Why Choose the ABB CM-ESS.1S Voltage Monitoring Relay?
The ABB CM-ESS.1S is a compact and reliable voltage monitoring relay designed for overvoltage or undervoltage supervision in industrial control and automation systems. With ABB order code 1SVR730830R0300, this single-function monitoring relay operates from a wide 24–240 V AC/DC control supply and provides dependable monitoring of both AC and DC voltages.
The CM-ESS.1S 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, while adjustable hysteresis from 3–30% of the threshold value allows the switching behaviour to be matched accurately to the application.
A single changeover (SPDT) output contact provides straightforward integration with contactors, PLC inputs, alarms and control circuits. Screw connection technology, front-mounted adjustment controls and a slim 22.5 mm housing make the CM-ESS.1S particularly suitable for installation in compact DIN-rail control panels.
Key Advantages
- Reliable overvoltage or undervoltage monitoring for industrial electrical systems.
- Wide 24–240 V AC/DC control supply simplifies application across different control voltages.
- Four selectable measuring ranges extending from 3–600 V.
- Suitable for monitoring both AC and DC voltages.
- Adjustable 3–30% hysteresis for precise switching characteristics.
- 1 c/o (SPDT) output contact for control and signalling circuits.
- Compact 22.5 mm-wide design saves DIN-rail space.
- Screw terminals provide secure and convenient field wiring.
Key Features
- ABB CM-ESS voltage monitoring relay series.
- 24–240 V AC/DC rated control supply voltage.
- Configurable overvoltage or undervoltage monitoring.
- Measuring ranges of 3–30 V, 6–60 V, 30–300 V and 60–600 V.
- RMS measuring principle for AC and DC voltage monitoring.
- 3–30% adjustable hysteresis.
- 1 c/o (SPDT) relay output.
- Output contact rated up to 250 V / 4 A.
- Open-circuit operating principle.
- Three LEDs for operating-status indication.
- Screw connection technology with double-chamber cage terminals.
- Tool-free mounting and removal from DIN rail.
Reliable Voltage Monitoring for Control Systems
Voltage monitoring relays help protect electrical equipment and automated processes against supply conditions outside an acceptable operating range. The ABB CM-ESS.1S can be configured to detect either excessive or insufficient voltage and change the state of its output relay when the selected threshold is crossed.
Its four measuring ranges provide flexibility for applications from low-voltage control circuits through to supplies of up to 600 V. Adjustable hysteresis helps prevent unwanted relay cycling around the switching threshold, while the wide AC/DC supply range and compact DIN-rail housing simplify integration into industrial control systems.
Typical Applications
- Industrial control and automation panels.
- AC and DC power supply supervision.
- Machine control and protection circuits.
- Battery and DC system voltage monitoring.
- Motor control and process equipment.
- Electrical distribution and control systems.
- Alarm and signalling circuits.
- OEM machinery and production equipment.
