ABB THED136125 Thermal-magnetic circuit breaker

• 1. Product Overview

  The ABB THED136125 Thermal-magnetic Circuit Breaker is a low-voltage protection device that combines thermal and magnetic trip functions to protect circuits against overloads, short circuits, and electrical faults. The thermal element provides delayed response for overloads, while the magnetic element ensures instantaneous tripping in case of short circuits, safeguarding equipment and wiring.

  This circuit breaker is suitable for industrial, commercial, and residential low-voltage distribution systems and is widely used in distribution panels, motor protection, and critical load protection.

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  2. Technical Specifications

  • Model: THED136125

  • Type: Thermal-magnetic Circuit Breaker

  • Rated Current: 125 A

  • Number of Poles: 3

  • Rated Operating Voltage: AC 400/690 V

  • Breaking Capacity: 36 kA (AC-23A 400 V)

  • Rated Short-circuit Breaking Capacity (Icu): 36 kA

  • Characteristic Curve: Type C (suitable for general industrial and distribution loads)

  • Trip Mechanism: Thermal + Magnetic

  • Mechanical Life: > 10,000 operations

  • Electrical Life: > 1,500 operations

  • Mounting: DIN rail or screw fixing

  • Operating Temperature: -25 to +60 °C

  • Protection Rating: IP20

  • Dimensions (W × H × D): 90 × 110 × 78 mm

  • Weight: ~1.2 kg

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  3. Key Advantages & Features

  1. Dual Protection Mechanism
     Thermal trip provides overload protection, while magnetic trip rapidly interrupts short-circuit currents, ensuring circuit and equipment safety.

  2. High Breaking Capacity
     Maximum short-circuit breaking capacity of 36 kA, suitable for industrial and large distribution systems.

  3. High Reliability
     Industrial-grade design with long mechanical and electrical life for stable operation over time.

  4. Flexible Installation
     Mountable on DIN rails or by screws, convenient for distribution panel layouts.

  5. Intuitive Operation
     Clear ON/OFF handle for easy operation and status recognition.

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  4. Typical Applications

  • Industrial low-voltage distribution systems

  • Commercial building distribution panels

  • Motor and critical load protection

  • Automation production line electrical protection

  • HVAC systems and electrical equipment protection

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  5. Installation & Usage Notes

  1. Verify rated current, voltage, and characteristic curve match the load before installation.

  2. Ensure secure and correct wiring to prevent loose connections or poor contact.

  3. Install in well-ventilated environments, avoiding corrosive gases or dust accumulation.

  4. Power off before operation or maintenance to ensure safety.

  5. Periodically check breaker condition and contact wear to ensure long-term reliable operation.

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The structure and details of the product：

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