The TBC-3125Z is a high-performance 3-pole miniature circuit breaker engineered to deliver dependable protection for distribution circuits in demanding industrial and commercial environments. Featuring advanced thermal-magnetic tripping technology and a robust 10kA breaking capacity, this MCB ensures optimal safety and reliability for low-voltage electrical installations rated up to 415V AC.
The TBC-3125Z Miniature Circuit Breaker represents a professional-grade solution for protecting three-phase electrical distribution systems. Designed with precision engineering and manufactured to international standards, this MCB combines thermal and magnetic tripping mechanisms to provide comprehensive protection against both sustained overloads and sudden short-circuit faults.
With its 125A current rating and 10kA breaking capacity, the TBC-3125Z is specifically suited for industrial control panels, commercial power distribution boards, and other applications requiring robust circuit protection. The Type C tripping characteristic makes it particularly effective for circuits with inductive loads, motors, and transformers where inrush currents are common.
Built for longevity and reliability, this circuit breaker features a durable construction capable of withstanding 20,000 mechanical operations and 4,000 electrical switching cycles. The standard DIN rail mounting system ensures compatibility with existing electrical enclosures and facilitates rapid installation or replacement during maintenance operations.
Operating reliably across a wide temperature range from -35°C to +70°C and in humidity conditions up to 95%, the TBC-3125Z is engineered to perform consistently in challenging environmental conditions while maintaining full compliance with IEC 60947-2 international safety standards.
Tripping Technology: The TBC-3125Z employs thermal-magnetic tripping technology, combining a bimetallic thermal element for overload protection with an electromagnetic release for instantaneous short-circuit protection. The Type C tripping curve provides a tripping range of 5-10 times the rated current, making it suitable for circuits with moderate inrush currents.
Breaking Capacity: With a rated short-circuit breaking capacity of 10kA at 415V AC, this MCB can safely interrupt fault currents up to 10,000 amperes, providing reliable protection in most industrial and commercial installations.
Electrical Characteristics: Rated for 415V AC operation at 50Hz frequency, the device is designed for standard three-phase network configurations. The 125A rated current (In) represents the maximum continuous current the breaker can carry without tripping under normal ambient conditions.
Mechanical Design: The compact 81mm × 81mm × 77mm housing is engineered for DIN rail mounting, occupying minimal panel space while providing robust mechanical protection rated to IP20. The toggle control mechanism enables manual ON/OFF operation and provides clear visual indication of circuit status.
Endurance & Reliability: Tested to 20,000 mechanical operations and 4,000 electrical switching cycles, the TBC-3125Z is built for long-term reliability in demanding applications. The wide operating temperature range (-35°C to +70°C) and humidity tolerance (0-95%) ensure consistent performance across diverse environmental conditions.
Standards Compliance: Fully compliant with IEC 60947-2 international standards for low-voltage switchgear and controlgear. CE marking confirms conformity with European safety, health, and environmental protection requirements.
| Parameter | Specification |
|---|---|
| Product Type | Miniature Circuit Breaker (MCB) |
| Model Number | TBC-3125Z |
| Number of Poles | 3P (Three Pole) |
| Rated Current (In) | 125 A |
| Rated Voltage (Un) | 415 V AC |
| Frequency | 50 Hz |
| Network Type | AC |
| Tripping Technology | Thermal-Magnetic |
| Tripping Curve | Type C (5-10 × In) |
| Breaking Capacity (Icu) | 10 kA |
| Mounting Type | DIN Rail (35mm) |
| Control Type | Toggle Switch |
| Mechanical Endurance | 20,000 cycles |
| Electrical Endurance | 4,000 cycles |
| Height | 81 mm |
| Width | 81 mm |
| Depth | 77 mm |
| Operating Temperature | -35°C to +70°C |
| Relative Humidity | 0 – 95% (non-condensing) |
| Degree of Protection | IP20 |
| Standards Compliance | IEC 60947-2 |
| Certification | CE Marking |
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