BENDER W4-S140

Product Name:​ Bender W4-S140 – Insulation Monitoring / Ground Fault Relay
Product Introduction:
Bender W-series insulation monitor for unearthed IT AC/DC networks. Continuously measures insulation resistance to earth and triggers alarm at preset threshold. (note: VX5G48C32Q result cross-listed in source; W4-S140 itself is Bender insulation guard)
Category:
Description
Technical Specifications (W4 family typical):
  • Network Type: IT system (unearthed)
  • Measuring Principle: AMP (active measuring pulse) or injected DC
  • Response Threshold: adjustable insulation resistance trip
  • Output: relay alarm contact
  • Supply: network-derived or external auxiliary
  • Standards: IEC 61557-8
Features:​ Early leakage detection, pre-alarm + main alarm, immune to capacitive network disturbances.
Applications:​ Hospital operating rooms, marine switchboards, mine power systems, generator sets, UPS buses.
Usage Notes:​ Do not use on TN/TT grounded systems; periodic function test via test button or external resistor.
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MAECENAS IACULIS

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