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 and frequency.


The factor that you need to measure will decide which monitoring relay you choose.


...
Read more Read less

Filters

Viewing 1 - 20 of 109 products
Results per page
Description Price Monitoring Application 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 Current Range
RS Stock No. 518-7297
Mfr. Part No.3UG4513-1BR20
BrandSiemens
£99.42
Each
Units
Phase, Voltage DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - - -
RS Stock No. 518-7168
Mfr. Part No.3UG4622-1AW30
BrandSiemens
£112.68
Each
Units
Current SPDT - 1 - Overcurrent, Undercurrent 50mA 10A - 0.1 → 20s - - - 0.05 → 10A
RS Stock No. 758-6924
Mfr. Part No.3UG4512-1AR20
BrandSiemens
£74.90
Each
Units
Phase SPDT - - 160 → 690V ac - - - Phase Failure, Phase Sequence - - - - -
RS Stock No. 518-7174
Mfr. Part No.3UG4615-1CR20
BrandSiemens
£144.49
Each
Units
Phase, Voltage DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - - -
RS Stock No. 392-7267
Mfr. Part No.3RN1010-1CB00
BrandSiemens
£74.60
Each
Units
Thermistor motor protection relay SPDT - - - - - - - - Overtemperature, Undertemperature +60 → +180°C - -
RS Stock No. 518-7051
Mfr. Part No.3UG4614-1BR20
BrandSiemens
£111.35
Each
Units
Phase, Voltage DPDT Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - - -
RS Stock No. 518-7275
Mfr. Part No.3UG4511-1BP20
BrandSiemens
£78.21
Each
Units
Phase DPDT - 3 - - - - Phase Sequence - - - - -
RS Stock No. 758-6946
Mfr. Part No.3UG4633-1AL30
BrandSiemens
£108.04
Each
Units
Voltage SPDT Overvoltage, Undervoltage - 17 → 275V ac/dc - - - - 0.1 → 20s - - - -
RS Stock No. 758-6942
Mfr. Part No.3UG4632-1AW30
BrandSiemens
£112.68
Each
Units
Voltage SPDT Overvoltage, Undervoltage - 10 → 600V ac/dc - - - - 0.1 → 20s - - - -
RS Stock No. 758-6955
Mfr. Part No.3UG4641-1CS20
BrandSiemens
£154.43
Each
Units
Current DPDT - - - No Current, Overcurrent, Undercurrent 0.2A 10A - 0.1 → 20s - - - -
RS Stock No. 518-7102
Mfr. Part No.3UG4632-1AA30
BrandSiemens
£104.06
Each
Units
Voltage SPDT Overvoltage, Undervoltage 1 10 → 600V ac/dc - - - - 0.1 → 20s - - - -
RS Stock No. 758-6927
Mfr. Part No.3UG4501-1AW30
BrandSiemens
£76.88
Each
Units
- SPDT - - - - - - - 0.3 → 10s - - - -
RS Stock No. 518-7180
Mfr. Part No.3UG4617-1CR20
BrandSiemens
£166.36
Each
Units
Phase, Voltage DPDT Overvoltage, Undervoltage 3 160 → 690V ac - - - Phase Failure, Phase Imbalance, Phase Sequence 0.1 → 20s - - - -
RS Stock No. 418-4988
Mfr. Part No.3RS1040-1GW50
BrandSiemens
£259.82
Each
Units
Temperature DPDT - - - - - - - 0 → 999s Overtemperature, Undertemperature -50 → +500°C - -
RS Stock No. 772-1215
Mfr. Part No.5SV8000-6KK
BrandSiemens
£247.26
Each
Units
Current - - - - Residual 30mA 5A - 0.02 → 5s - - - 0.3 → 5A
RS Stock No. 518-7124
Mfr. Part No.3UG4621-1AW30
BrandSiemens
£112.68
Each
Units
Current SPDT - 1 - Overcurrent, Undercurrent 3mA 500mA - 0.1 → 20s - - - 3 → 500mA
RS Stock No. 860-8693
Mfr. Part No.5TT3421
BrandSiemens
£75.35
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 758-6930
Mfr. Part No.3UG4622-2AW30
BrandSiemens
£119.97
Each
Units
Current SPDT - - - Overcurrent, Undercurrent 50mA 15A - 0.1 → 20s - - - -
RS Stock No. 758-6933
Mfr. Part No.3UG4614-2BR20
BrandSiemens
£119.30
Each
Units
Phase DPDT - - 160 → 690V ac - - - Phase Failure, Phase Sequence 0.1 → 20s - - - -
RS Stock No. 463-5543
Mfr. Part No.3RS1101-1CK30
BrandSiemens
£120.63
Each
Units
Temperature SPDT - - - - - - - - Overtemperature 0 → +600°C - -