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Monitoring Relays

pMonitoring 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. /p pbr/p pMonitoring 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. /p pbr/p pstrongWhat are monitoring relays used for?/strong/p pMonitoring 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./p pbr/p pstrongTypes of monitoring relay/strong/p pThe main way in which monitoring relays differ is the function that they measure. This can be a number of things, including:/p ul livoltage/li licurrent/li litemperature/li lifrequency/li /ul pThe factor that you need to measure will decide which monitoring relay you choose./p

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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
Siemens 3RN2 Thermistor motor temperature protection Monitoring Relay With DPDT Contacts, 24 V ac/dc
RS Stock No. 175-2294
Mfr. Part No.3RN2013-2BA30
BrandSiemens
£126.49
Each
Units
 Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
Omron K8DT-VW Voltage Monitoring Relay With SPDT Contacts, 100 → 240 V ac, 1 Phase
RS Stock No. 111-3119
Mfr. Part No.K8DT-VW3CA
BrandOmron
£92.60
Each
Units
 Voltage 100 → 240 V ac SPDT Overvoltage, Undervoltage 1 20 → 200 V, 30 → 300 V, 60 → 600 V - - - - 250 ms - - -
Lovato PMV30 Voltage Monitoring Relay With SPDT Contacts, 600 V ac, 3 Phase
RS Stock No. 916-0101
Mfr. Part No.PMV30A600
BrandLovato
£111.95
Each
Units
 Voltage 600 V ac SPDT Self Powered 3 Maximum of 400 V ac - - - - 0.1 → 20 s - - -
Lovato PMV40 Voltage Monitoring Relay With SPDT Contacts, 600 V ac, 3 Phase
RS Stock No. 916-0117
Mfr. Part No.PMV40A600
BrandLovato
£133.38
Each
Units
 Voltage 600 V ac SPDT Self Powered 3 Maximum of 400 V ac - - - - 0.1 → 20 s - - -
Siemens 3RN2 Thermistor motor temperature protection Monitoring Relay With DPDT Contacts, 24 V ac/dc
RS Stock No. 175-2285
Mfr. Part No.3RN2012-1BA30
BrandSiemens
£97.43
Each
Units
 Thermistor motor temperature protection 24 V ac/dc DPDT Motor Voltage - - - - - - - - - -
Phoenix Contact Current Monitoring Relay
RS Stock No. 181-2033
Mfr. Part No.2903242
BrandPhoenix Contact
£170.91
Each
Units
 Current - - - - - - 0A 20A - - - - -
Eaton EMR6 Phase, Voltage Monitoring Relay, 180 → 280 V ac
RS Stock No. 179-3536
Mfr. Part No.EMR6-AWN280-D-1
BrandEaton
£145.86
Each
Units
 Phase, Voltage 180 → 280 V ac - - - 180 → 280 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
Broyce Control Phase, Voltage Monitoring Relay With DPDT Contacts, 400 V, 3 Phase
RS Stock No. 135-6182
Mfr. Part No.LPMP/2 400V
BrandBroyce Control
£77.70
Each
Units
 Phase, Voltage 400 V DPDT - 3 243 → 540 V - - - Phase Asymmetry, Phase Failure, Phase Sequence 0.2 → 10 s - - -
Siemens 3RN2 Thermistor motor temperature protection Monitoring Relay With DPDT Contacts, 240 V ac/dc
RS Stock No. 175-2293
Mfr. Part No.3RN2013-1GW30
BrandSiemens
£143.36
Each
Units
 Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
Eaton EMR6 Phase, Voltage Monitoring Relay, 180 → 280 V ac
RS Stock No. 179-3535
Mfr. Part No.EMR6-AWN280-K-1
BrandEaton
£93.05
Each
Units
 Phase, Voltage 180 → 280 V ac - - - 180 → 280 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
Siemens 3RN2 Thermistor motor temperature protection Monitoring Relay With DPDT Contacts, 240 V ac/dc
RS Stock No. 175-2292
Mfr. Part No.3RN2013-1BW30
BrandSiemens
£133.22
Each
Units
 Thermistor motor temperature protection 240 V ac/dc DPDT Motor Voltage - 24 → 240 V ac/dc - - - - - - - -
Eaton EMR6 Phase, Voltage Monitoring Relay, 90 → 170 V ac
RS Stock No. 179-3534
Mfr. Part No.EMR6-AWN170-E-1
BrandEaton
£81.66
Each
Units
 Phase, Voltage 90 → 170 V ac - - - 90 → 170 V ac - - - - 0.1 → 30 s - - 50 → 60 Hz
ANALOG MONITORING RELAY PHASE SEQUENCE M
RS Stock No. 2508375337
Mfr. Part No.3UG4511-1AP20
BrandSiemens
£64.23
Each
Units
 - - - - - - - - - - - - - -
TEMPERATURE MONITORING RELAY FOR PT100,
RS Stock No. 2508278725
Mfr. Part No.3RS1000-1CK00
BrandSiemens
£106.05
Each
Units
 - - - - - - - - - - - - - -
Phase sequence relay 200..500V
RS Stock No. 2508225339
Mfr. Part No.221784
BrandEaton
£79.22
Each
Units
 - - - - - - - - - - - - - -
THERMISTOR MOTOR PROTECTION STANDARD EVA
RS Stock No. 2508279425
Mfr. Part No.3RN1010-2CW00
BrandSiemens
£77.55
Each
Units
 - - - - - - - - - - - - - -
DIGITAL MONITORING RELAY FOR THREE-PH. V
RS Stock No. 2508375983
Mfr. Part No.3UG4618-1CR20
BrandSiemens
£164.37
Each
Units
 - - - - - - - - - - - - - -
ANALOG MONITORING RELAY PHASE SEQUENCE M
RS Stock No. 2508375359
Mfr. Part No.3UG4511-1BN20
BrandSiemens
£74.23
Each
Units
 - - - - - - - - - - - - - -
DIGITAL MONITORING RELAY VOLTAGE MONITOR
RS Stock No. 2508376071
Mfr. Part No.3UG4631-1AW30
BrandSiemens
£106.71
Each
Units
 - - - - - - - - - - - - - -
TEMPERATURE MONITORING RELAY FOR PT100,
RS Stock No. 2508118941
Mfr. Part No.3RS1020-1DW20
BrandSiemens
£178.29
Each
Units
 - - - - - - - - - - - - - -
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