M1TVR-4W Under Voltage Monitoring Relay

  • Under voltage monitoring
  • Monitors own three phase, 4-wire supply
  • Fixed Trip level
  • Adjustable Restart time delay
  • Includes commissioning mode feature
  • SPDT Relay output
  • 17.5mm wide, DIN Rail mount

When power is applied, the output relay will energise after the set time delay provided the monitored voltage is above the fixed Under voltage trip level. The relay will de-energise if the voltage on one or more of the phases decreases below the trip level.

The commissioning mode allows the internal relay to energise immediately and avoids the minimum 5 minute waiting period.

  • Monitoring function: Under voltage
  • Monitored supply voltage: 230V AC L>N (Order Code: 99-4152)
  • Under trip level: 75%
  • Hysteresis: ≈2%
  • Restart time delay: 5 – 10m
  • Output: SPDT 6A @ 250V (AC1)
  • Dimensions(mm): W:17.5 x H:89 x D:66.5

Typical applications include:

  • Packaged air-conditioning units
  • Central air-conditioning plant
  • Refrigeration compressor panels
  • Industrial chiller installations

Key benefits:

  • Helps inhibit operation on a weak supply — The fixed under-voltage threshold releases the relay if one or more monitored phase voltages fall below the limit.
  • Provides a deliberate restart interval — The adjustable 5–10 minute delay keeps the relay de-energised before supply permission is restored.
  • Reduces commissioning waiting time — Commissioning mode allows the relay to energise immediately, avoiding the normal minimum five-minute waiting period during checks.
  • Responds to incomplete four-wire supplies — Documented phase and neutral-loss detection can remove the external control permissive when the incoming supply is incomplete.
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