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...

Showing 1-20 of 1247 products

Filter

Sort

Filter

Sort

Relevance
Price (high-low)
Price (low-high)
RS PRO Current Monitoring Relay, Single Phase, 150 → 260V ac, DIN Rail
RS PRO Current Monitoring Relay, Single Phase, 150 → 260V ac, DIN Rail
Add to parts list
RS Stock No.: 132-174Brand: RS PRO

€ 23.28

€ 23.28 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 23.28
Add to basket
RS Pro
Current
-
-
-
Single
-
150 → 260V ac
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RS PRO Current Monitoring Relay, Three Phase, 1NO/1NC, DIN Rail Mount
RS PRO Current Monitoring Relay, Three Phase, 1NO/1NC, DIN Rail Mount
Add to parts list
RS Stock No.: 434-506Brand: RS PRO

€ 46.16

€ 46.16 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 46.16
Add to basket
RS Pro
Current
-
-
-
Three
1NO/1NC
-
-
-
-
-
DIN Rail Mount
-
40A
100A
-
-
-
0.1 → 20s
-
-
-
-
-20 to 55°C
-20°C
55°C
-
-
84.5mm
-
CE
44 x 84.5 x 75mm
-
-
-
-
-
40 → 100A
75mm
Error Delay Time Adjustable
44mm
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
Add to parts list
RS Stock No.: 132-171Brand: RS PRO

€ 21.38

€ 21.38 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 21.38
Add to basket
RS Pro
Liquid Level
-
-
-
Single
-
150 → 260V ac
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RS PRO Phase Monitoring Relay, Three Phase, 150 → 260V ac, DIN Rail
RS PRO Phase Monitoring Relay, Three Phase, 150 → 260V ac, DIN Rail
Add to parts list
RS Stock No.: 122-217Brand: RS PRO

€ 10.55

€ 10.55 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 10.55
Add to basket
RS Pro
Phase
-
-
-
Three
-
150 → 260V ac
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
Add to parts list
RS Stock No.: 122-216Brand: RS PRO

€ 14.48

€ 14.48 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 14.48
Add to basket
RS Pro
Phase
-
-
-
Three
-
380V ac
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
Add to parts list
RS Stock No.: 132-172Brand: RS PRO

€ 14.38

€ 14.38 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 14.38
Add to basket
RS Pro
Phase
-
-
-
Three
-
380V ac
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
RS PRO Phase Monitoring Relay, Three Phase, 380V ac, DIN Rail
Add to parts list
RS Stock No.: 132-173Brand: RS PRO

€ 18.01

€ 18.01 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 18.01
Add to basket
RS Pro
Phase
-
-
-
Three
-
380V ac
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
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
Add to parts list
RS Stock No.: 558-898Brand: RS PRO

€ 41.58

€ 41.58 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 41.58
Add to basket
RS Pro
Voltage
-
-
-
1
CO
150 → 300V ac
-
-
Overvoltage, Undervoltage
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Screw
CE, cULus, DEKRA, IEC, IQNet, ISO EN 9000
-
-
-
-
-
-
-
-
-
-
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
Add to parts list
RS Stock No.: 558-901Brand: RS PRO

€ 41.25

€ 41.25 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 41.25
Add to basket
RS Pro
Voltage
-
-
-
1
CO
150 → 300V ac
-
-
Overvoltage, Undervoltage
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Screw
CE, cULus, DEKRA, IEC, IQNet, ISO EN 9000
-
-
-
-
-
-
-
-
-
-
RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, DIN Rail
RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, DIN Rail
Add to parts list
RS Stock No.: 558-892Brand: RS PRO

€ 35.36

€ 35.36 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 35.36
Add to basket
RS Pro
Voltage
-
-
-
3
CO
-
-
-
Voltage Asymmetry
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Screw
CE, cULus, DEKRA, IEC, IQNet, ISO EN 9000
-
-
-
-
-
-
-
-
-
-
RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, DIN Rail
RS PRO Phase, Voltage Monitoring Relay, Three Phase, CO, DIN Rail
Add to parts list
RS Stock No.: 558-897Brand: RS PRO

€ 30.06

€ 30.06 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 30.06
Add to basket
RS Pro
Voltage
-
-
-
3
CO
-
-
-
Voltage Asymmetry
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Screw
CE, cULus, DEKRA, IEC, IQNet, ISO EN 9000
-
-
-
-
-
-
-
-
-
-
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
Add to parts list
RS Stock No.: 434-521Brand: RS PRO

