Dold RL9877.11/120/61 3/N AC80-230/, Phase monitor, sku: 0066881

The measuring relays RN 9877 and RL 9877 of the VARIMETER series monitor overvoltage, undervoltage, voltage range, phase asymmetry and phase sequence in 3-phase or single-phase systems. The measurement is very simple and without extensive wiring as there is no auxiliary power supply necessary. The monitoring functions are easily selectable using a single turn switch without complex menu structure. The early detection of up-coming break downs and preventive maintenance avoid expensive damages. As user you profit from the reliability and availability of your plant.

• According to IEC/EN 60255-1
• For monitoring of AC 3- and single-phase with 50 /60 Hz
• Detection of
  - Overvoltage
  - Undervoltage
  - Voltage range excess
  - Phase failure
  - Phase asymmetry
  - Missing neutral e.g. broken neutral wire
  - And phase sequence in 3-phase systems
• With or without neutral
• Without separately auxiliary voltage (internal supply from all 3 phases)
• Output: 1 changeover contact
• De-energized on trip
• Adjustable hysteresis for reset
• Adjustable switching delay
• Fast fault detection
• Width:
  - RL 9877: 35 mm
  - RN 9877: 52.5 mm