Overload relays are crucial safety devices that protect electric motors from damage caused by overcurrent conditions. Selecting the appropriate overload relay ensures motor longevity, prevents costly downtime, and maintains operational safety in industrial settings. Understanding the key features and specifications will help you make an informed purchase.
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Discover now our comparison of the best Overload Relays. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best Overload Relays are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the Overload Relays in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.
SaleNo. 1
Schneider Electric DPER32 Easy TeSys Thermal Overload Relay with Manual/Automatic Reset, Screw Clamp Terminals...
- This thermal overload relay can be used in a network frequency of 0-4000hz, the rated insulation is 600V cUL / 690V IEC, and tripping class 10, for protection of 3-phase motors for HVAC, elevators, pumps or compressors, and agriculture
- It features a compact and modular design, making it an ideal solution for space-constrained applications and can be quickly and easily configured to meet the needs of your specific application
- A reliable and cost-effective solution for protecting your motor against overloads, phase failures, and phase unbalances; durable, compact design to protect from dust and other environmental elements
- The thermal overload relay has phase-break protection, manual and automatic reset, temperature compensation, trip indication, test button, stop button
- Compatible with these Schneider Electric contactors DPE38G7, DP38BL, DPE38U7, DPE38B7 and Schneider Electric’s Easy TeSys GP2E manual motor starter series; use with LAD7B106 Schneider Electric mounting adaptor
−9%
$39.99
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No. 2
Schneider Electric DPER07 Easy TeSys Thermal Overload Relay with Manual/Automatic Reset, Screw Clamp Terminals...
- This thermal overload relay can be used in a network frequency of 0-4000hz, the rated insulation is 600V cUL / 690V IEC, and tripping class 10, for protection of 3-phase motors for HVAC, elevators, pumps or compressors, and agriculture
- It features a compact and modular design, making it an ideal solution for space-constrained applications and can be quickly and easily configured to meet the needs of your specific application
- A reliable and cost-effective solution for protecting your motor against overloads, phase failures, and phase unbalances; durable, compact design to protect from dust and other environmental elements
- The thermal overload relay has phase-break protection, manual and automatic reset, temperature compensation, trip indication, test button, stop button
- Compatible with these Schneider Electric contactors DPE09G7, DPE09BL, DPE09U7, DPE09B7 and Schneider Electric’s Easy TeSys GP2E manual motor starter series; use with LAD7B106 Schneider Electric mounting adaptor
$33.94
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No. 3
ZGLEDUN Thermal Overload Relay Electric Heat Motor Protect Defender 23-32A
- RATED CURRENT：23-32A, SIZE: 3.1" x 3.8" x 2.4".
- RATED RANGE: This thermal relay can be used in the circuit of 50-60hz, the rated insulation voltage is 690V.
- SPECIFIC FUNCTION: The overload protection relay has phase break protection, manual and automatic reset, temperature compensation, trip indication, test button, stop button.
- GOOD PROTECTION: The relay is used for protecting the phase break when the electric motor is overload.
- PACKAGE LIST: 1 * Thermal Overload Relay.
No. 4
SCHNEIDER ELECTRIC - LRD10 - OVERLOAD RELAY
- Bi-Metallic Thermal Overload Relay
- Class 10
- IEC Contactor Type
- Setting Range is 4 to 6A
- Screw Clamp Terminals
No. 5
Walfront NR2-36 Electric Thermal Overload Relay, 23-32A Motor Protector, Heat Protection, Phase Break...
- : material ensures durability and long-lasting performance for this thermal overload relay, providing reliable protection for your electric motor.
- Wide usage: Versatile usage with the ability to operate in circuits of 50-60Hz and a rated insulation voltage of 690V, offering superior functionality and compatibility.
- Efficient protection: Innovative mechanism with temperature compensation feature enhances the performance of this thermal relay, ensuring precise and efficient protection against overload.
- Easy to use: Convenient design includes phase break protection, manual and automatic reset, trip indication, test button, and stop button, offering comprehensive safety features for ease of use.
- Practical: Enhanced protection with overload protection relay, thermal relay, and heat protect relay capabilities, ensuring optimal security and peace of mind for your electrical system.
No. 6
Antrader Thermal Overload Electric Overload Relay,23-32A Thermal Overload Relay
- Product Name: Thermal Overload Relay.
- Rated Insulation: 690V.
- Rated Current: 23-32A.
- Function: Providing reliable protection for your electric motor.
- Application: Used for protecting the phase break when the electric motor is overload.
No. 7
Schneider Electric DPER21 Easy TeSys Thermal Overload Relay with Manual/Automatic Reset, Screw Clamp Terminals...
