Monitoring Relays


Monitoring of Undervoltage

Description Part Number Price (ex VAT) Qty
VOLTAGE MONITORING 3 PHASE VOLTAGE MONITORING RELAY E3YF400VT02
£73.37
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3PH Voltage Monitoring Multifuction

Description Part Number Price (ex VAT) Qty
ART.No.2390500 VOLTAGE MONITORING RELAY 3PH 1 C/O G2PM400VSY10
£93.89
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ART.No.1341300 3 PHASE VOLTAGE MONITOR 2 C/O CONTACTS E3PF400VSY02
£94.82
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ART.NO.2390505 MULTIFUCTION MONITORING RELAY 3PH 2 C/O G2PM400VSY20.24-240V
£141.31
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Monitoring relays are a type of relay that trips a circuit breaker when a fault is detected. Monitoring relays have adjustable operating conditions, whereas normal relays switch according to a fixed threshold. They measure a given parameter, such as voltage , current , temperature or frequency and will trip a circuit breaker when the parameter gets too high or low.

Monitoring relays have a wide range of uses, depending largely on the factor being monitored. For example, they can protect against overcurrent if measuring current, or they can detect an abnormally low frequency if frequency is being measured.

Types of monitoring relay

The main way in which monitoring relays differ is the function that they measure. This can be a number of things, including:

  • voltage
  • current
  • temperature
  • frequency