TBC-425M Miniature Circuit Breaker (MCB) 4P 25A 6kA

Name: TBC-425M Miniature Circuit Breaker (MCB) 4P 25A 6kA
Brand: TBC
SKU: TBC-425M

TBC-425M

The TBC-425M is a professional-grade 4-pole miniature circuit breaker engineered to deliver dependable overload and short-circuit protection in low-voltage electrical distribution networks. Featuring advanced thermal-magnetic trip technology with Type C characteristics, this MCB is ideal for residential, commercial, and light industrial applications where reliable circuit protection is essential.

Key Features

4-pole configuration for comprehensive three-phase and neutral protection
25A rated current capacity suitable for medium-load circuits
Type C tripping curve optimized for inductive loads and motor circuits
6kA breaking capacity for effective short-circuit interruption
Thermal-magnetic trip technology for dual protection against overloads and short circuits
Fast tripping time of less than 0.1 seconds for enhanced safety
DIN rail mounting (35mm) for quick and easy installation
Wide operating temperature range from -35°C to +70°C
High mechanical durability rated for 20,000 cycles
Compliant with IEC 60898-1 international standards
CE, CB, and TÜV certified for quality assurance
Compact design with IP20 degree of protection

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The TBC-425M miniature circuit breaker represents a robust solution for protecting electrical circuits in diverse environments. Its 4-pole design ensures complete protection for three-phase systems including the neutral conductor, making it particularly suitable for balanced load distribution in commercial and industrial settings.

Equipped with Type C tripping characteristics, this MCB is specifically designed to handle circuits with moderate inrush currents, such as those found in lighting systems, small motors, and transformers. The thermal-magnetic trip mechanism provides dual-layer protection: the thermal element guards against sustained overloads, while the magnetic element responds instantly to short-circuit conditions.

Built to withstand demanding operational conditions, the TBC-425M features exceptional mechanical durability with a lifecycle of 20,000 operations and electrical durability of 4,000 cycles. The toggle control mechanism ensures intuitive operation, while the standard 35mm DIN rail mounting facilitates straightforward installation in distribution boards and enclosures.

With its compact footprint and IP20 protection rating, this circuit breaker is designed for indoor installation in controlled environments. The wide operating temperature range and high humidity tolerance make it adaptable to various climatic conditions, ensuring consistent performance across different geographical locations.

Tripping Characteristics: The Type C tripping curve is calibrated to trip between 5 and 10 times the rated current (In), making it ideal for circuits with moderate inrush currents. The thermal-magnetic mechanism ensures selective coordination and prevents nuisance tripping while maintaining rapid response to fault conditions.

Breaking Capacity: With a rated short-circuit breaking capacity of 6kA at 415V AC, the TBC-425M provides adequate protection for most residential and light commercial installations. The breaking capacity is tested and certified according to IEC 60898-1 standards.

Electrical Performance: Designed for AC networks operating at 50/60 Hz, the breaker is rated for 415V AC with a rated impulse voltage withstand of 4kV, ensuring protection against voltage surges and transient overvoltages.

Installation Requirements: The breaker mounts on standard 35mm DIN rail and occupies 4 modules of space (72mm width). Proper torque settings should be applied to terminal connections to ensure reliable electrical contact and prevent overheating. Ambient temperature during operation should be maintained within the specified range for optimal performance.

Compliance & Standards: Manufactured in accordance with IEC 60898-1 international standard for miniature circuit breakers. The product carries CE marking for European conformity, CB certification for international recognition, and TÜV approval for quality and safety assurance.

Residential distribution boards and consumer units for household circuit protection
Commercial buildings including offices, retail spaces, and public facilities
Light industrial installations such as workshops and small manufacturing units
Three-phase motor protection circuits with moderate starting currents
Lighting distribution systems in commercial and industrial environments
HVAC equipment protection in building management systems
General low-voltage protection circuits requiring 4-pole isolation
Electrical panels and sub-distribution boards in multi-tenant buildings
Backup power systems and generator distribution panels
Renewable energy installations including solar inverter protection circuits

Parameter	Specification
Electrical Characteristics
Rated Voltage (Un)	415 V AC
Rated Frequency	50 / 60 Hz
Rated Impulse Voltage	4 kV
Network Type	AC
Rated Current (In)	25 A
Number of Poles	4P
Tripping Technology	Thermal-Magnetic
Tripping Curve	Type C
Tripping Time	t < 0.1 s
Breaking Capacity	6 kA
Mechanical Characteristics
Control Type	Toggle
Mounting Type	DIN Rail (35 mm)
Mechanical Durability	20,000 cycles
Electrical Durability	4,000 cycles
Physical Dimensions
Height	78 mm
Width	72 mm
Depth	66 mm
Environmental Conditions
Operating Temperature	-35 °C to +70 °C
Relative Humidity	0 – 95 %
Degree of Protection	IP20
Standards & Certifications
Compliance Standard	IEC 60898-1
Certifications	CE, CB, TÜV

TBC-425M Miniature Circuit Breaker (MCB) 4P 25A 6kA

Key Features

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