TBC-325M Miniature Circuit Breaker (MCB) 3P 25A 6kA

Trip Mechanism Technology
The TBC-325M employs a sophisticated thermal-magnetic trip mechanism that combines two complementary protection methods. The thermal element provides time-delayed protection against sustained overload conditions, while the magnetic element delivers instantaneous protection against short-circuit faults. This dual-protection approach ensures comprehensive circuit safety across the full range of fault conditions.

Type C Tripping Characteristics
The Type C tripping curve is specifically designed for circuits with moderate inductive loads. The magnetic trip operates between 5 and 10 times the rated current (125A to 250A for this 25A model), providing the necessary discrimination to avoid nuisance tripping during normal inrush currents while still delivering fast protection during genuine fault conditions.

Breaking Capacity
With a rated breaking capacity of 6kA at 415V AC, the TBC-325M can safely interrupt fault currents up to 6,000 amperes. This breaking capacity is suitable for most residential and commercial installations where prospective short-circuit currents are within this range. The rated impulse voltage of 4kV provides additional protection against transient overvoltages.

Installation and Mounting
The circuit breaker is designed for standard 35mm DIN rail mounting, allowing for quick snap-on installation without the need for additional mounting hardware. The toggle control mechanism provides clear ON/OFF indication and manual operation for testing and maintenance purposes.

Environmental Performance
Rated for IP20 protection, the TBC-325M is suitable for installation in standard indoor electrical enclosures where protection against solid objects larger than 12.5mm is required. The wide operating temperature range and high humidity tolerance ensure reliable performance in various climatic conditions.

• Residential distribution boards and consumer units for three-phase supply protection
• Commercial building electrical installations including offices, retail spaces, and public facilities
• Light industrial facilities and workshops requiring reliable circuit protection
• Three-phase motor control circuits and pump installations
• HVAC system protection circuits in commercial and industrial settings
• Lighting distribution circuits with transformers and inductive ballasts
• General-purpose low-voltage protection in electrical panels and switchboards
• Renovation and upgrade projects requiring modern circuit protection standards
• Multi-tenant buildings and apartment complexes with three-phase distribution
• Small manufacturing facilities and production equipment protection