Overload Relays

About Industrial Overload Relays

Overload relays are used with motor starters and contactors to protect motors against sustained overload conditions and, depending on the relay design, phase failure or phase imbalance. They are commonly found in MCC panels, pump panels, compressors, conveyors, HVAC systems, process machinery and other installations where electric motors operate for long periods.

ARP IMPEX supplies overload relays for new motor control panels, plant maintenance, OEM equipment and replacement requirements. We handle enquiries against complete manufacturer part numbers as well as requirements where the buyer knows the motor current, contactor model or existing relay setting range.

For buyers looking for an overload relay supplier in India, thermal overload relay exporter, electronic overload relay supplier or a replacement for an existing ABB, Siemens, Schneider Electric or Legrand overload relay, the complete ordering code is the best starting point for quotation.

Thermal & Electronic Overload Relays

Overload relays are commonly available in thermal and electronic versions.

Thermal overload relays use a thermal operating principle and are widely used with contactors for standard motor starter applications. They are selected according to the motor full-load current, required adjustment range and compatible contactor size.

Electronic overload relays use electronic current measurement and can offer wider current setting ranges and additional motor protection functions, depending on the series. They are commonly considered where more accurate motor protection, selectable trip characteristics or a broader adjustment range is required.

An overload relay should not be treated as a substitute for short-circuit protection. The complete motor starter arrangement must be selected with the appropriate contactor and upstream protective device for the application.

Overload Relay Applications

Industrial overload relays are used wherever motors need protection against prolonged overcurrent and abnormal operating conditions.

Typical applications include:

• Motor control centres and MCC panels
• Direct-on-line motor starters
• Star-delta starters
• Pump control panels
• Compressors and blowers
• Fans and HVAC systems
• Conveyor systems
• Crushers and material handling equipment
• Machine tools
• Packaging and production machinery
• Water and wastewater plants
• Process plants
• Oil & gas installations
• Mining and cement plants
• OEM machinery and industrial equipment

For maintenance teams, an overload relay is often purchased as a replacement for an existing motor starter component, so matching the current range and contactor combination is particularly important.

How to Select an Overload Relay

Sending only the motor power in kW is not always enough to identify the correct overload relay. For a faster and more accurate quotation, buyers should provide as much of the existing equipment information as possible.

Useful details include:

• Manufacturer and complete model or ordering code
• Motor rated current / full-load current
• Overload relay adjustable current range
• Thermal or electronic type
• Trip class, where applicable
• Existing contactor model
• Manual or automatic reset requirement
• Mounting arrangement
• Quantity required
• Supply system details where relevant
• Delivery country

For a replacement overload relay, also send a clear photograph of the existing relay nameplate and contactor. This is especially useful when the original relay has been installed for several years or only part of the ordering code is visible.

Overload Relay Brands We Supply

ABB Overload Relays

ABB offers both thermal and electronic overload relays for motor protection. Its current product range includes thermal families such as T/TA/TF and electronic ranges including E/EF models. ABB overload relays are commonly combined with contactors for motor starter applications, with different adjustable current ranges available according to the selected model. ABB states that its thermal overload relays provide motor protection against overload and phase failure, while its EF electronic range extends into higher-current motor applications.

ARP IMPEX handles enquiries for ABB thermal overload relays, ABB electronic overload relays, existing ABB motor starter replacements and specific EF-series requirements. Buyers can send the complete ABB ordering code, motor current, contactor model, quantity and destination for quotation.

Siemens Overload Relays

Siemens supplies SIRIUS overload relays for industrial motor protection, including 3RU2 thermal overload relays and 3RB electronic overload relays. Siemens lists these ranges specifically under its industrial motor protection equipment, with models available for contactor mounting as well as application-dependent configurations.

We handle requirements for Siemens 3RU2 overload relays, Siemens 3RB electronic overload relays and replacement requirements used with SIRIUS contactors and motor starters. For an existing Siemens installation, send the complete 3RU or 3RB ordering code wherever possible.

Schneider Electric Overload Relays

Schneider Electric offers TeSys overload relay ranges for motor protection. The range includes TeSys Deca LRD thermal overload relays as well as electronic overload relay families such as LR9, with different current ranges and contactor combinations depending on the product series. Schneider states that its TeSys LRD relays are intended to protect AC circuits and motors against overload conditions.

ARP IMPEX handles enquiries for Schneider Electric TeSys overload relays, LRD series requirements, electronic overload relays and replacement models. Buyers should send the complete Schneider Electric reference number and current range because visually similar TeSys relays may have different electrical ratings.

