ASCO Model 277 (Islatrol™ IE) Surge Protective Device

ASCO Model 277 (Islatrol™ IE) Surge Protective Device | FrontView

The ASCO Model 277 (Islatrol™ IE) is a series-connected DIN or flange mounted high frequency noise filter and surge suppressor. Its ideal applications include critical industrial loads drawing up to 20 Amps of continuous current, while typical applications include any microprocessor-based products, including industrial PLCs, OEM applications, and motion control systems.


  • Surge current capacity – 45,000 Amps
  • Transient protection in all modes: line to neutral, line to ground, and neutral to ground
  • LED status indication and form C contact for remote indication
  • DIN mountable enclosure
  • UL 1449, 1283, CUL recognized, CE


  • Multi-staged design, combining a unique hybrid clamping network with the active tracking technology of the ASCO SERIES 200 (Islatrol® family)
  • 5 year warranty