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Monitoring Relays

Monitoring relays, often called control relays or protection relays, are essential electrical devices designed to safeguard multiple electrical systems in commercial, residential, and industrial settings. These relays integrate alarms or communication capabilities to indicate the various electrical parameters, including current, voltage, insulation resistance, temperature, frequencies, and phase sequences. The fundamental purpose of a monitoring relay is to detect various electrical anomalies, prevent injuries, and ensure robust safety, reliability, and longevity of equipment. Our range of monitoring relays includes various devices from leading brands, including Eaton, Omron, ABB, Schneider Electric, Siemens, and more. 

Why Buy Monitoring Relays?

By investing in monitoring relays, businesses can prevent costly downtime, reduce maintenance expenses, and enhance the operational efficiency of their electrical systems. These compact devices ensure compliance with industry and safety standards and avoid equipment damage and safety hazards. 

Check Our Range of Monitoring Relays:

Monitoring relays come in various types based on their capabilities to measure different parameters. Our range includes: 

  • Current Monitoring Relays – Current monitoring relays are designed to track the current levels in electrical circuits and detect abnormalities like overcurrent, undercurrent, or phase imbalances. With features like adjustable trip settings and real-time feedback, a current monitoring relay provides a dependable solution for maintaining operational efficiency.
  • Voltage Monitoring Relays – These relays ensure the stability of electrical systems by monitoring voltage levels and detecting under-voltage, over-voltage, or voltage asymmetry conditions. They are crucial for protecting sensitive equipment like transformers, generators, and uninterruptible power supplies (UPS). Designed to work seamlessly in diverse environments, a voltage monitoring relay provides automatic corrective actions to avoid damage caused by voltage fluctuations.
  • Insulation Monitoring Relays – An insulation monitoring relay continuously measures the insulation resistance of ungrounded systems. It prevents electrical hazards such as insulation failures or short circuits and provides early warning of potential insulation faults before they become critical.
  • Phase Sequence Monitoring Relays – These relays are critical for three-phase electrical systems. They ensure the correct phase sequence to prevent equipment damage. Phase sequence relays detect phase failure, phase reversal, or phase asymmetry, safeguarding motors, compressors, and other rotating equipment from malfunction or breakdown. 

Typical Uses of Monitoring Relays:

Monitoring relays are widely used in various applications and systems, including:

  • Power Distribution Systems 
  • HVAC Systems
  • Building Automation Systems
  • Lighting Systems
  • Motor Control Systems
  • Hospitals
  • Renewable Energy Systems
  • Data Centers.

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LVM20A240, Lovato
6 In Stock
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£ 66.87
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V4PF480Y/277VSYTK02, Tele
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£ 101.28
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£ 98.25
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£ 95.20
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184790 EMR6-I1-A-1, Eaton
1 In Stock
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£ 213.18
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184779 EMR6-W500-D-1, Eaton
6 In Stock
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£ 200.35
Schneider Electric
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LV481004, Schneider Electric
1 In Stock
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£ 802.64
Siemens
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5TT3171, Siemens
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£ 242.38
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E1UM230V01, Tele
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£ 155.61
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£ 150.94
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£ 146.27
Schneider Electric
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RM22TU23, Schneider Electric
2 In Stock
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£ 99.29
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£ 79.43
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£ 74.47
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3RN2013-1GW30, Siemens
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£ 169.96
Schneider Electric
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RM22TA33, Schneider Electric
7 In Stock
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£ 99.72
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MK9055N.12 1-120.000IPM UH=AC230V+DC24V, Dold
1 In Stock
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£ 210.72
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RN5883.12/61 AC/DC24-80V 10-3000mA 0-10s, Dold
1 In Stock
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£ 484.09
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LH5946.48/61 0,2-4V UH=AC230V 0,2-6s, Dold
1 In Stock
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£ 607.10
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LR44/2 100-230V AC/DC, Broyce Control
2 In Stock
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£ 49.10
Carlo Gavazzi
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DUB02CT23, Carlo Gavazzi
9 In Stock
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£ 108.04
Carlo Gavazzi
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DUB03CW24, Carlo Gavazzi
1 In Stock
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£ 134.74
Siemens
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5TT3400, Siemens
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£ 143.56
RS PRO
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225-7387, RS PRO
39 In Stock
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£ 95.49
RS PRO
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122-215, RS PRO
31 In Stock
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£ 18.01
RS PRO
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122-217, RS PRO
65 In Stock
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£ 8.60
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3RF2990-0GA13, Siemens
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£ 132.79
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3RN2011-2BA30, Siemens
6 In Stock
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£ 85.29
Schneider Electric
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R9PCR, Schneider Electric
1 In Stock
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£ 49.64
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3RN2013-2GW30, Siemens
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£ 169.96
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3RN2010-2BA30, Siemens
1 In Stock
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£ 69.72
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New Items
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3RS11401GW60, Siemens

3RS11401GW60, Siemens

Temperature Monitoring Relays, 3RS10/11/1000/1010 Extremely simple operation Settable hysteresis Fast troubleshooting by detecting wire breakage Relay configuration: SPNC; SPNO
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1SVR730841R1300, ABB

