Monitoring Relays

  • What are Monitoring Relays?

    Monitoring relays are electrical devices that are used to monitor various parameters in a power system, such as voltage, current, temperature, and frequency, and trigger an alarm or action if the values go beyond a preset threshold. They are designed to detect abnormal operating conditions in a system and alert operators or take corrective action to pre...

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RS PRO Current Monitoring Relay, Single Phase, 150 → 260V ac, DIN Rail
RS PRO Current Monitoring Relay, Single Phase, 150 → 260V ac, DIN Rail
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RS Stock No.: 132-174Brand: RS PRO

€ 30.50

€ 30.50 Each (Exc. Vat)

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Available in multiples of 1
1€ 30.50
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RS Pro
Current
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Single
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150 → 260V ac
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DIN Rail
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RS PRO Current Monitoring Relay, Three Phase, 1NO/1NC, DIN Rail Mount
RS PRO Current Monitoring Relay, Three Phase, 1NO/1NC, DIN Rail Mount
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RS Stock No.: 434-506Brand: RS PRO

€ 60.37

€ 60.37 Each (Exc. Vat)

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Available in multiples of 1
1€ 60.37
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RS Pro
Current
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Three
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1NO/1NC
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DIN Rail Mount
40A
100A
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0.1 → 20s
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44 x 84.5 x 75mm
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-20 to 55°C
Error Delay Time Adjustable
-20°C
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CE
40 → 100A
84.5mm
55°C
44mm
75mm
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RS PRO Liquid Level Monitoring Relay, Single Phase, 150 → 260V ac, DIN Rail
RS PRO Liquid Level Monitoring Relay, Single Phase, 150 → 260V ac, DIN Rail
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RS Stock No.: 132-171Brand: RS PRO

€ 27.99

€ 27.99 Each (Exc. Vat)

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1€ 27.99
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RS Pro
Liquid Level
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Single
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150 → 260V ac
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DIN Rail
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RS PRO Phase Monitoring Relay, Three Phase, 150 → 260V ac, DIN Rail
RS PRO Phase Monitoring Relay, Three Phase, 150 → 260V ac, DIN Rail
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RS Stock No.: 122-217Brand: RS PRO

€ 13.80

€ 13.80 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 13.80
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RS Pro
Phase
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Three
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-
150 → 260V ac
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DIN Rail
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RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
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RS Stock No.: 122-216Brand: RS PRO

€ 18.95

€ 18.95 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 18.95
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RS Pro
Phase
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Three
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380V ac
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DIN Rail
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RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
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RS Stock No.: 132-172Brand: RS PRO

€ 18.82

€ 18.82 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 18.82
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RS Pro
Phase
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Three
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380V ac
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DIN Rail
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RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
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RS Stock No.: 132-173Brand: RS PRO

€ 23.59

€ 23.59 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 23.59
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RS Pro
Phase
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Three
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380V ac
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DIN Rail
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RS PRO Phase, Voltage Monitoring Relay, Single Phase, CO, 270 → 370, 410 → 510V ac, DIN Rail
RS PRO Phase, Voltage Monitoring Relay, Single Phase, CO, 270 → 370, 410 → 510V ac, DIN Rail
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RS Stock No.: 558-898Brand: RS PRO

€ 54.34

€ 54.34 Each (Exc. Vat)

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Available in multiples of 1
1€ 54.34
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RS Pro
Voltage
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1
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CO
150 → 300V ac
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Overvoltage, Undervoltage
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DIN Rail
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Screw
CE, cULus, DEKRA, IEC, IQNet, ISO EN 9000
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RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, 150 → 210, 240 → 300V ac, DIN Rail
RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, 150 → 210, 240 → 300V ac, DIN Rail
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RS Stock No.: 558-901Brand: RS PRO

€ 53.96

€ 53.96 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 53.96
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RS Pro
Voltage
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1
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CO
150 → 300V ac
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Overvoltage, Undervoltage
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DIN Rail
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Screw
CE, cULus, DEKRA, IEC, IQNet, ISO EN 9000
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RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, DIN Rail
RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, DIN Rail
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RS Stock No.: 558-892Brand: RS PRO

€ 46.31

€ 46.31 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 46.31
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RS Pro
Voltage
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3
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CO
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Voltage Asymmetry
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DIN Rail
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Screw
CE, cULus, DEKRA, IEC, IQNet, ISO EN 9000
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RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, DIN Rail
RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, DIN Rail
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RS Stock No.: 558-897Brand: RS PRO

€ 39.28

€ 39.28 Each (Exc. Vat)

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Available in multiples of 1
1€ 39.28
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RS Pro
Voltage
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3
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CO
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Voltage Asymmetry
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DIN Rail
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Screw
CE, cULus, DEKRA, IEC, IQNet, ISO EN 9000
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RS PRO Voltage Monitoring Relay, Single Phase, 1NO, 120 → 300V ac, DIN Rail Mount
RS PRO Voltage Monitoring Relay, Single Phase, 1NO, 120 → 300V ac, DIN Rail Mount
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RS Stock No.: 434-521Brand: RS PRO

