connected to PLC inputs, signalling devices or suitable control circuits, allowing abnormal current conditions to be incorporated into wider industrial automation and protection strategies.
Designed for straightforward panel integration, the relay combines front-mounted adjustment controls, LED status indication and maintenance-free push-in connections. Its narrow DIN rail housing makes it particularly suitable for compact control panels and electrical distribution assemblies where dependable monitoring and efficient installation are important.
Typical Applications
- Industrial motor monitoring: Detecting abnormal current conditions in suitable motor control and auxiliary circuits.
- Electrical control panels: Supervising AC and DC currents in industrial control installations.
- Industrial automation systems: Providing current-dependent switching signals to PLCs and automation equipment.
- Pumps and process equipment: Detecting changes in monitored current that may indicate abnormal load conditions.
- Conveyors and material handling systems: Monitoring current-dependent operating conditions in machinery control circuits.
- Electrical equipment protection: Supporting overcurrent and undercurrent alarm functions.
- Power supply monitoring: Supervising current levels in compatible AC and DC circuits.
- OEM machinery: Integrating compact current monitoring into machine control and diagnostic systems.
- Process control and manufacturing: Providing current threshold signals for equipment monitoring and automated responses.
- Building services and infrastructure: Monitoring suitable electrical loads and auxiliary control circuits.
