The TBC-350M is a robust 3-pole miniature circuit breaker engineered to deliver dependable overload and short-circuit protection in low-voltage electrical distribution systems. Featuring advanced thermal-magnetic trip technology with Type C characteristics, this MCB is ideal for safeguarding circuits in residential, commercial, and light industrial environments where reliable protection and long service life are essential.
The TBC-350M miniature circuit breaker represents a perfect balance of performance, reliability, and value for three-phase electrical protection applications. Designed with precision engineering, this 3-pole MCB provides comprehensive protection against both overload conditions and short-circuit faults in 415V AC systems.
Its Type C tripping characteristic makes it particularly well-suited for circuits with moderate inductive loads, including lighting circuits with transformers, small motors, and general power distribution. The thermal-magnetic mechanism ensures accurate discrimination between normal inrush currents and genuine fault conditions, minimizing nuisance tripping while maintaining robust protection.
Built to international standards and certified by leading testing authorities, the TBC-350M offers peace of mind for electrical contractors, facility managers, and system designers. The compact modular design allows for efficient use of panel space, while the standard DIN rail mounting ensures compatibility with existing infrastructure. With proven durability through 20,000 mechanical operations and 4,000 electrical operations, this MCB delivers long-term reliability in demanding applications.
Whether you're designing a new installation or upgrading existing protection systems, the TBC-350M provides the performance and certification credentials required for professional electrical installations across residential, commercial, and light industrial sectors.
Trip Mechanism: The TBC-350M employs a dual-element thermal-magnetic trip mechanism. The thermal element provides time-delayed protection against sustained overload conditions, while the magnetic element delivers instantaneous protection against short-circuit faults. The Type C characteristic is calibrated to trip between 5 and 10 times the rated current, making it ideal for circuits with moderate inrush currents.
Breaking Capacity: With a rated breaking capacity of 6kA at 415V AC, this MCB is suitable for most standard low-voltage distribution networks. The breaking capacity represents the maximum prospective short-circuit current the device can safely interrupt without damage.
Electrical Ratings: Rated for 415V AC operation at 50/60Hz, the TBC-350M handles a continuous current of 50A per pole. The rated impulse withstand voltage of 4kV provides protection against transient overvoltages commonly encountered in electrical distribution systems.
Construction: The circuit breaker features a robust thermoplastic housing with silver-alloy contacts for reliable current interruption. Internal arc chutes safely extinguish fault arcs, while the toggle mechanism provides clear ON/OFF indication and manual trip testing capability.
Installation: Designed for standard 35mm DIN rail mounting, the TBC-350M can be easily installed and removed without tools. The compact 54mm width (3 modules) allows efficient use of distribution board space. Terminal capacity accommodates conductors up to 25mm² (copper) for secure connections.
Environmental Performance: Engineered to operate reliably across a wide temperature range (-35°C to +70°C) and humidity conditions up to 95% RH, the TBC-350M is suitable for diverse installation environments. The IP20 rating provides protection against solid objects greater than 12.5mm.
| Parameter | Specification |
|---|---|
| Electrical Characteristics | |
| Product Type | Miniature Circuit Breaker (MCB) |
| Number of Poles | 3P |
| Rated Current (In) | 50 A |
| Rated Voltage (Un) | 415 V AC |
| Rated Frequency | 50 / 60 Hz |
| Rated Impulse Voltage | 4 kV |
| Network Type | AC |
| Tripping Technology | Thermal-Magnetic |
| Tripping Curve | Type C (5-10 × In) |
| Tripping Time | t < 0.1 s |
| Breaking Capacity (Icn) | 6 kA |
| Mechanical Characteristics | |
| Control Type | Toggle Switch |
| Mounting Type | DIN Rail (35 mm) |
| Mechanical Durability | 20,000 cycles |
| Electrical Durability | 4,000 cycles |
| Physical Dimensions | |
| Height | 78 mm |
| Width | 54 mm (3 modules) |
| Depth | 66 mm |
| Environmental Conditions | |
| Operating Temperature | -35 °C to +70 °C |
| Relative Humidity | 0 – 95 % (non-condensing) |
| Degree of Protection | IP20 |
| Standards & Compliance | |
| International Standard | IEC 60898-1 |
| Certifications | CE, CB, TÜV |
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