METZ DUWC12 Phase Monitoring Relay 3N 400/230 V (110271)

The METZ DUWC12 is a compact three-phase monitoring relay engineered for 3N AC 400/230 V networks. It tracks phase sequence, phase loss, undervoltage, overvoltage and asymmetry, triggering an alarm or disconnecting the load when parameters drift outside configured limits. Adjustable response and recovery delays prevent nuisance tripping, while two potential-free changeover contacts allow flexible integration into control circuits.

Overview

Designed for DIN rail mounting (TS35), the DUWC12 occupies just three module widths, making it ideal for space-constrained control cabinets. Its clear LED indicators show phase status, relay state and error type, enabling fast diagnostics. The unit operates across a wide temperature range and offers screw terminals for straightforward wiring.

What stands out

• Monitoring of phase sequence, phase failure, undervoltage, overvoltage and asymmetry in one relay
• Adjustable undervoltage threshold (70–95% of Un) and overvoltage threshold (105–130% of Un)
• Asymmetry detection adjustable from 5% to 20%
• Response and recovery delays configurable between 0.1 and 10 seconds
• Two changeover contacts rated at 5 A / 250 V AC for versatile switching
• LED indicators for quick operational feedback

Technical details

• Product Type: Phase Monitoring Relay
• Nominal Voltage (Un): 3N AC 400/230 V
• Frequency: 50/60 Hz
• Output Contacts: 2 × Changeover (SPDT)
• Contact Rating: 5 A / 250 V AC (AC1)
• Mounting: DIN Rail TS35, 3 TE (approx. 54 mm)
• Connection: Screw Terminals
• Protection Class: IP40 (housing), IP20 (terminals)
• Operating Temperature: -25°C to +55°C

Our verdict

A robust, adjustable phase monitoring relay that delivers comprehensive three-phase protection in a compact DIN-rail form. Ideal for OEMs, panel builders and maintenance teams seeking reliable machine and installation safeguarding.