Why Choose the ABB CM-ESS.2P Voltage Monitoring Relay?
The ABB CM-ESS.2P is a single-function voltage monitoring relay designed for reliable AC and DC voltage supervision in industrial control and automation systems. Supplied under ABB order code 1SVR740831R0400, this model operates from a 110–130 V AC control supply and provides four selectable measuring ranges covering 3–600 V AC/DC.
The CM-ESS.2P can be configured for either overvoltage or undervoltage monitoring and uses an RMS measuring principle for AC and DC voltages. Its selectable measuring ranges of 3–30 V, 6–60 V, 30–300 V and 60–600 V allow one compact relay to cover a broad range of industrial voltage-monitoring applications.
The relay features adjustable 3–30% hysteresis and an adjustable tripping delay from instantaneous operation to 30 s. Two changeover (SPDT) output contacts rated at 250 V / 4 A, an open-circuit operating principle and maintenance-free Easy Connect push-in terminals provide flexible integration into control panels.
Key Advantages
- Selectable overvoltage or undervoltage monitoring.
- Four measuring ranges covering 3–600 V AC/DC.
- Dedicated 110–130 V AC control supply version.
- RMS measuring principle for AC and DC voltages.
- 3–30% adjustable hysteresis supports stable switching around the threshold.
- Selectable instantaneous or adjustable 0.1–30 s tripping delay.
- Open-circuit operating principle.
- 2 changeover (SPDT) output contacts provide flexible control and signalling.
- Contacts rated at 250 V / 4 A.
- Maintenance-free Easy Connect push-in terminals simplify wiring.
- Compact 22.5 mm width conserves DIN rail space.
Key Features
- ABB CM-ESS.2P voltage monitoring relay.
- ABB order code 1SVR740831R0400.
- 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.
- 110–130 V AC rated control supply voltage.
- 3–30% adjustable hysteresis.
- 0 s or 0.1–30 s adjustable tripping delay.
- Open-circuit principle.
- 2 c/o (SPDT) output contacts.
- 250 V / 4 A contact rating.
- 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.2P compares the monitored AC or DC voltage with an adjustable threshold and changes the state of its output contacts when the configured overvoltage or undervoltage condition occurs. Four selectable measuring ranges provide coverage from 3 to 600 V, enabling the relay to handle a broad range of control, power-supply and industrial voltage-monitoring duties.
Adjustable 3–30% hysteresis helps prevent repeated switching when the measured voltage fluctuates close to the threshold, while the selectable instantaneous or 0.1–30 s tripping delay can prevent brief disturbances from triggering unnecessary control actions. The two changeover outputs provide convenient interfaces 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.
