ABB – CM-ESS.2S (1SVR730831R0400) – Single-Phase Voltage Monitoring Relay

The ABB CM-ESS.2S (1SVR730831R0400) is a single-phase voltage monitoring relay designed for reliable overvoltage and undervoltage protection in industrial and commercial electrical systems. Operating with a rated control supply voltage of 110–130 V AC, this relay features two changeover (SPDT) contacts rated at 250 V / 4 A for flexible integration into control circuits.

The device supports four selectable measuring ranges (3–30 V, 6–60 V, 30–300 V, 60–600 V) using a true RMS measuring principle, ensuring precise monitoring of both AC and DC voltages. The relay is configurable for either overvoltage or undervoltage detection, with an adjustable hysteresis (3–30% of the threshold value) and a tripping delay that can be set from instantaneous up to 30 seconds. It is equipped with screw terminals and fits standard DIN rail mounting, making installation straightforward in control panels.

Key Features:

• Control supply voltage: 110–130 V AC

• Measuring ranges: 3–30 V, 6–60 V, 30–300 V, 60–600 V (AC/DC, true RMS)

• Output: 2 x SPDT (changeover) contacts, 250 V / 4 A

• Configurable for overvoltage or undervoltage monitoring

• Adjustable hysteresis: 3–30% of threshold

• Adjustable tripping delay: 0 s (instantaneous) or 0.1–30 s

• Screw terminal connections

• DIN rail mounting (22.5 mm wide)

• Degree of protection: Housing IP50, terminals IP20

• Electrical durability: 100,000 cycles (AC-12)

• Mechanical durability: 30,000,000 cycles

• Standards: IEC/EN 60255-27, UL 508, CAN/CSA C22.2 No.14