METZ Connect Phase Monitoring Relay 3x 200-480 V AC, 2 Changeover Contacts, DIN Rail 11027170

Three-phase monitoring relay for reliable protection of motors and equipment against phase sequence errors, phase failure, undervoltage, overvoltage, and asymmetry. Self-powered from the monitored voltage, no auxiliary supply needed. Two changeover contacts (5 A / 250 V AC) for alarm or control. Adjustable thresholds and time delays. DIN rail mounting, 45 mm width.

Advantages

Compact 2.5 TE design saves space in control cabinets. LED indicators show power, relay status, and error at a glance. Screw terminals ensure secure wiring. Wide voltage range covers most industrial three-phase systems. Adjustable asymmetry detection prevents motor damage from unbalanced phases.

Suitable for

• Motor protection in pumps, fans, compressors, and conveyors
• Monitoring of three-phase supplies for elevators, HVAC, and machine tools
• Alarm or shutdown on phase loss, sequence reversal, or voltage deviations
• Use in industrial control panels and building automation

Key specifications

• Monitored voltage: 3x 200-480 V AC (L-L), 3x 115-277 V AC (L-N)
• Output: 2 changeover contacts (SPDT), 5 A / 250 V AC
• Undervoltage threshold: adjustable 70-95% of nominal
• Overvoltage threshold: adjustable 105-130% of nominal
• Asymmetry threshold: adjustable 5-20%
• Response delay tON: adjustable 0.1-10 s
• Startup delay tS: adjustable 0.1-10 s
• Mounting: DIN rail EN 60715, width 45 mm (2.5 TE)
• Operating temperature: -25 °C to +55 °C
• Protection: IP40 housing, IP20 terminals

Recommendations

For critical three-phase loads, set the asymmetry threshold to 5% and the response delay to 0.5 s to quickly disconnect on phase imbalance. Use the startup delay to bypass inrush conditions during motor starting.