LPPI Phase Presence/Sequence Monitoring Relay

  • Phase sequence/failure indicator
  • Detects incorrect phase sequence and phase loss
  • 17.5mm wide, DIN Rail mount

The product monitors it’s own three-phase supply and indicates the status of each connected phase along with whether the phase sequence is correct or not. If a phase is lost, the corresponding phase present LED extinguishes and colour of the status LED changes from green “Correct” to red “Incorrect”. If the phase sequence is reversed, only the status LED changes from green “Correct” to red “Incorrect”.

 

 

  • Monitoring function: Phase presence/sequence
  • Monitored supply voltage: 320 – 490VAC (Order Code: 99-4001)
  • Phase present indication for L1, L2, L3 = Green LED (x3)
  • Phase sequence/fault status: Green/Red bi-colour LED (x1)
  • Dimensions(mm): W:17.5 x H:89 x D:59
Distributors Stock Code Link
RS Components 206-1444 Go to product
Farnell 4825120 Go to product

Typical applications include:

  • Electrical switchboards
  • Distribution panels
  • Machine control panels
  • Generator connection panels

Key benefits:

  • Makes missing phases visible — Individual green LEDs show the presence of L1, L2 and L3, helping maintenance staff identify an absent phase.
  • Supports phase-order checks — The bi-colour status LED distinguishes correct and incorrect phase sequence, supporting connection checks during commissioning.
  • Helps focus fault investigation — The combination of individual phase LEDs and a common status LED helps distinguish a missing phase from a reversed sequence.
  • Fits compact panel layouts — The 17.5mm DIN rail housing provides permanent phase-status indication while using limited panel space.
VIDEO HERE
Download datasheet