- This thermal overload relay can be used in a network frequency of 0-4000hz, the rated insulation is 600V cUL / 690V IEC, and tripping class 10, for protection of 3-phase motors for HVAC, elevators, pumps or compressors, and agriculture
- It features a compact and modular design, making it an ideal solution for space-constrained applications and can be quickly and easily configured to meet the needs of your specific application
- A reliable and cost-effective solution for protecting your motor against overloads, phase failures, and phase unbalances; durable, compact design to protect from dust and other environmental elements
- The thermal overload relay has phase-break protection, manual and automatic reset, temperature compensation, trip indication, test button, stop button
- Compatible with these Schneider Electric contactors DPE25G7, DP25BL, DPE25U7, DPE25B7 and Schneider Electric’s Easy TeSys GP2E manual motor starter series; use with LAD7B106 Schneider Electric mounting adaptor
$32.28
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No. 8
Walfront Automatic Thermal Overload Relay 37-50A, 50-60Hz, 690V, 2NO 1NC Contacts
- Working Range: Suitable for using in power system with rated isolation voltage up to 690V, circuit of 50-60hz
- Longer Service: Can be used as overload of your long term or indirect long term service motor
- Function: Used for protecting the phase break when the electric motor is overload
- Temperature Compension: The relay has different mechanism and temperature compensation
- Multifunctions: With phase break protection, manual and automatic reset, temperature compensation, trip indication, test button and stop button
No. 10
Mudder QP2-4.7 PTC Starter Relay 1 Pin Refrigerator Starter Relay and 6750C-0005P Overload Protector...
- Package Content: you will get 1 piece of 4.7 Ohm 1 pin PTC start relay and 1 piece of 6750C-0005P refrigerator overload protector, totally 2 pieces for you, convenient to replace the old or broken part of your refrigerator; Please note the item is only...
- Compatible Models: the refrigerator overload protector can prevent the compressor in your refrigerator from overheating, nice to replace part numbers like AP4439459, 1357963, AH3529540, EA3529540, PS3529540, you can check the product description for list...
- PTC Starter Relay: the PTC start relay is the universal starter relay applied on mini fridges and coolers, saving your time and effort, this item is only compatible with QP2-4.7 one terminal relay, please do consider this before purchasing
- Easy to Install: refrigerator starter relay is made of plastic, the overload protector is made of plastic and brass, both materials are durable, reliable and rust resistant, also easy to install for direct replacement, which will work and restore cool air...
- Widely Applied: 4.7 Ohm 1 pin PTC start relay and 6750C-0005P refrigerator overload protector are compatible with most mini fridges, compact refrigerators, beverage and beer coolers, deep freezers, wine refrigerators, widely applied in your life; They are...
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Last update on 2026-04-16 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Overload Relays
Understanding Overload Relay Types
Overload relays are primarily categorized by their tripping mechanism. The most common types include:
- Thermal Overload Relays: These use bimetallic strips that bend when heated by excessive current, triggering a trip mechanism. They are popular due to their simplicity and cost-effectiveness.
- Electronic Overload Relays: These offer more advanced features like adjustable trip settings, phase loss detection, and communication capabilities. They provide greater precision and flexibility.
- Magnetic Overload Relays: These react to sudden short-circuit currents by using an electromagnet. They are typically used in conjunction with other relay types for enhanced protection.
Key Specifications to Consider
When choosing an overload relay, several specifications are vital:
- Current Rating: The relay must be rated to handle the motor's full load amperage (FLA). Ensure the adjustable range covers your motor's requirements.
- Trip Class: This indicates how quickly the relay will trip under varying overload conditions. Class 10 (trips within 10 seconds at 6 times FLA) is common, but Class 20 or 30 may be suitable for certain applications.
- Voltage Rating: The relay's voltage rating must be compatible with your system's voltage.
- Phase Loss Protection: Crucial for three-phase motors, this feature prevents damage if one phase of the power supply is lost.
- Reset Type: Relays can be manual (requiring a button push to reset) or automatic (resetting when conditions return to normal). Manual reset is often preferred for safety to ensure the cause of the overload is identified.
Application and Environment
Consider the operating environment and the specific application. Relays designed for harsh environments may have higher IP ratings for dust and water resistance. For applications with frequent starts or high inrush currents, a slower trip class or an electronic relay with adjustable settings might be more appropriate to prevent nuisance tripping.
Comparison Tips
When comparing different models, look beyond the basic specifications. Consider:
- Brand Reputation: Established manufacturers often offer reliable products and better support.
- Integration: If you're using a motor control center, ensure the relay is compatible with other components.
- Additional Features: Some relays offer remote reset, alarm contacts, or diagnostic capabilities. Evaluate if these add value to your specific setup.
Frequently Asked Questions
What is the difference between a thermal and electronic overload relay?
Thermal overload relays use bimetallic strips that heat up and bend to trip, offering simplicity. Electronic overload relays use solid-state components for more precise control, adjustable settings, and advanced features like phase loss detection.
What does 'Trip Class' mean for an overload relay?
Trip class defines the time it takes for the relay to trip under a specific overload condition, usually expressed as a multiple of the full load ampere (FLA). For example, a Class 10 relay will trip within 10 seconds at 6 times the FLA.
Why is phase loss protection important?
Phase loss protection is vital for three-phase motors. If one phase of the power supply is lost, the motor can overheat and sustain damage. This feature detects the loss and trips the relay to protect the motor.
Should I choose a manual or automatic reset overload relay?
Manual reset relays require a user to physically reset them after a trip, ensuring the cause of the overload is investigated. Automatic reset relays revert to normal operation when the overload condition is cleared, which can be convenient but may mask underlying issues.
How do I determine the correct current rating for my motor?
You should select an overload relay with a current rating that matches or slightly exceeds the motor's full load amperage (FLA), which is typically found on the motor's nameplate. The relay's adjustable range should encompass this FLA.
Can an overload relay protect against short circuits?
Overload relays are primarily designed to protect against sustained overcurrents that cause gradual overheating. They typically do not provide protection against instantaneous short circuits; separate short-circuit protection devices like fuses or circuit breakers are needed for that.
