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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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ifm electronic
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DD0203, ifm electronic
10 In Stock
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1 +
£ 191.75
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TR4801-02-24VAC/DC, Tempatron
1 In Stock
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£ 108.41
5 +
£ 103.97
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TR4801-01-24VAC/DC, Tempatron
2 In Stock
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£ 108.41
5 +
£ 103.97
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5SV8000-6KK, Siemens
2 In Stock
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£ 245.94
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RN5883.12/61 AC/DC24-80V 10-3000mA 0-10s, Dold
1 In Stock
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£ 442.20
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LH5946.48/61 0,2-4V UH=AC230V 0,2-6s, Dold
1 In Stock
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£ 554.57
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LVM20A240, Lovato
7 In Stock
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£ 60.01
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MK9055N.12 1-120.000IPM UH=AC230V+DC24V, Dold
3 In Stock
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£ 192.48
Siemens
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5TT3400, Siemens
Pre Order
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£ 130.47
Allen Bradley
700S-EF620EJC, Allen Bradley
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£ 84.47
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3RF2990-0GA13, Siemens
999997 In Stock
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£ 151.87
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3RS25002AW30, Siemens
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£ 137.49
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3RS28002BA40, Siemens
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£ 262.14
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3RS29001AA30, Siemens
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£ 123.87
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3UG45831CW31, Siemens
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£ 556.75
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1SVR730722R1400 CM-MSS.21S, ABB
6 In Stock
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£ 93.29
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£ 88.63
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£ 83.96
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1SVR730712R1400 CM-MSS.31S, ABB
16 In Stock
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£ 114.20
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£ 108.49
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£ 102.77
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1SVR740712R2200 CM-MSS.33P, ABB
1 In Stock
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£ 70.42
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£ 67.55
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1SVR730740R0200 CM-TCS.12S, ABB
1 In Stock
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£ 198.39
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£ 188.47
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£ 178.55
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MK9040N.12/001 3AC50/60Hz 400V, Dold
1 In Stock
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£ 131.75
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MAC04D0100, GIC
86 In Stock
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£ 43.05
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£ 41.73
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£ 39.97
704284002032, Finder
4 In Stock
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£ 103.46
720182405002, Finder
1 In Stock
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£ 64.02
Siemens
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5TT3171, Siemens
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£ 220.28
Schneider Electric
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RM22TU23, Schneider Electric
2 In Stock
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£ 45.89
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New Items
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84871122, Crouzet

84871122, Crouzet

RELAY MONITOR CURRENT 2-20A ADJ
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84873220, Crouzet

84873220, Crouzet

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TPRVM001, Schneider Electric

TPRVM001, Schneider Electric

The Schneider Electric TeSys island voltage interface module which is used for monitoring of the mains voltage powering the island and reporting of the voltage to the bus coupler to enable power and energy monitoring. Overvoltage category III IP degree of protection IP20 Pollution degree 2 Protective treatment TC
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84872120, Crouzet

84872120, Crouzet

RELAY MONITOR VOLT 0.2-60V ADJ
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3UG45111AQ20, Siemens

3UG45111AQ20, Siemens

The Siemens Analog Monitoring Relay, monitors phase sequence 3x has 420 V to 690 V control supply voltage at 50 to 60 Hz rated value with 1 change-over contact and screw type terminals type of electrical connection, any mounting position also has IP20 protection class. Degree of pollution 3 Number of poles for main current circuit 3 AC type of voltage Height 83 mm Width 22.5 mm Depth 91 mm
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84872151, Crouzet

84872151, Crouzet

CONTROL VOLT CNTRL 20-80VAC/DC
New items
RM35UA13MW, Schneider Electric

RM35UA13MW, Schneider Electric

RM35 UA Series Multifunction Voltage Control Relay Schneider Electric RM35 UA multifunction current control relays monitor both AC and DC currents. Featuring automatic current recognition for overcurrent and undercurrent moniotoring. 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
3UG45131BR20, Siemens

3UG45131BR20, Siemens

Line Supply and Three Phase Voltage 3UG4 relays that monitor current, power factor and active current are ideal for monitoring the load of motors and functionality of electronic loads. These devices detect the effect of wear and faults early on. This means that appropriate actions can be taken before more significant damage occurs. Wide voltage range versions reduce inventory stock levels Variable settings for over-range, under-voltage or window monitoring Delay times and reset switch Actual value and fault types are permanently displayed Removable terminals 22.5mm wide 3UG4614 to 3UG4617 can be digitally set, with fault memory and LDC display 1-20V hysterisis Phase failure (except stock no 518-7275 ) Phase Sequence Phase Imbalance (%) Under Voltage (V) Over voltage (V) Delay Times MPN Stock no Yes n/a n/a n/a n/a 3UG45111BP20 518-7275 Yes 20 160-690 n/a 0.1-20 (off) 3UG45131BR20 518-7297 Selectable 0 or 5-20 160-690 n/a 0.1-20 (on/off) 3UG46141BR20 518-7051 Selectable Using Threshold Values 160-690 160-690 0.1-20 for V min and V max 3UG46151CR20 518-7174 Automatic Correction 0 or 5-20 160-690 160-690 0.1-20 (off) 3UG46171CR20 518-7180
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TPRPM038, Schneider Electric

TPRPM038, Schneider Electric

Schneider Electric TeSys Island Power Module - TPRPM038 Introducing the Schneider Electric power interface module, this module forms part of the TeSys Island range of products, it connects to an automation controller through a bus coupler and is only operational when this connection is made. The functions that are available with this power module are upstream voltage presence detection, electronic thermal overload protection, monitoring of currents and the control of third party power devices (when associated to TPRDG IO module). Features & Benefits • The TeSys Island module is compatible with TPRBC bus coupler, TPRDG digital IO module and TPRAN analog IO module • 3 poles (3P) • Features a rated operational voltage of <= 690 V AC 47...63 Hz • Overvoltage category - III • The power module can be reset remotely or automatically • Local signalling consists of 1 LED (green/red) DS (device status) & 1 LED (green/red) LS (load status) • One to three-phase Power Module Protection Type • Thermal overload protection • Motor overheats • Overcurrent • Undercurrent • Jam • Long start • Stall • Rapid cycle lockout • Phase loss • Rapid restart lockout • Phase reversal • Phase unbalance • Phase sequence • Ground current Power Module Monitoring Type • Time device ON • Number of faults • Number of device power cycles • Average current Iavg • Average voltage Vavg • Max current Imax • Max voltage Vmax Discovering TeSys Island A concept that is dedicated to control and monitor machines and processes, each TeSys Island product plays an important role to switch, protect and manage motors and electrical loads up to 80 Amps (AC3) within an electrical control panel. • A fantastic digital load management solution that enables your machines and processes to be smarter and reliable • TeSys Island provides ...
New items
84873025, Crouzet

84873025, Crouzet

RELAY MONITOR 3PHASE 208-480V
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84872141, Crouzet

84872141, Crouzet

RELAY CONTROL VOLT 20-80VAC/DC
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.
This depends on the Monitoring Relays individual product and information that can be found on our website.
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.
Yes. We keep updating our stock frequently and if a product like Monitoring Relays is not in stock then we will let you know.