€ 55.09

€ 55.09 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 55.09
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RS Pro
Voltage
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Single
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-
1NO
120 → 300V ac
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Overvoltage
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DIN Rail Mount
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0.1 → 600s
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52.9 x 67.5 x 90.3mm
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-20 to 55°C
Built-In Current Transformer, Built-In Contactor
-20°C
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CE
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67.5mm
55°C
52.9mm
90.3mm
300V
120V
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RS PRO Voltage Monitoring Relay, Single Phase, 220V ac, DIN Rail
RS PRO Voltage Monitoring Relay, Single Phase, 220V ac, DIN Rail
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RS Stock No.: 122-210Brand: RS PRO

€ 21.59

€ 21.59 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 21.59
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RS Pro
Voltage
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Single
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220V ac
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DIN Rail
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RS PRO Voltage Monitoring Relay, Single Phase, 220V ac, DIN Rail
RS PRO Voltage Monitoring Relay, Single Phase, 220V ac, DIN Rail
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RS Stock No.: 122-215Brand: RS PRO

€ 28.86

€ 28.86 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 28.86
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RS Pro
Voltage
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Single
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220V ac
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DIN Rail
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RS PRO Voltage Monitoring Relay, Three Phase, 1NO/1NC, 230 → 460V ac, DIN Rail or Panel
RS PRO Voltage Monitoring Relay, Three Phase, 1NO/1NC, 230 → 460V ac, DIN Rail or Panel
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RS Stock No.: 434-520Brand: RS PRO

€ 43.80

€ 43.80 Each (Exc. Vat)

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Available in multiples of 1
1€ 43.80
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RS Pro
Voltage
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-
Three
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-
1NO/1NC
230 → 460V ac
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Overvoltage
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DIN Rail or Panel
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Phase Loss
0.1 → 10s
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44 x 84.5 x 75mm
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-20 to 55°C
Phase Sequence Control, With PTC, Non-Neutral
-20°C
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CE
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84.5mm
55°C
44mm
75mm
460V
230V
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RS PRO Voltage Monitoring Relay, Three Phase, 380V ac, DIN Rail
RS PRO Voltage Monitoring Relay, Three Phase, 380V ac, DIN Rail
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RS Stock No.: 122-212Brand: RS PRO

€ 25.35

€ 25.35 Each (Exc. Vat)

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Available in multiples of 1
1€ 25.35
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RS Pro
Voltage
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Three
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-
380V ac
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DIN Rail
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RS PRO Voltage Monitoring Relay, 1 Phase, SPDT, 12 → 24V dc, DIN Rail
RS PRO Voltage Monitoring Relay, 1 Phase, SPDT, 12 → 24V dc, DIN Rail
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RS Stock No.: 102-6130Brand: RS PRO

€ 81.58

€ 81.58 Each (Exc. Vat)

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Available in multiples of 1
1€ 81.58
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RS Pro
Voltage
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-
1
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-
SPDT
12 → 24V dc
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Undervoltage
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-
DIN Rail
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0 → 30s
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L
17.5 x 66.5 x 89mm
1
+60°C
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-20°C
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Screw
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-
17.5mm
+60°C
66.5mm
89mm
24V dc
12V dc
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RS PRO Phase, Voltage Monitoring Relay, 3 Phase, SPDT, DIN Rail
RS PRO Phase, Voltage Monitoring Relay, 3 Phase, SPDT, DIN Rail
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RS Stock No.: 102-6136Brand: RS PRO

€ 89.10

€ 89.10 Each (Exc. Vat)

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1

Available in multiples of 1
1€ 89.10
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RS Pro
Phase, Voltage
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3
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SPDT
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Undervoltage
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-
DIN Rail
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Phase Failure, Phase Sequence
0.2 → 10s
48 → 63Hz
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L
17.5 x 66.5 x 89mm
1
+60°C
2 LEDs for the Indication of Operational States, Adjustment for Time Delay, Adjustment for Undervoltage Trip Level, Detects Incorrect Phase Sequence & Phase Loss, Measures Phase to Phase Voltages, Microprocessor Based Relay, Monitors Own Supply & Detects an Undervoltage Condition on One or more Phases, True RMS Monitoring
-20°C
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Screw
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17.5mm
+60°C
66.5mm
89mm
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RS PRO Phase Monitoring Relay, 3 Phase, SPDT, DIN Rail
RS PRO Phase Monitoring Relay, 3 Phase, SPDT, DIN Rail
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RS Stock No.: 223-7792Brand: RS PRO

€ 128.01

€ 128.01 Each (Exc. Vat)

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1€ 128.01
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RS Pro
Phase
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3
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-
SPDT
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Overvoltage Protection, Undervoltage Protection
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DIN Rail
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17.5 x 90 x 66.5mm
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-20 → +60°C
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-20°C
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Screw
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90mm
+60°C
66.5mm
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RS PRO Phase Monitoring Relay, 3 Phase, SPDT, Phase Loss, Voltage Assemmetry, DIN Rail
RS PRO Phase Monitoring Relay, 3 Phase, SPDT, Phase Loss, Voltage Assemmetry, DIN Rail
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RS Stock No.: 223-7795Brand: RS PRO

€ 146.84

€ 146.84 Each (Exc. Vat)

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Available in multiples of 1
1€ 146.84
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RS Pro
Phase
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-
3
-
-
SPDT
Phase Loss, Voltage Assemmetry
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DIN Rail
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17.5 x 90 x 66.5mm
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-20 → +60°C
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-20°C
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Screw
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90mm
+60°C
66.5mm
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