1SVR730830R0500 ABB CM-ESS.MS Voltage Monitoring Relay 24–240 V AC/DC

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

The ABB CM-ESS.MS (1SVR730830R0500) is a compact and versatile multifunctional single-phase voltage monitoring relay designed to detect overvoltage and undervoltage conditions in industrial electrical systems. As part of the ABB CM-ESS voltage monitoring relay series, it provides dependable voltage supervision for electrical equipment, machinery and automation systems requiring accurate monitoring and configurable fault detection.

This monitoring relay features True RMS voltage measurement for AC and DC voltages, with four selectable measuring ranges covering 3–600 V. Its configurable overvoltage and undervoltage monitoring functions, adjustable switching threshold, hysteresis, tripping delay and start-up delay allow engineers to adapt the relay to different operating requirements. The device also supports selectable open-circuit or closed-circuit operating principles and a configurable latching function for flexible fault signalling.

With a wide 24–240 V AC/DC control supply and selectable voltage measuring ranges of 3–30 V, 6–60 V, 30–300 V and 60–600 V, the CM-ESS.MS is suitable for monitoring electrical supply conditions, control circuits and industrial equipment. Its two changeover output contacts, compact 22.5 mm housing and DIN rail mounting design enable straightforward integration into industrial electrical control panels and automation cabinets.

Key Advantages

• Versatile multifunctional single-phase voltage monitoring relay for industrial electrical systems.
• Wide 24–240 V AC/DC control supply for flexible integration with industrial control circuits.
• Four selectable voltage measuring ranges covering 3–600 V AC/DC.
• Configurable overvoltage and undervoltage monitoring functions.
• True RMS measuring principle for dependable AC and DC voltage supervision.
• Two changeover (SPDT) output contacts rated at 250 V / 4 A.
• Adjustable hysteresis from 3–30% helps prevent unwanted switching around the configured threshold.
• Adjustable tripping and start-up delays from 0.1–30 s, with instantaneous settings.
• Selectable open-circuit or closed-circuit operating principle for flexible fault signalling.
• Configurable latching function for retaining fault indication when required.
• Three LED indicators provide convenient visual operating status information.
• Compact DIN rail mounting design helps conserve space inside electrical control cabinets.
• Secure screw terminal connections simplify installation and maintenance.

Key Features

• ABB CM-ESS.M multifunctional voltage monitoring relay series.
• Manufacturer part number: 1SVR730830R0500.
• 24–240 V AC/DC rated control supply voltage.
• Four selectable voltage measuring ranges: 3–30 V, 6–60 V, 30–300 V and 60–600 V.
• True RMS measurement for AC and DC voltages.
• Selectable overvoltage or undervoltage monitoring.
• Adjustable hysteresis: 3–30% of the threshold value.
• Adjustable tripping delay: 0 s or 0.1–30 s.
• Adjustable start-up delay: 0 s or 0.1–30 s.
• Two changeover (SPDT) output contacts rated at 250 V / 4 A.
• Selectable open-circuit or closed-circuit operating principle.
• Configurable latching function for fault indication.
• Three LED indicators for operating and relay status.
• Precise adjustment using front-face operating controls.
• Double-chamber cage connection terminals with screw connections.
• 22.5 mm housing width for space-efficient installation.
• Tool-free mounting and removal from DIN rails.
• Flame-retardant housing material classified UL 94 V-0.
• Optional sealable transparent cover for protection against unauthorised adjustments.

Technical Specifications

• Manufacturer: ABB
• Series: CM-ESS.M Voltage Monitoring Relays
• Model: CM-ESS.MS
• ABB order code: 1SVR730830R0500
• ABB product group: 310921-Measuring & Monitoring Relays
• Product type: Multifunctional single-phase voltage monitoring relay
• Rated control supply voltage: 24–240 V AC/DC
• Monitoring function: Overvoltage or undervoltage
• Measuring principle: True RMS measurement for AC and DC voltages
• Measuring range 1: 3–30 V
• Measuring range 2: 6–60 V
• Measuring range 3: 30–300 V
• Measuring range 4: 60–600 V
• Hysteresis: Adjustable, 3–30% of threshold value
• Tripping delay: 0 s or adjustable 0.1–30 s
• Start-up delay: 0 s or adjustable 0.1–30 s
• Output contacts: 2 changeover (SPDT) contacts
• Contact rating: 250 V / 4 A
• UL/CSA contact rating: B300
• Maximum operating voltage (UL/CSA): 300 V AC, output circuit
• Operating principle: Selectable open-circuit or closed-circuit principle
• Latching function: Configurable, enabled or disabled
• Status indication: 3 LEDs
• Terminal type: Screw terminals with double-chamber cage connections
• Terminal tightening torque: 0.8 N·m
• Protection rating: IP50 housing / IP20 terminals
• Mounting type: DIN rail mounting
• Housing flammability classification: UL 94 V-0
• Operating ambient temperature: −20 to +60 °C
• Storage temperature: −40 to +85 °C
• Dimensions (H × W × D): 85.6 × 22.5 × 103.7 mm
• Net weight: 0.154 kg
• EAN: 4016779852173

Reliable Voltage Monitoring for Industrial Electrical Systems

Voltage monitoring relays such as the ABB CM-ESS.MS continuously supervise electrical voltage and respond when the measured value crosses a configured threshold. By detecting overvoltage or undervoltage conditions, the relay helps identify abnormal electrical supply conditions that could affect the performance, reliability or service life of connected equipment.

The CM-ESS.MS uses True RMS measurement to monitor AC and DC voltages across four selectable measuring ranges. Engineers can configure the monitoring function, voltage threshold, hysteresis and timing parameters to match the requirements of the monitored circuit. When the configured switching conditions are met, the relay changes the state of its output contacts, allowing connected control systems to activate alarms, initiate shutdown sequences or perform other protective actions.

The adjustable tripping delay and start-up delay allow engineers to select instantaneous operation or introduce a delay of up to 30 s. These functions help distinguish temporary voltage fluctuations from sustained abnormal conditions and can reduce unnecessary switching during equipment start-up. Adjustable hysteresis further improves operational stability by reducing repeated switching when the monitored voltage remains close to the configured threshold.

Unlike simpler voltage monitoring relays, the CM-ESS.MS provides selectable open-circuit and closed-circuit operating principles, together with a configurable latching function. These features allow the relay response to be adapted to different control philosophies and fault signalling requirements. Its two changeover contacts enable flexible integration with PLC inputs, contactor control circuits and industrial alarm systems.

The wide 24–240 V AC/DC control supply, compact DIN rail housing, front-mounted adjustment controls and three LED status indicators make the CM-ESS.MS a practical solution for voltage supervision in industrial automation, electrical distribution and machinery control installations.

Typical Applications

• Industrial single-phase voltage monitoring and supervision.
• Overvoltage and undervoltage detection in electrical control circuits.
• AC and DC voltage monitoring in industrial equipment.
• Electrical supply monitoring for machinery and automation systems.
• Voltage supervision in control panels and distribution cabinets.
• PLC-based monitoring and alarm signalling applications.
• Power supply condition monitoring for industrial control equipment.
• Voltage fault detection in manufacturing and production machinery.
• Monitoring of electrical supplies in pumps, fans and processing equipment.
• Electrical fault signalling with configurable latching functionality.
• Industrial control systems requiring adjustable monitoring delays.
• OEM machine building and automated control systems.