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 1171 products
SR 806.12
SR 806.12 Each (ex VAT)
Check stock
1
RS Pro
Phase
3
SPDT
Phase Loss, Voltage Assemmetry
-
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
17.5 x 90 x 66.5mm
-
-
-
-
-
Screw
-20°C
90mm
-
-
-20 → +60°C
66.5mm
-
-
-
+60°C
-
SR 925.22
SR 925.22 Each (ex VAT)
Check stock
1
RS Pro
Voltage
3
DPDT
-
Overvoltage Protection, Undervoltage Protection
-
-
DIN Rail
-
-
-
-
-
2 → 999s
-
-
-
-
-
36 x 90 x 67mm
-
-
-
-
-
Screw
-10°C
36mm
-
-
-10 → +60°C
66.21mm
-
-
-
+60°C
-
SR 990.79
SR 990.79 Each (ex VAT)
Check stock
1
RS Pro
Voltage
3
DPDT
-
Overvoltage Protection, Undervoltage Protection
-
-
DIN Rail
-
-
-
-
-
2 → 999s
-
-
-
-
-
36 x 90 x 67mm
-
-
-
-
-
Screw
-10°C
36mm
-
-
-10 → +60°C
66.21mm
-
-
90mm
+60°C
-
SR 859.94
SR 859.94 Each (ex VAT)
Check stock
1
RS Pro
Phase, Voltage
3
SPDT
-
Overvoltage Protection, Undervoltage Protection
-
-
DIN Rail
-
-
-
-
Phase Loss, Phase Sequence, Phase Asymmetry
2 → 999s
-
-
-
-
-
36 x 90 x 67mm
-
65Hz
-
-
-
Screw
-10°C
36mm
-
-
-10 → +60°C
66.21mm
45Hz
-
-
+60°C
-
SR 820.56
SR 820.56 Each (ex VAT)
Check stock
1
RS Pro
Phase
3
SPDT
-
Overvoltage Protection, Undervoltage Protection
-
-
DIN Rail
-
-
-
-
-
-
-
-
-
-
-
17.5 x 90 x 66.5mm
-
-
-
-
-
Screw
-20°C
90mm
-
-
-20 → +60°C
66.5mm
-
-
-
+60°C
-
SR 833.81
SR 833.81 Each (ex VAT)
Check stock
1
RS Pro
Phase, Voltage
3
DPDT
243 → 540 V
Undervoltage
-
-
DIN Rail, Surface Mount
-
-
-
-
Phase Failure, Phase Sequence
0.2 → 10s
-
-
-
-
-
89 x 17.5 x 66.5mm
540V
-
-
243 V
-
Screw
-20°C
17.5mm
Microprocessor Based, Detects Incorrect Phase Sequence, Phase Loss And Neutral Loss, Adjustment For Under Voltage Trip Level, Adjustment For Time Delay
-
-20 → +60°C
89mm
-
-
66.5mm
+60°C
-
SR 422.72
SR 422.72 Each (ex VAT)
Check stock
1
RS Pro
Phase
3
-
-
-
-
-
DIN Rail, Surface Mount
-
-
-
-
Phase Failure, Phase Sequence
-
-
-
-
-
-
-
-
-
-
-
-
Screw
-20°C
17.5mm
3 LEDs for Phase presence status, Sequence Status,
-
-20 → +60°C
66.5mm
-
-
-
+60°C
-
SR 840.97
SR 840.97 Each (ex VAT)
Check stock
1
RS Pro
Phase, Voltage
3
DPDT
-
Overvoltage, Undervoltage
-
-
DIN Rail
-
-
-
-
Phase Failure, Phase Sequence
-
-
-
-
-
-
-
-
-
-
-
-
Screw
-
17.5mm
-
-
-
-
-
-
-
-
-
SR 756.58
SR 756.58 Each (ex VAT)
Check stock
1
P.O.A.
Check stock
1
P.O.A.
Check stock
1
P.O.A.
Check stock
1
P.O.A.
Check stock
1
P.O.A.
Check stock
1
P.O.A.
Check stock
1
P.O.A.
Check stock
1
P.O.A.
Check stock
1
P.O.A.
Check stock
1
SR 448.21
SR 448.21 Each (ex VAT)
Check stock
1
RS Pro
Voltage
1
SPDT
12 → 24V dc
Undervoltage
-
-
DIN Rail
-
-
-
-
-
0 → 30s
-
-
-
L
-
17.5 x 66.5 x 89mm
24V dc
-
-
12V dc
-
Screw
-20°C
17.5mm
-
-
+60°C
66.5mm
-
1
89mm
+60°C
-
SR 488.85
SR 488.85 Each (ex VAT)
Check stock
1
RS Pro
Phase, Voltage
3
SPDT
-
Undervoltage
-
-
DIN Rail
-
-
-
-
Phase Failure, Phase Sequence
0.2 → 10s
48 → 63Hz
-
-
L
-
17.5 x 66.5 x 89mm
-
-
-
-
-
Screw
-20°C
17.5mm
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
-
+60°C
66.5mm
-
1
89mm
+60°C
-
...