Monitoring relays are a type of relay that trips a circuit breaker when a fault is detected. A relay is an electrically controlled switch that is used to turn the power on or off in a circuit.
Monitoring relays are more sophisticated than regular relays, as they have adjustable operating conditions, whereas normal relays switch according to a fixed threshold. They measure a given parameter, such as voltage or temperature, and will trip a circuit breaker when the parameter gets too high or low.
What are monitoring relays used for?
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
The factor that you need to measure will decide which monitoring relay you choose.
Description:
Schneider Electric RM17/35 UB measurement and control relays
for 3 phase supplies, monitor correct sequences of phases L1, L2 and L3. It also monitors total loss of one or more phases, asymmetry, and over and undervoltage with independent adjustments. In ...
Description:
TELE GAMMA series AC and DC voltage monitoring
relay. Multifunction monitoring in a slim easy to use package. The GAMMA series have a self-extinguishing plastic body with an IP rating of IP40. DIN Rail mountLED indicatorScrew terminals2 change over contactMultifunction. ...
Description:
Voltage monitoring for 3 phase systems3 phase mains,
50 → 400 HzArithmetic average measurementAdjustable response and fall-back valuesFor mains with or without a neutral conductorClosed circuit current principle; output relay not activated in the event of a faultLED status displaysImpervious ...