Legrand Overload Relays

Legrand manufactures RTX³ thermal overload relays for industrial and commercial motor-control applications. RTX³ models are available in different current ranges and are designed for association with Legrand CTX³ contactors, with selected models also allowing separate mounting arrangements.

For Legrand RTX³ overload relay enquiries, send the complete reference number, adjustable current range, CTX³ contactor details where available, required quantity and delivery destination.

Replacement Overload Relays for Existing Motor Starters

Overload relay replacement needs a little more care than matching the physical size.

An existing motor starter may use a particular contactor and overload relay combination, so the replacement should be checked against the motor current, relay setting range, mounting arrangement and compatible contactor. This becomes especially important when replacing older motor control equipment during plant maintenance or shutdown work.

For an old or difficult-to-identify overload relay, send us:

brand + complete model number + motor current + contactor model + nameplate photograph + quantity + destination country.

If the exact model is no longer current, the available information can be used to check the requirement against the manufacturer’s present range.

Overload Relay Supplier & Exporter from India

ARP IMPEX supplies thermal and electronic overload relays from India for industrial buyers, electrical traders, panel builders, OEMs, maintenance contractors and project requirements.

In the Middle East, we handle overload relay enquiries for Bahrain, Egypt, Israel, Jordan, Kuwait, Lebanon, Oman, Qatar, Saudi Arabia and the United Arab Emirates. Requirements from the UAE, Saudi Arabia, Qatar, Oman and Kuwait commonly involve motor starter maintenance, industrial panels and replacement of existing ABB, Siemens or Schneider Electric components.

Across Africa, export enquiries can be handled for Morocco, Tunisia, Ghana, Nigeria, Senegal, Kenya, Mauritius, Rwanda, Tanzania, Uganda, Zambia, Botswana, Eswatini, Lesotho, Namibia and South Africa. Buyers looking for an overload relay supplier for Kenya, thermal overload relay exporter to Nigeria, or motor protection relay supply for Ghana, Tanzania, Zambia and other African markets can send the exact model details for quotation.

For Europe, we handle enquiries from Germany, the United Kingdom, France, Italy, the Netherlands, Spain, Belgium, Poland, the Czech Republic, Sweden, Denmark, Finland, Portugal, Hungary, Slovakia, Slovenia, Romania and Austria. Model-specific and replacement overload relay requirements can be checked for industrial maintenance, OEM and project applications.

Our Asian markets include Japan, South Korea, Singapore, Malaysia, Vietnam, Indonesia, Thailand, the Philippines, Bangladesh, Sri Lanka and Nepal. Requirements may range from single replacement units to larger quantities for machinery, motor control panels and industrial projects.

We also handle international enquiries from the United States, Canada, Mexico, Brazil, Chile, Colombia, Peru, Panama, Australia and New Zealand. For export quotations, always include the destination country along with the complete overload relay part number and quantity.

Request a Quote for Overload Relays

Already have a model number?

Send us the brand, complete model or ordering code, adjustable current range, quantity and delivery destination for quotation.

For replacement requirements, also share the motor current, existing contactor model and clear nameplate photographs of the overload relay and contactor.

REQUEST AN OVERLOAD RELAY QUOTE

Overload Relay FAQs

Which overload relay brands do you supply?

ARP IMPEX handles overload relay requirements from ABB, Siemens, Schneider Electric and Legrand, including thermal and electronic ranges depending on the manufacturer and model.

What details are needed to quote an overload relay?

The complete model or ordering code is preferred. Also provide the current setting range, quantity and destination country. For replacements, the motor current and existing contactor model are useful.

What is the difference between a thermal and electronic overload relay?

Thermal overload relays use a thermal operating principle and are widely used for conventional motor starters. Electronic overload relays use electronic current sensing and may provide wider setting ranges, selectable trip characteristics or additional protection functions depending on the model.

Can you supply an overload relay for an existing contactor?

Yes. Send the contactor model together with the existing overload relay part number and current range. This helps check the correct combination rather than selecting the relay by current rating alone.

Can you help replace an old overload relay?

Yes. Share the complete existing model number, nameplate photograph, motor current and contactor details. The requirement can then be checked against available models or the manufacturer’s current range.

Do you export overload relays outside India?

Yes. ARP IMPEX handles export enquiries for overload relays across the Middle East, Africa, Europe, Asia, the Americas, Australia and New Zealand.