TBC-340M Miniature Circuit Breaker (MCB) 3P 40A 6kA

Electrical Performance: The TBC-340M is rated for 415V AC operation at 50/60 Hz, with a rated current of 40A. It features a 6kA breaking capacity, sufficient for most residential and commercial applications. The rated impulse voltage of 4kV provides protection against transient overvoltages. The Type C tripping curve is calibrated to trip between 5 and 10 times the rated current for magnetic operation, making it ideal for circuits with moderate inrush currents.

Trip Mechanism: The thermal-magnetic trip mechanism combines two complementary protection methods. The thermal element uses a bimetallic strip that bends under sustained overload conditions, eventually triggering the trip mechanism. The magnetic element employs an electromagnet that responds instantaneously to short-circuit currents, providing fast fault clearance with tripping times under 0.1 seconds.

Construction and Materials: The breaker housing is manufactured from high-quality thermoplastic materials that provide excellent electrical insulation, mechanical strength, and flame resistance. Internal contacts are designed for low contact resistance and high arc interruption capability. The toggle mechanism provides clear ON/OFF indication and positive contact operation.

Installation Requirements: The TBC-340M mounts on standard 35mm DIN rails according to IEC 60715. The compact 54mm width (3 modules) allows efficient use of panel space. Terminals accommodate wire sizes suitable for 40A applications, with proper torque specifications ensuring reliable connections. The IP20 rating requires installation within an appropriate enclosure for protection against direct contact and ingress of solid objects larger than 12.5mm.

Environmental Considerations: With an operating temperature range of -35°C to +70°C and humidity tolerance up to 95% (non-condensing), the TBC-340M performs reliably in diverse climatic conditions. Proper derating should be applied when operating at elevated ambient temperatures or when multiple breakers are installed in close proximity.

• Residential Distribution Boards: Main and sub-circuit protection in single-family homes, apartments, and multi-dwelling units
• Commercial Buildings: Protection of lighting circuits, HVAC systems, and general power distribution in offices, retail spaces, and public facilities
• Light Industrial Installations: Motor control circuits, machinery protection, and workshop power distribution
• Three-Phase Equipment Protection: Safeguarding pumps, compressors, fans, and other three-phase loads
• Distribution Panels: Main and branch circuit protection in low-voltage switchboards and control panels
• Renewable Energy Systems: AC circuit protection in solar inverter installations and wind power systems
• Building Services: Protection of elevator circuits, fire alarm systems, and emergency lighting
• Data Centers: Power distribution and circuit protection for IT equipment and cooling systems
• Educational Facilities: Electrical protection in schools, universities, and training centers
• Healthcare Facilities: Non-critical circuit protection in clinics, medical offices, and hospital support areas