RS PRO 3 Phase Undervoltage Monitoring Relay, SPDT Contact, DIN Rail Mounting 223-7788

RS PRO 223-7788 is a high-performance 3 Phase Undervoltage Monitoring Relay equipped with SPDT contact configuration and designed for DIN rail mounting. It operates on a supply AC voltage of 0V ac and ensures comprehensive monitoring and protection of three-phase electrical systems in industrial, automation, and commercial applications.

This digital voltage monitoring relay delivers true RMS measurements at a 2kHz sampling rate, enabling accurate detection of electrical parameters. It offers extensive protection features including monitoring against phase loss, phase sequence faults, phase asymmetry, under-voltage, over-voltage, neutral faults, as well as over and under frequency conditions. The device can be configured for use with either 3-Phase 3-Wire or 3-Phase 4-Wire supply systems with voltage ranges between 145-500 VAC (DMA220 variant supports 50-500VAC).

The front panel is outfitted with an LCD display featuring green backlight that shows fault windows, menu parameters, line or phase voltages, delay timer status, time in seconds, percentage asymmetry, frequency in Hz, instantaneous voltage, and relay status for easy monitoring and configuration.

Key operational features include an adjustable ON-OFF time delay for relay activation, dual 5 amp relay outputs with independent programming, password protection to secure settings, and the ability to log the last five fault events for enhanced diagnostics. The relay supports both fail-safe and non-fail-safe configurations along with manual-reset (latch) and auto-reset (non-latch) alarm modes.

This model stands out for its rugged design with IP20 and IP40 ingress protection ratings and screw terminal connections, making it ideal for secure installation in switchgear, control gear, machine control systems, and mains distribution setups.

Provides adjustable ON-OFF time delay for precise control. Features LCD display with green backlight for clear status indication. Measures true RMS waveform sampled at 2kHz frequency. Protects against phase loss, phase sequence errors, and phase asymmetry.

Monitors under-voltage, over-voltage, neutral fault, and frequency variations. Configurable for 3-Phase 3-Wire or 3-Phase 4-Wire supplies spanning 145-500 VAC. Equipped with two independent 5A single and dual relay outputs.

Provides password protection to prevent unauthorized parameter changes. Logs the last five faults for improved system diagnostics. Supports latch (manual-reset) and non-latch (auto-reset) alarm modes.

This monitoring relay is widely applied in industrial automation, electrical switchgear, machine control, and electrical distribution sectors where reliable voltage and fault detection is critical. It offers excellent protection for maintaining uptime and safety in electrical systems.

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