€ 42.10

€ 42.10 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 42.10
Add to basket
RS Pro
Voltage
-
-
-
Single
1NO
120 → 300V ac
-
-
Overvoltage
-
DIN Rail Mount
-
-
-
-
-
-
0.1 → 600s
-
-
-
-
-20 to 55°C
-20°C
55°C
-
-
67.5mm
-
CE
52.9 x 67.5 x 90.3mm
300V
120V
-
-
-
-
90.3mm
Built-In Current Transformer, Built-In Contactor
52.9mm
RS PRO Voltage Monitoring Relay, Single Phase, 220V ac, DIN Rail
RS PRO Voltage Monitoring Relay, Single Phase, 220V ac, DIN Rail
Add to parts list
RS Stock No.: 122-210Brand: RS PRO

€ 16.52

€ 16.52 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 16.52
Add to basket
RS Pro
Voltage
-
-
-
Single
-
220V ac
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
RS PRO Voltage Monitoring Relay, Single Phase, 220V ac, DIN Rail
RS PRO Voltage Monitoring Relay, Single Phase, 220V ac, DIN Rail
Add to parts list
RS Stock No.: 122-215Brand: RS PRO

€ 22.08

€ 22.08 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 22.08
Add to basket
RS Pro
Voltage
-
-
-
Single
-
220V ac
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
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
Add to parts list
RS Stock No.: 434-520Brand: RS PRO

€ 33.49

€ 33.49 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 33.49
Add to basket
RS Pro
Voltage
-
-
-
Three
1NO/1NC
230 → 460V ac
-
-
Overvoltage
-
DIN Rail or Panel
-
-
-
-
-
Phase Loss
0.1 → 10s
-
-
-
-
-20 to 55°C
-20°C
55°C
-
-
84.5mm
-
CE
44 x 84.5 x 75mm
460V
230V
-
-
-
-
75mm
Phase Sequence Control, With PTC, Non-Neutral
44mm
RS PRO Voltage Monitoring Relay, Three Phase, 380V ac, DIN Rail
RS PRO Voltage Monitoring Relay, Three Phase, 380V ac, DIN Rail
Add to parts list
RS Stock No.: 122-212Brand: RS PRO

€ 19.42

€ 19.42 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 19.42
Add to basket
RS Pro
Voltage
-
-
-
Three
-
380V ac
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
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
Add to parts list
RS Stock No.: 102-6130Brand: RS PRO

€ 62.30

€ 62.30 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 62.30
Add to basket
RS Pro
Voltage
-
-
-
1
SPDT
12 → 24V dc
-
-
Undervoltage
-
DIN Rail
-
-
-
-
-
-
0 → 30s
-
-
-
L
+60°C
-20°C
+60°C
-
1
17.5mm
Screw
-
17.5 x 66.5 x 89mm
24V dc
12V dc
-
-
-
-
89mm
-
66.5mm
RS PRO Phase, Voltage Monitoring Relay, 3 Phase, SPDT, DIN Rail
RS PRO Phase, Voltage Monitoring Relay, 3 Phase, SPDT, DIN Rail
Add to parts list
RS Stock No.: 102-6136Brand: RS PRO

€ 67.97

€ 67.97 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 67.97
Add to basket
RS Pro
Phase, Voltage
-
-
-
3
SPDT
-
-
-
Undervoltage
-
DIN Rail
-
-
-
-
-
Phase Failure, Phase Sequence
0.2 → 10s
48 → 63Hz
-
-
L
+60°C
-20°C
+60°C
-
1
17.5mm
Screw
-
17.5 x 66.5 x 89mm
-
-
-
-
-
-
89mm
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
66.5mm
RS PRO Phase Monitoring Relay, 3 Phase, SPDT, DIN Rail
RS PRO Phase Monitoring Relay, 3 Phase, SPDT, DIN Rail
Add to parts list
RS Stock No.: 223-7792Brand: RS PRO

€ 98.09

€ 98.09 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 98.09
Add to basket
RS Pro
Phase
-
-
-
3
SPDT
-
-
-
Overvoltage Protection, Undervoltage Protection
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-20 → +60°C
-20°C
+60°C
-
-
90mm
Screw
-
17.5 x 90 x 66.5mm
-
-
-
-
-
-
-
-
66.5mm
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
Add to parts list
RS Stock No.: 223-7795Brand: RS PRO

€ 112.24

€ 112.24 Each (Exc. VAT)

Check stock

1

Available in multiples of 1
1€ 112.24
Add to basket
RS Pro
Phase
-
-
-
3
SPDT
Phase Loss, Voltage Assemmetry
-
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
-20 → +60°C
-20°C
+60°C
-
-
90mm
Screw
-
17.5 x 90 x 66.5mm
-
-
-
-
-
-
-
-
66.5mm

...