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 RM35 UA multifunction current control relays
monitor both AC and DC currents. Featuring automatic current recognition for overcurrent and undercurrent moniotoring. Checks its own power supplyClear hinged front coverLED display of output statusDIN Rail mounting.
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:
Thermistor motor protection relay Standard evaluation unit 22.5
mm enclosure screw terminal 2 change-over contacts US = 24 V AC/DC Manul/Remote-Reset with ATEX approval 2 LEDs (READY/TRIPPED) galvanic isolation Test/reset button Wire break monitoring Short circuit monitoring.
Description:
3UG4 relays that monitor current, power factor and
active current are ideal for monitoring the load of motors and functionality of electronic loads. These devices detect the effect of wear and faults early on. This means that appropriate actions can ...