1SVR730841R1300, ABB

CM-SRS Current Monitoring, Single Phase AC/DC Depending on the configuration, the current monitoring relays CM-SRS.1 and CM-SRS.2 can be used for over- or undercurrent monitoring in single-phase AC and/or DC systems. The current to be monitored (measured value) is applied to terminals B1/B2/B3-C. The devices work according the open-circuit principle. If the measured value exceeds resp. drops below the adjusted threshold value, the output relay(s) energize(s): on the CM-SRS.1 immediately, on the CM-SRS.2 after the set tripping delay TV. Monitoring of DC- and AC-currents: CM-SRS.x1: 3mA - 1A and CM-SRS.x2: 0.3-15A RMS measuring principle One device includes 3 measuring ranges Over- or undercurrent monitoring configurable Hysteresis adjustable from 3-30% Tripping delay TV adjustable 0.1-30s CM-SRS.1: 1 c/o contact CM-SRS.2: 2 c/o contacts 22.5mm width 3 LED's for status indication
New items
RM17UAS15, Schneider Electric

RM17UAS15, Schneider Electric

RM17 U Series Voltage Control Relay Schneider Electric RM17 U single-phase and direct current voltage control relays that monitor over-voltage and under-voltage, with or without memory, or that operate in window mode. The overvoltage and undervoltage threshold values are adjusted via two graduated potentiometers that directly read the Un being monitored. Checks its own power supply Clear hinged front cover LED display of output status DIN Rail mounting Approvals UL, CSA, GL, C-Tick, GOST Standards NF EN 60255-6 and IEC 60255-6 Approvals UL, CSA, GL, C-Tick, GOST Standards NF EN 60255-6 and IEC 60255-6 Schneider Electric Voltage, Current, Phase & Motor Protection
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RM17UAS16, Schneider Electric

RM17UAS16, Schneider Electric

RM17 U Series Voltage Control Relay Schneider Electric RM17 U single-phase and direct current voltage control relays that monitor over-voltage and under-voltage, with or without memory, or that operate in window mode. The overvoltage and undervoltage threshold values are adjusted via two graduated potentiometers that directly read the Un being monitored. Checks its own power supply Clear hinged front cover LED display of output status DIN Rail mounting Approvals UL, CSA, GL, C-Tick, GOST Standards NF EN 60255-6 and IEC 60255-6 Approvals UL, CSA, GL, C-Tick, GOST Standards NF EN 60255-6 and IEC 60255-6 Schneider Electric Voltage, Current, Phase & Motor Protection
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RM22TU21, Schneider Electric

RM22TU21, Schneider Electric

RM22-TR Three Phase Voltage Control Relay Schneider Electric Zelio RM22T series multifunction three phase voltage control relays. The RM22T series monitor phase sequence and phase loss. Sealable front cover to help protect settings Diagnostic button for load circuit testing Relay output status LED Fault detection indication LED Dial pointer LED indicator for relay power ON status Relay output On-delay or Off-delay 35 mm DIN Rail mount Schneider Electric Voltage, Current, Phase & Motor Protection
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3UG46211AW30, Siemens

3UG46211AW30, Siemens

Single Phase Current Real effective value measurement Applicable for frequencies with 40-500Hz AC and DC All devices can be digitally set and have an LCD display, a fault memory can be switched on Simultaneous monitoring of overcurrent and undercurrent over the complete measuring range Supply voltage 24-240Vac/dc Starting by-pass time 0.1 -20 secs. Off delay 0.1 - 20 secs. Contacts 1 C/O Measuring Range Hysteresis MPN Stock no. 3mA ac/dc up to 500mA ac/dc 0.1mA -250mA 3UG46211AW30 518-7124 0.05A ac/dc up to 10A ac/dc 0.01A - 5A 3UG46221AW30 518-7168
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RM17UBE16, Schneider Electric

RM17UBE16, Schneider Electric

RM17 U Series Voltage Control Relay Schneider Electric RM17 U single-phase and direct current voltage control relays that monitor over-voltage and under-voltage, with or without memory, or that operate in window mode. The overvoltage and undervoltage threshold values are adjusted via two graduated potentiometers that directly read the Un being monitored. Checks its own power supply Clear hinged front cover LED display of output status DIN Rail mounting Approvals UL, CSA, GL, C-Tick, GOST Standards NF EN 60255-6 and IEC 60255-6 Approvals UL, CSA, GL, C-Tick, GOST Standards NF EN 60255-6 and IEC 60255-6 Schneider Electric Voltage, Current, Phase & Motor Protection
New items
1SVR740712R1400, ABB

