Thermal and Electronic Overload Relays
Protect your motors from overcurrent and overheating with ABB overload relays. Available in thermal and electronic options, our relays provide reliable motor protection for a variety of applications, including pumps, conveyors, and HVAC systems. Ensure your operations run smoothly and safely with the right motor protection solution from Wistex.
Need assistance selecting the right overload relay? Contact our team.
Overload Relays We Offer
Wistex offers a full range of overload relays designed to protect motors from overheating, phase loss, and excessive current. Whether you need thermal or electronic protection, we provide reliable solutions for industrial applications across manufacturing, pumping, and HVAC systems.
Thermal Overload Relays
Thermal overload relays use a bimetallic strip that reacts to heat generated by excess current. As the strip bends under heat, it trips the relay to disconnect the motor, preventing damage. Thermal relays are highly effective for basic motor protection and are ideal for rugged environments where simplicity and reliability are key.
Electronic Overload Relays
Electronic overload relays use digital sensors to detect current surges with greater precision and speed. They offer adjustable settings, diagnostics, and advanced features like phase failure detection. Electronic relays are well-suited for applications requiring flexible, programmable motor protection and integration with control systems.
Applications for Overload Relays
Our overload relays are ideal for:
- Motor protection for water pumps and industrial fans
- Conveyor belt systems in manufacturing
- HVAC system compressors and blower motors
Complete your motor control system with contactors and soft starters.
Why Choose Wistex for Overload Relays & Motor Protection
Protect your investments with overload relays from Wistex. Our selection of thermal and electronic overload relays from ABB provides vital protection against overcurrent, phase failure, and overheating — essential for industries like manufacturing, pumping, and HVAC.
Why choose Wistex for overload relays?
- Specialized expertise in motor protection and system design
- In-stock options for fast shipping when downtime isn’t an option
- Top brands like ABB for unmatched reliability
- Support beyond the sale — helping you with setup, replacement, and scaling needs
Keep your motors safe and your business moving forward with overload relays from Wistex.
FAQs about Overload Relays
Understand how overload relays protect your motors and improve operational reliability.
Overload relays detect excessive current flowing through a motor circuit. If the current exceeds a preset level for too long (indicating a jam, blockage, or overload), the relay trips to disconnect the motor, preventing overheating and mechanical damage.
Thermal overload relays use a mechanical bimetallic strip that bends when heated by excess current. Electronic overload relays use sensors and processors for faster, more precise detection of overload conditions, often with more flexible setting options.
Replace an overload relay if it trips frequently without valid cause, shows inconsistent operation, suffers visible damage, or if the protected motor has been upgraded to a higher horsepower. Routine inspection during maintenance can help catch early signs of failure.