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NSR relay - Over- and undervoltage monitoring, 3-phase


This product is no longer available.


Overvoltage and undervoltage monitoring railway relay with two changeover contacts. Suitable for 3-phase 400 VAC 50 Hz. Auxiliary power supply necessary, either DC or AC (0-60 Hz). When the relay is activated there is a delay on pull-in.
The delay time is adjustable with a lockable knob. The detection for overvoltage and undervoltage is also adjustable with a lockable knob.
The NSR-relay has a fail-safe circuit: an auxiliary supply failure is detected. A phase rotation error is detected as well.
The construction of the relay and choice of materials makes the NSR-relay suitable to withstand corrosive atmospheres, low and high temperatures, shock & vibrating and dry to very humid environments. No external socket necessary, the relay can be mounted directly on a 35 mm rail without extra fasteners, or on any surface via 2 screws.


These relay series are designed for rolling stock applications. The NSR-relay is used in applications for overvoltage and undervoltage monitoring in a 3-phase network.


  • Overvoltage and undervoltage monitoring relay with delay on pull-in
  • 3-phase 400 VAC input (50 Hz)
  • 2 C/O contacts
  • Overvoltage and undervoltage adjustable via lockable knobs
  • Overvoltage adjustment: 100 - 130%
  • Undervoltage adjustment: 70 - 100%
  • Delay time adjustable via lockable knob
  • Time delay range: 0.5 - 10 s
  • Auxiliary power supply necessary
  • Phase rotation error and auxiliary power
  • supply failure also detected
  • Screw terminals
  • Mounting on 35 mm rail
  • Mounting on any surface via 2 screws


  • Proven reliable
  • Long term availability
  • Easy to maintain
  • Low life cycle cost
  • No maintenance

Railway compliancy

  • EN 50155 - Electronic equipment used on rolling stock for railway applications
  • IEC 60571 - Electronic equipment used on railway vehicles
  • IEC 60077 - Electrical equipment for rolling stock in railway applications
  • IEC 60947 - Low voltage switch gear and control gear
  • IEC 61373 - Rolling stock equipment - Shock and vibration test
  • IEC 60947-5-4 - Electromechanical components for control applications
  • EN 50121 - Electromagnetic compatibility for railway applications

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Railway rolling stock
Railway signalling