Voltage and Frequency NPU800 / NPU800R
NPU800 / NPU800R relays ensure the monitoring of the voltages of electrical supply networks. They offer over- and under- frequency and over- and under-voltage protection across all three phases.
ANSI functions: 
59 / 27 / 27 P / 81O / 81U / 86 / 74TC

These relays are part of the NP800 range, offering multi-function protection and communication via Modbus (RS485) or Modbus TCP (Ethernet).  A full brochure is available on the NP800 range page