PUVR44 Three Phase Under Voltage Relay

  • Designed to withstand overloads up to 125% (cont.), 150% (10s)
  • Under voltage monitoring
  • Monitors own three phase, 4-wire supply
  • Selectable nominal voltages
  • Adjustable Trip level, Time delay and Differential
  • DPDT Relay output
  • 44mm wide, DIN Rail mount

When power is applied, the output relay will energise provided the monitored phase voltages are above the set Under voltage trip level. The relay will de-energise if any of the phase voltage decrease below the trip level. The voltage must increase above the trip level plus the set differential before the relay will re-energise.

For the purpose of testing, it is possible to use the unit on a single phase supply by linking inputs L1, L2 and L3 together.

  • Monitoring function: Under voltage
  • Monitored supply/nominal voltages : 220V, 230V, 240V, 254V, 265V, or 277V AC (Order Code: 99-4153)
  • Under trip level: 75 – 100%
  • Differential: 1 – 15%
  • Time delay: 0.5 – 10s
  • Output: DPDT 8A @ 250V (AC1)
  • Dimensions(mm): W:44 x H:85 x D:63.5

Typical applications include:

  • Generator output panels
  • Electrical distribution panels
  • Industrial power-supply panels
  • Panel-building and test facilities

Key benefits:

  • Helps protect against low supply voltage — The relay de-energises when a monitored phase falls below the adjustable under-voltage threshold, allowing an external control circuit to inhibit equipment.
  • Helps avoid unstable reconnection — The adjustable differential requires voltage to recover above the trip level by a selected margin before the relay re-energises.
  • Tolerates documented voltage overloads — The relay is designed to withstand the stated continuous and short-duration voltage overloads, helping it remain serviceable within those limits.
  • Simplifies functional testing — The documented linked-input arrangement allows testing from a single-phase supply when a three-phase test source is unavailable.
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