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Overload Relay

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Overload Relay

Overload relays are essential protective devices used in motor control systems to prevent electric motors from operating under excessive current conditions. They safeguard motors from damage caused by prolonged overloads and are typically installed in combination with contactors.

These relays monitor motor current continuously and disconnect the motor circuit when the current exceeds preset limits for a certain period. Available in thermal, electronic, or bimetallic types, overload relays provide accurate, resettable protection and are crucial for extending motor lifespan and ensuring system safety.

Benefits With Our Overload Relays

Reliable and responsive protection against prolonged overcurrent conditions.

  • Adjustable trip settings to match motor full load current
  • Manual or automatic reset options for flexibility
  • Compatible with a wide range of contactors and starters

Our overload relays comply with IEC 60947-4-1 standards and are available in a variety of current ranges to suit both small and large motors. They support single-phase and three-phase motors, and are equipped with test buttons, trip indicators, and stop/reset functions for easy maintenance and fault diagnosis.

Most Common Questions

Why use an overload relay in motor protection? Overload relays provide time-delayed protection against overcurrent conditions, preventing overheating and potential motor failure. They are a key component in maintaining motor health and operational safety in any electrical system.

Overload relays are primarily used in motor protection circuits to safeguard electric motors from excessive current conditions. They are commonly integrated into motor starters in industries such as manufacturing, HVAC, and water treatment.
Overload relays monitor the motor current and trip the circuit if the current exceeds a preset value for too long. This prevents overheating and damage to the motor windings, ensuring safe and efficient operation.
Overload relays are available in thermal (bimetallic), electronic, and digital variants. Thermal types use heat to trigger tripping, while electronic relays provide more precise protection and advanced features like phase-loss and phase-imbalance detection.
Regular maintenance includes verifying the current settings, testing trip functionality, inspecting for dust or debris buildup, and checking connections. In harsh environments, more frequent checks ensure continued reliability and motor protection.