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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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Siemens
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5TT3171, Siemens
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£ 255.88
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1SVR730700R2100 CM-MSS.13S, ABB
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£ 64.85
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£ 61.61
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£ 58.37
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84871122, Crouzet
18 In Stock
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£ 111.41
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£ 105.84
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£ 100.24
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84873222, Crouzet
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£ 155.44
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£ 147.66
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£ 139.91
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84872501, Crouzet
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£ 195.38
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£ 185.62
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£ 175.84
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MK9040N.12/001 3AC50/60Hz 400V, Dold
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£ 144.23
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5SV8000-6KK, Siemens
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£ 308.83
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84873220, Crouzet
5 In Stock
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£ 169.95
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£ 161.46
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£ 152.95
Allen Bradley
700S-EF620EJC, Allen Bradley
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£ 92.46
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3RF2990-0GA13, Siemens
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£ 140.04
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5TT6113, Siemens
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£ 352.60
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70.92.8.230.0002, Finder
19 In Stock
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£ 79.20
Carlo Gavazzi
DPA01CM69, Carlo Gavazzi
7 In Stock
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£ 109.37
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£ 104.92
Carlo Gavazzi
DWA01CM485A, Carlo Gavazzi
2 In Stock
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£ 118.85
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£ 114.01
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IL5881.12/100 DC12-280V 5-200kOHM, Dold
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£ 216.76
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MK9056N.12 AC50/60Hz 380-500V, Dold
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£ 124.10
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265574 Z-TN230/SS, Eaton
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£ 85.73
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£ 82.25
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1SVR750489R8300 CM-MPN.72S, ABB
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£ 262.37
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70.92.0.024.0002, Finder
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£ 81.59
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1SVR730700R0100 CM-MSS.12S, ABB
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£ 64.85
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£ 61.61
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£ 58.37
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3RR2241-2FA30, Siemens
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£ 176.99
Schneider Electric
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IMD-IM400-1700C, Schneider Electric
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£ 1587.84
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5TT3404, Siemens
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£ 369.13
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DIB01CD485A, Carlo Gavazzi
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£ 126.19
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£ 121.07
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BH9097.38/001 3AC400V AC40A, Dold
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£ 424.05
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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
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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
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IK9179.11 3AC50/60Hz 400V, Dold

IK9179.11 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
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IK9169.11 3AC380-415/220-240V, Dold

IK9169.11 3AC380-415/220-240V, Dold

IK9169 phase monitor, IK9168 phase monitor display Detection of phase failure in three-phase systems Single-phase connection also an option Rest current principle Adjustable phase sequence LED display for each phase 17.5 mm overall width Additional function on IK9169 phase monitor Output 1 changeover contact for control purposes Meets IEC 255, VDE 0435 Part 303 Input Nominal voltage U N : 3 AC 230 / 400 V Voltage range: 0.8 → 1.1 U N Frequency range: 45 → 65 Hz Response value: IK9169: 0.7 U N ±10% IK9168: 0.5 U N ±10% Output (IK9169 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 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
1SVR550855R9400 CM-ENE MAX, ABB

1SVR550855R9400 CM-ENE MAX, ABB

The ABB CM-ENE MAX is the liquid level relay with overflow protection. The measuring range of the liquid level relay is the 0 to 100 kΩ. The rated control supply voltage of the relay is the 24 V dc. Filling monitoring Overflow protection Screw type terminals
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1SVR730750R0400, ABB

1SVR730750R0400, ABB

CM-EFS Voltage Window Monitoring Relay - Single Phase AC/DC The voltage window monitoring relay CM-EFS.2 can be used for the simultaneous monitoring of over- (>U) and undervoltages ( The voltage to be monitored (measured value) is applied to terminals B-C. Open- or closed-circuit principle as well as an adjustable ON A or OFF tripping delay are configurable. Monitoring of DC- and AC voltages from 3-600 V RMS measuring principle One device includes 4 measuring ranges: 3-30V; 6-60V; 30-300V; 60-600V Over- and undervoltage monitoring ON-or OFF-delay configurable Open- or closed circuit principle configurable Latching function configurable Thresholds for Umin and Umax adjustable Fixed hysteresis of 5% Tripping delay TV adjustable 0; 0.1-30s 1x2 c/o contacts (common signal) or 2x1 c/o contact (separate signals for Umin and Umax) 22.5mm width 3 LED's for status indication
New items
1SVR740720R1400, ABB

1SVR740720R1400, 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.
New items
184759 & EMR6-PH22, Eaton

184759 & EMR6-PH22, Eaton

Eaton Supply Monitoring Relay The Eaton supply monitoring relay is an ideal protection device for a wide range of switchgear applications. Monitoring a 3 phase power supply is important to protect the electrical devices connected to the supply. Power fluctuations can seriously damage the devices. This relay is capable of monitoring functions related to the power supply like asymmetry, phase failure, overvoltage, undervoltage, over-frequency and under-frequency, undercurrent and overcurrent. This relay is universally suitable for a large number of applications. It reduces inventory costs and saves time during the equipment selection process. Like any other Eaton relay, this monitoring relay guarantees minimum shutdown time, high efficiency and sustainable long life. Features and Benefits • Ambient temperature ranges between -25°C and 60°C • Burst and surge protection • Contact configuration: CO • High shock resistance • Immune to radiation • LED status indicators • Mechanical lifespan of 10M cycles • Quick response time • Weather protection Applications • Current monitoring equipment • Electric engineering • Factory automation • Light industrial environments • Low-voltage switch technology • Monitoring equipment • Monitoring machine temperatures • Process control engineering • Residential facilities Certifications • CCC approved • CE certified • CSA certified • EAC approved • IP20 rating protection for terminals • IP50 rating protection for enclosure • RCM certified • UL approved
New items
102-6135, RS Pro

102-6135, RS Pro

LX Series - Three Phase Relays L Series relay range of timers, control and three phase relays incorporate the latest technology and offer a wide range of user adjustable features. 17.5mm DIN rail housing Microprocessor based Measures phase to phase voltages 1 x SPDT relay output 8A Green LED indication for supply status Red LED indication for relay status Approvals UL Certification
New items
DIB01CD4810A, Carlo Gavazzi

DIB01CD4810A, Carlo Gavazzi

The Carlo Gavazzi DIB01 is a precise TRMS AC/DC over or under current monitoring relays. Direct measuring or through current transformer. Owing to the built-in latch function, the ON-position of the relay output can be maintained. Inhibit function can be used to avoid relay operation when not desired. The LED's indicate the state of the alarm and the output relay. Through the built-in shunt it is possible to monitor loads up to 10 A AC/DC. Selection of measuring range by DIP-switches Measuring ranges from 0.1 mA to 10 A AC/DC Adjustable current on relative scale Adjustable hysteresis on relative scale Adjustable delay function (0.1 to 30 s)
New items
DTA71CM24, Carlo Gavazzi

DTA71CM24, Carlo Gavazzi

The Carlo Gavazzi motor thermistor relay can monitor up to 6 motor temperatures through the motor internal temperature. It features 1 output, AUTO reset and no TEST switch. The bi-colour front LED, through colours and blinks, indicates Power ON, PTC failures, alarms and when it is ready for RESET. High operating safety Save time and costs Ensure continuous production process in your plant Low profile DIN rail mounting
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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Yes, we offer special discounts on orders above £200 for Monitoring Relays and all other products.
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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