1SVR740831R1300 ABB CM-ESS.1P Voltage Monitoring Relay 220–240 V AC

Why Choose the ABB CM-ESS.1P Voltage Monitoring Relay?

The ABB CM-ESS.1P is a compact single-phase voltage monitoring relay designed for reliable AC and DC voltage supervision in industrial control and automation systems. Supplied under ABB order code 1SVR740831R1300, this version operates from a 220–240 V AC control supply and provides four selectable measuring ranges covering 3–600 V AC/DC.

The CM-ESS.1P can be configured for either overvoltage or undervoltage monitoring and uses an RMS measuring principle for AC and DC voltages. Its four selectable measuring ranges — 3–30 V, 6–60 V, 30–300 V and 60–600 V — enable one compact relay to supervise a broad range of industrial voltage circuits.

An adjustable 3–30% hysteresis helps provide stable switching around the selected threshold, while the relay operates according to the open-circuit principle. One changeover (SPDT) output contact rated at 250 V / 4 A, three status LEDs and maintenance-free Easy Connect push-in terminals provide straightforward integration into industrial control panels.

Key Advantages

• Selectable overvoltage or undervoltage monitoring.
• Four measuring ranges covering 3–600 V AC/DC.
• Dedicated 220–240 V AC control supply version.
• RMS measuring principle for AC and DC voltage supervision.
• 3–30% adjustable hysteresis supports stable switching around the threshold.
• Open-circuit operating principle.
• 1 changeover (SPDT) output contact for signalling or control.
• Output contact rated at 250 V / 4 A.
• Three LEDs provide clear status indication.
• Maintenance-free Easy Connect push-in terminals simplify wiring.
• Compact 22.5 mm width conserves DIN rail space.

Key Features

• ABB CM-ESS.1P voltage monitoring relay.
• ABB order code 1SVR740831R1300.
• Overvoltage or undervoltage monitoring, configurable.
• Suitable for monitoring AC and DC voltages.
• 3–30 V measuring range.
• 6–60 V measuring range.
• 30–300 V measuring range.
• 60–600 V measuring range.
• 220–240 V AC rated control supply voltage.
• 3–30% adjustable hysteresis.
• Open-circuit principle.
• 1 c/o (SPDT) output contact.
• 250 V / 4 A output contact rating.
• Three LED indicators for operational status.
• Easy Connect push-in terminal technology.
• Sealable transparent protective cover available as an accessory.

Flexible AC/DC Overvoltage and Undervoltage Monitoring

The ABB CM-ESS.1P compares the monitored AC or DC voltage with an adjustable threshold and changes the state of its output contact when the configured overvoltage or undervoltage condition occurs. Its four selectable measuring ranges provide coverage from 3 to 600 V, allowing one relay to handle numerous control, power-supply and industrial voltage-monitoring duties.

The adjustable 3–30% hysteresis helps prevent repeated switching when the monitored voltage fluctuates close to the threshold. Combined with precise front-face adjustment, three LED indicators, Easy Connect terminals and its dedicated 220–240 V AC control supply, the CM-ESS.1P provides a practical monitoring interface for alarms, contactors and automation systems.

Typical Applications

• Industrial AC and DC voltage supervision.
• Control circuit voltage monitoring.
• Power supply monitoring.
• Battery and DC circuit supervision.
• Industrial machinery and automation systems.
• Electrical control and distribution panels.
• Overvoltage alarm and protection circuits.
• Undervoltage alarm and protection circuits.