1SVR740712R1400, ABB

CM-MSS Thermistor Motor Protection Relays Heavy duty starting Increased switching frequency High ambient temperature Insufficient cooling Break operation Unbalance The CM range of thermistor motor protection relays are used to control motors equipped with PTC temperature sensors. The PTC temperature sensors are incorporated in the motor windings to measure the motor heating. This enables direct control and evaluation of the following operating conditions: Main features include: Dynamic interrupted wire detection Wide control supply voltage rang 24-240 V AC/DC Short circuit monitoring of the sensor circuit Non-volatile fault storage Remote reset Screw connection technology or Easy Connect Technology available Single Sensor Input Version Wire Break Detection Technical Specification Manufacturer Part No. Supply Voltage Output Manual Reset Remote Reset Test Button Stock Number 1SVR430800R9100 24Vac/dc 1NO No No No 464-518 1SVR430801R1100 220-240Vac 1NO No No No 464-520 1SVR430810R9300 24Vac/dc 2CO Yes Yes No 464-570 1SVR430811R0300 110-130Vac 2CO Yes Yes No 464-574 1SVR430811R1300 220-240Vac 2CO Yes Yes No 464-568 1SVR430711R0300 110-130Vac 2CO Yes Yes Yes 464-564 1SVR430711R2300 380-440Vac 2CO Yes Yes Yes 464-558 1SVR430720R0400 24-240Vac/dc 1NO 1NC Yes Yes Yes 464-552 1SVR430720R0300 24-240Vac/dc 2CO Yes Yes Yes 464-546 Approvals Some products also have the ATEX approval for the use in hazardous areas.
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GKRC-20F, ENTES

GKRC-20F, ENTES

The ENTES Voltage monitoring relays are designed for 3-phase systems to protect against voltage fluctuations. They detect phase loss, incorrect phase sequence, and monitor under and over voltage conditions with adjustable voltage limits. These relays are used for protecting compressors, electric motors, and capacitors in compensation systems, as well as in air conditioning and industrial cooling systems, telecom base stations, and railway applications. 1 C/O Contact DIN II Enclosure Rail Mounting
New items
IK9178 3AC50/60Hz 400V, Dold

IK9178 3AC50/60Hz 400V, Dold

IK9179 three-phase monitor and IK9178 display Monitoring of three-phase systems for direction of rotation No auxiliary voltage LED display lights up when a clockwise rotation field is detected 17.5 mm overall width In accordance with IEC 255, VDE 0435 Section 303 Additional function on IK9179 three-phase monitor Output 1 changeover contact for control purposes Input Nominal voltage U N : 3 AC 400 V Voltage range: 0.8 → 1.1 U N Frequency range: 45 → 65 Hz Output (IK9179 only) Contact assignment: 1 changeover Thermal current I th 4 A General data Rated operating current type: Continuous operation Temperature range: -20 °C → +60 °C Wire connection solid/stranded with sleeve: 2 x 2.5 mm 2 / 2 x 1.5 mm 2 Device dimensions (W x H x D): 17.5 x 90 x 59 mm Phase Sequence/Failure Relays Monitoring of 3 phase supplies Orange housing manufactured to DIN 43 880 DIN rail mount
New items
MK9052.11 AC50/60Hz 230V, Dold

MK9052.11 AC50/60Hz 230V, Dold

MK9052 - Thermistor motor protection relay 1 input for thermistors or bi-metallic contacts Wire breakage detection in the sensor circuit LED for switching status Rest current principle 1 changeover 22.5 mm overall width The MK9052 motor protection relay is used to prevent thermal overloads in motors (for example as caused by high switching frequencies, heavy start-up loads, single phase operation, interrupted cooling, high ambient temperature). Special thermistors (PTC resistors) developed specifically for motor protection are used as temperature sensors. Up to 6 sensors can be switched in sequence; when a fixed resistance level is reached, they cause the output relay of the MK9052 to de-energise. Input Response value/fallback value: ≥3 kΩ / ≤1.8 kΩ Measuring circuit load/voltage Approx. 1 mW / 1.2 V (R=1.5 kΩ) Auxiliary voltage U H 230 Vac, 50 / 60 Hz or 24 Vdc Voltage range U H 0.9 → 1.1 U H Output Contact assignment 1 changeover Response/fallback delay Thermal current 5 A Switching capacity 3 A (as per AC 11, AC 230 V) Voltage range U H 0.9 → 1.1 U H
New items
K8AK-VW3 100-240VAC, Omron

K8AK-VW3 100-240VAC, Omron

Omron K8AK-VS/VW Monitoring Relays Manual resetting and automatically resetting supported by one relay Pre-alarm monitoring mode Compact housings Resistant to high-frequency noise Compliance with global power and safety standards The Omron K8AK series monitoring relays are expertly designed for accurate and reliable monitoring of industrial facilities and equipment. The K8AK-VW/VS relays are ideal for monitoring overvoltages and undervoltages, which the K8AK-VW can do simultaneously. K8AK-VS/VW K8AK-TH K8AK-VS/VW
FAQs
We offer free shipping for orders over £200 if delivery is in the UK. All other orders in the UK, shipping from £7.99 depending on the weight and measurement. Mainland Europe shipping charges start from £25. For all other countries shipping charges start from £50 for products like Monitoring Relays and all others.
You can email us directly at sales@enrgtech.co.uk or via our website for any queries regarding Monitoring Relays or any other product.
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UK orders normally take between 2/3 working days. International orders normally take between 3/5 working days for all products including Monitoring Relays.
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