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 BA10 measurement and control relay
monitors single phase and 3 phase pumps. It controls the sequence of phases L1, L2 and L3, the loss of one or more phases, and under and overcurrent. Checks its own power ...
Description:
Schneider Electric RM35 TM relays for measurement and
control of motor temperature. The relays monitor sequence of phases L1, L2 and L3, phase loss and motor temperature over the 3 phase networks via PTC probes. The two functions "phases" and ...
Description:
Schneider Electric RM35 TF 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. Checks ...
Description:
Schneider Electric Zelio RM22T series multifunction three phase
voltage control relays. The RM22T series monitor phase sequence and phase loss. Sealable front cover to help protect settingsDiagnostic button for load circuit testingRelay output status LEDFault detection indication LEDDial pointer LED ...
