Why Choose the ABB CM-ESS.2S Voltage Monitoring Relay?
The ABB CM-ESS.2S is a compact and reliable single-phase voltage monitoring relay designed for overvoltage or undervoltage supervision in industrial control and automation systems. With ABB order code 1SVR730831R0400, this CM-ESS series relay operates with a rated control supply voltage of 110–130 V AC and provides flexible RMS monitoring of AC and DC voltages.
The CM-ESS.2S provides four selectable measuring ranges covering 3–30 V, 6–60 V, 30–300 V and 60–600 V. It can be configured for either overvoltage or undervoltage monitoring, with adjustable hysteresis from 3–30% of the threshold value and an adjustable tripping delay from instantaneous operation to 30 s.
Two changeover (SPDT) output contacts, each with contacts rated at 250 V / 4 A, provide flexible integration with contactors, PLC inputs, alarms and other control circuits. Screw connection technology with double-chamber cage terminals and a compact 22.5 mm housing make the CM-ESS.2S particularly suitable for DIN-rail installation in industrial control panels.
Key Advantages
- Reliable overvoltage or undervoltage monitoring for electrical systems.
- 110–130 V AC rated control supply for industrial control applications.
- Four selectable measuring ranges covering 3–600 V.
- RMS measuring principle suitable for AC and DC voltages.
- Adjustable 3–30% hysteresis for application-specific switching behaviour.
- Adjustable 0 or 0.1–30 s tripping delay.
- 2 c/o (SPDT) output contacts provide flexible control and signalling.
- Compact 22.5 mm-wide housing conserves DIN-rail space.
Key Features
- ABB CM-ESS single-phase voltage monitoring relay series.
- 110–130 V AC rated control supply voltage.
- Configurable overvoltage or undervoltage monitoring.
- Selectable measuring ranges of 3–30 V, 6–60 V, 30–300 V and 60–600 V.
- RMS measuring principle for AC and DC voltages.
- 3–30% adjustable hysteresis.
- 0 or 0.1–30 s adjustable ON-delay tripping time.
- 2 c/o (SPDT) relay outputs.
- 250 V / 4 A contact rating.
- Open-circuit operating principle.
- Screw connection technology with double-chamber cage terminals.
- Compact DIN-rail mounting format.
Reliable Voltage Monitoring for Industrial Control Systems
Voltage monitoring relays help protect electrical equipment and automated processes against voltage conditions outside acceptable operating limits. The ABB CM-ESS.2S can be configured to detect either excessive or insufficient voltage and operate its two changeover outputs when the selected threshold and timing conditions are reached.
Its four measuring ranges provide flexibility for applications ranging from low-voltage control circuits through to systems requiring monitoring up to 600 V. Adjustable hysteresis helps prevent unwanted relay cycling around the switching threshold, while the adjustable tripping delay can prevent brief voltage disturbances from unnecessarily interrupting machinery or processes.
Typical Applications
- Industrial control and automation panels.
- AC and DC voltage supervision.
- Machine control and protection circuits.
- Power supply monitoring systems.
- Motor control and process equipment.
- Electrical distribution and control systems.
- Alarm and signalling circuits.
- OEM machinery and production equipment.
