Thermal Overload Relay

Technical Specifications (Generic)

  • Type: Thermal overload relay

  • Rated Operational Voltage: Typically 220–690V AC

  • Current Adjustment Range: Depends on model (e.g., 0.1A–32A / 28A–40A / 48A–65A etc.)

  • Trip Class: Class 10/20/30

  • Reset Mode: Auto/Manual

  • Mounting Type: Contactor-mount or standalone

  • Protection: Overload, phase loss

  • Operating Temperature: –5°C to +55°C (varies by model)

  • Standards: IEC/EN compliant


Applications

  • Industrial automation

  • Motor starters

  • Pumps and compressors

  • HVAC systems

  • Conveyor systems

  • Machine tools

  • Electrical panels

Description

A Thermal Overload Relay is a protective device used in motor control systems to safeguard electric motors from overheating and damage caused by overload conditions. It automatically disconnects the motor circuit when excessive current flows for too long, ensuring safe operation and extending motor life.


Key Features

  • Reliable Motor Protection: Detects overloads and prevents motor damage by tripping the circuit at unsafe current levels.

  • Bimetallic Technology: Uses precision-engineered bimetal strips for accurate thermal sensing and stable performance.

  • Adjustable Current Range: Allows fine-tuning based on the motor’s rated current.

  • Auto/Manual Reset Options: Choose between manual or automatic reset modes for convenient operation.

  • Trip Class Options: Available in Class 10, 20, and 30 depending on application needs.

  • Phase Failure Protection: Ensures safe shutdown during phase loss.

  • Compact Design: Easily mounts with contactors for space-saving installation.

  • Indicator Display: Provides clear trip status for quick troubleshooting.

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