Monitoring Relays

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.


...
Read more Read less

Filters

Viewing 1 - 20 of 659 products
Results per page
Description Price Monitoring Application Supply Voltage Contact Configuration Voltage Sensitivity Electrical Phase Voltage Sensing Range Current Sensitivity Minimum Current Sensed Maximum Current Sensed Phase Sensitivity Time Delay Temperature Sensitivity Temperature Sensing Range Frequency Sensing Range
RS Stock No. 102-6137
BrandRS PRO
SGD127.82
Each
units
Phase, Voltage 400 V ac SPDT Overvoltage, Undervoltage 3 300 → 380 (Undervoltage) V, 420 → 500 (Overvoltage) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - 48 → 63 Hz
RS Stock No. 102-6130
BrandRS PRO
SGD70.84
Each
units
Voltage 12 → 24 V dc SPDT Undervoltage 1 12 → 24 V dc - - - - 0 → 30 s - - -
RS Stock No. 102-6136
BrandRS PRO
SGD89.18
Each
units
Phase, Voltage 280 → 520 V ac SPDT Undervoltage 3 300 → 500 (Undervoltage) V - - - Phase Failure, Phase Sequence 0.2 → 10 s - - 48 → 63 Hz
RS Stock No. 102-6131
BrandRS PRO
SGD81.57
Each
units
Voltage 230 V ac SPDT Overvoltage, Undervoltage 1 173 → 218 (Undervoltage) V, 242 → 288 (Overvoltage) V - - - - 0.2 → 10 s - - 48 → 63 Hz
RS Stock No. 102-6133
BrandRS PRO
SGD95.63
Each
units
Voltage 24 → 230 V ac/dc SPDT Overvoltage, Undervoltage 1 50 → 500 V - - - - 0.1 → 30 s - - 48 → 63 Hz
RS Stock No. 102-6135
BrandRS PRO
SGD75.87
Each
units
Phase, Voltage 280 → 520 V ac SPDT Undervoltage 3 Maximum of 280 V - - - Phase Failure, Phase Sequence 100 ms - - 48 → 63 Hz
RS Stock No. 102-6134
BrandRS PRO
SGD128.28
Each
units
Current 24 → 230 V ac/dc SPDT - 1 - Overcurrent, Undercurrent 1A 10A - 0.1 → 30 s - - 48 → 63 Hz
RS Stock No. 859-3285
Mfr. Part No.PPB01CM48
SGD401.04
Each
units
Phase, Voltage 380 → 415 V ac SPDT Overvoltage, Undervoltage 3, 3+N 323 → 475 V ac - - - Phase Loss, Phase Sequence 1 s, 6 s - - -
RS Stock No. 775-7936
Mfr. Part No.1SVR730824R9300
BrandABB
SGD160.97
Each
units
Phase 200 → 500 V ac DPDT - 3 - - - - Phase Failure, Phase Sequence 500 ms - - 45 → 65 Hz
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
SGD281.57
Each
units
Phase, Voltage 160 → 690 V ac DPDT Overvoltage, Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Sequence 0.1 → 20 s - - -
RS Stock No. 146-159
Mfr. Part No.RM17UAS16
SGD178.88
Each
units
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 20 → 80 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 857-7700
Mfr. Part No.DPC01DM69
SGD635.64
Each
units
Phase, Voltage 600 → 690 V ac SPDT Overvoltage, Undervoltage 3, 3+N 510 → 793 V ac - - - Asymmetry, Phase Loss, Phase Sequence, Tolerance 1 s, 6 s - - 50 → 60 Hz
RS Stock No. 146-238
Mfr. Part No.RM17TG20
SGD172.95
Each
units
Phase 208 → 440 V ac DPDT - 3 - - - - Phase Asymmetry, Phase Failure, Phase Sequence <100 ms - - -
RS Stock No. 240-8939
Mfr. Part No.BA9043 3AC50-400Hz 230/400V
BrandDold
SGD328.90
Each
units
Voltage 230/400 V ac DPDT Undervoltage - - - - - - - - - -
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
SGD193.57
Each
units
Phase, Voltage 160 → 690 V ac DPDT Undervoltage 3 160 → 690 V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20 s - - -
RS Stock No. 776-1581
Mfr. Part No.72.01.8.240.0000
BrandFinder
SGD115.66
Each
units
Level 230 → 240 V ac SPDT - 1 - - - - - 0.5 → 7 s - - -
RS Stock No. 146-531
Mfr. Part No.RM17UBE16
SGD201.11
Each
units
Voltage 24 → 48 V ac/dc SPDT Overvoltage, Self Powered, Undervoltage 1 20 → 80 V ac/dc - - - - 0.1 → 10 s - - -
RS Stock No. 124-0193
Mfr. Part No.RM35LM33MW
SGD128.25
Each
units
Level 20.4 → 264 V ac/dc DPDT - 1 - - - - - 0.1 → 5 s - - -
RS Stock No. 857-7662
Mfr. Part No.DPA51CM44
SGD319.82
Each
units
Phase 208 → 480 V ac SPDT - 3 177 → 550 V ac - - - Phase Loss, Phase Sequence - - - -
RS Stock No. 857-7182
Mfr. Part No.DIB01CB235A
SGD347.50
Each
units
Current 115/230 V ac SPDT - 1 - Overcurrent, Undercurrent - - - 1 s, 6 s - - -
Related Products
Schneider Electric RM35 UA multifunction current control relays ...
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.
TELE GAMMA series AC and DC voltage monitoring ...
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. ...
Thermistor motor protection relay Standard evaluation unit 22.5 ...
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.
3UG4 relays that monitor current, power factor and ...
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 ...