Why Choose the ABB CM-ESS.2P Voltage Monitoring Relay?
The ABB CM-ESS.2P (1SVR740831R1400) is a compact and reliable single-phase AC/DC voltage monitoring relay designed to detect abnormal voltage conditions in industrial electrical systems. As part of the ABB CM-ESS measuring and monitoring relay series, it provides configurable overvoltage or undervoltage supervision to help protect electrical equipment, improve operational reliability and support automated fault detection.
The CM-ESS.2P uses a true RMS measuring principle and provides four selectable voltage measuring ranges covering 3–600 V AC/DC. Its adjustable voltage threshold, configurable hysteresis and adjustable tripping delay enable precise monitoring of electrical supplies and control circuits. Two changeover output contacts provide reliable switching and signalling when monitored voltage conditions exceed the configured limits.
With a rated control supply voltage of 220–240 V AC, two changeover relay contacts and maintenance-free push-in connection terminals, the ABB CM-ESS.2P is suitable for industrial control panels, machinery protection and electrical distribution applications. Its compact 22.5 mm-wide DIN rail housing enables straightforward installation while conserving valuable space inside electrical enclosures.
Key Advantages
- Reliable single-phase AC/DC voltage monitoring for industrial electrical systems.
- 220–240 V AC control supply suitable for standard industrial control circuits.
- Four selectable measuring ranges covering 3–600 V AC/DC.
- Configurable overvoltage or undervoltage monitoring for flexible protection applications.
- True RMS measurement supports accurate monitoring of AC voltage signals.
- Adjustable hysteresis from 3–30% helps prevent unwanted relay switching.
- Adjustable tripping delay allows transient voltage conditions to be accommodated.
- Two changeover output contacts provide flexible fault signalling and control.
- Maintenance-free ABB Easy Connect Technology push-in terminals simplify wiring.
- Compact 22.5 mm DIN rail design saves control cabinet space.
Key Features
- ABB CM-ESS.2P voltage monitoring relay.
- 220–240 V AC rated control supply voltage.
- 3–600 V AC/DC overall measuring range.
- Four selectable measuring ranges: 3–30 V, 6–60 V, 30–300 V and 60–600 V.
- Selectable overvoltage or undervoltage monitoring function.
- True RMS measuring principle for AC and DC voltage supervision.
- Adjustable voltage monitoring threshold.
- Adjustable hysteresis: 3–30% of the threshold value.
- Two changeover (SPDT) output contacts.
- Contact rating: 250 V / 4 A.
- Adjustable tripping delay: instantaneous or 0.1–30 s.
- Open-circuit operating principle.
- Three front-panel LEDs for operating and relay status indication.
- Front-face operating controls for convenient configuration.
- ABB Easy Connect Technology with push-in terminals.
- Tool-free mounting and removal from DIN rails.
- 22.5 mm housing width for compact panel installation.
- Flame-retardant housing material classified to UL 94 V-0.
Technical Specifications
- Manufacturer: ABB
- Series: CM-ESS Measuring and Monitoring Relays
- Model: CM-ESS.2P
- ABB order code: 1SVR740831R1400
- Product type: Electronic voltage monitoring relay
- Monitoring function: Selectable overvoltage or undervoltage monitoring
- Monitored voltage type: Single-phase AC/DC
- Rated control supply voltage: 220–240 V AC
- Measuring range 1: 3–30 V AC/DC
- Measuring range 2: 6–60 V AC/DC
- Measuring range 3: 30–300 V AC/DC
- Measuring range 4: 60–600 V AC/DC
- Measuring principle: True RMS
- Voltage threshold: Adjustable
- Hysteresis: Adjustable, 3–30% of threshold value
- Output contacts: 2 changeover (SPDT) contacts
- Contact rating: 250 V / 4 A
- Tripping delay: 0 s or adjustable 0.1–30 s
- Operating principle: Open-circuit principle
- Terminal type: Push-in, screwless terminals
- Connection technology: ABB Easy Connect Technology
- Status indication: 3 LEDs
- Mounting type: DIN rail mounting
- Housing protection rating: IP50
- Terminal protection rating: IP20
- Operating temperature: −20 to +60 °C
- Storage temperature: −40 to +85 °C
- Dimensions (H × W × D): 85.6 × 22.5 × 103.7 mm
- Net weight: 0.17 kg
- Housing material classification: UL 94 V-0
- EAN: 4016779852456
- Product category: Measuring and Monitoring Relays
Reliable Voltage Monitoring for Industrial Electrical Systems
Voltage monitoring relays such as the ABB CM-ESS.2P continuously supervise electrical voltage levels and respond when measured values exceed configured thresholds. By detecting overvoltage or undervoltage conditions, the relay can activate external alarm, control or protection circuits to help prevent unsuitable operating conditions from affecting connected equipment. Its true RMS measuring principle provides dependable measurement of AC voltages, while its four selectable measuring ranges support a broad range of AC and DC monitoring applications.
The CM-ESS.2P is designed for industrial automation engineers, electrical panel builders and maintenance professionals requiring configurable voltage supervision. Its adjustable hysteresis and tripping delay help reduce unnecessary switching caused by short-duration voltage fluctuations. Combined with two changeover output contacts, convenient front-panel adjustments and maintenance-free push-in terminals, the relay offers a practical solution for integrating voltage monitoring into industrial control and protection systems.
Typical Applications
- Industrial single-phase voltage monitoring systems.
- Overvoltage and undervoltage detection circuits.
- Electrical distribution panels and switchboards.
- Industrial machinery and equipment protection.
- AC and DC control voltage supervision.
- PLC-controlled automation and alarm systems.
- Control transformer secondary voltage monitoring.
- Battery and DC power supply monitoring.
- Manufacturing and process control equipment.
- OEM electrical control panels and industrial automation assemblies.
