TBC-420M Miniature Circuit Breaker (MCB) 4P 20A 6kA

Name: TBC-420M Miniature Circuit Breaker (MCB) 4P 20A 6kA
Brand: TBC
SKU: TBC-420M

TBC-420M

The TBC-420M 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
20A 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 switching 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-420M 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 combines a bimetallic strip for overload protection with an electromagnetic coil for instantaneous short-circuit protection, ensuring comprehensive circuit safety.

Built to withstand demanding operational conditions, the TBC-420M features exceptional mechanical and electrical durability, with ratings of 20,000 and 4,000 cycles respectively. Its compact 72mm width (18mm per pole) allows for efficient use of panel space while maintaining easy accessibility for manual operation and maintenance.

The device operates reliably across a wide temperature range and maintains performance in humidity levels up to 95%, making it suitable for various installation environments. Full compliance with IEC 60898-1 standards and multiple international certifications ensure that the TBC-420M meets the highest safety and performance requirements.

Trip Characteristics: The Type C tripping curve provides instantaneous magnetic tripping at 5 to 10 times the rated current (In), making it ideal for circuits with moderate inductive loads. The thermal element responds to sustained overloads, while the magnetic element provides rapid protection against short circuits.

Breaking Capacity: With a rated short-circuit breaking capacity of 6kA at 415V AC, the TBC-420M can safely interrupt fault currents in typical residential and commercial installations. The breaking capacity is tested and certified according to IEC 60898-1 standards.

Electrical Coordination: The device is designed for use in AC networks at 50/60 Hz with a rated voltage of 415V AC. The rated impulse voltage of 4kV provides protection against transient overvoltages commonly encountered in electrical distribution systems.

Installation and Mounting: The MCB features standard 35mm DIN rail mounting for quick installation in distribution boards and enclosures. The toggle control mechanism provides clear ON/OFF indication and manual operation for testing and maintenance purposes.

Environmental Performance: Engineered to operate in temperatures ranging from -35°C to +70°C, the TBC-420M maintains reliable performance in extreme conditions. The IP20 protection rating ensures safety against solid objects larger than 12.5mm while being suitable for indoor installation environments.

Residential distribution boards and consumer units for multi-phase supply protection
Commercial building electrical installations including offices, retail spaces, and public facilities
Light industrial facilities requiring reliable circuit protection for machinery and equipment
Three-phase motor control circuits and pump installations
HVAC systems and air conditioning units in commercial applications
Lighting distribution circuits in commercial and industrial buildings
General low-voltage protection circuits in mixed-use developments
Electrical panels in educational institutions and healthcare facilities
Workshop and manufacturing equipment protection circuits
Building management systems and electrical infrastructure upgrades

Parameter	Specification
Model Number	TBC-420M
Product Type	Miniature Circuit Breaker (MCB)
Number of Poles	4P
Rated Current (In)	20 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
Tripping Time	< 0.1 s
Breaking Capacity (Icn)	6 kA
Control Type	Toggle
Mounting Type	DIN Rail (35 mm)
Mechanical Durability	20,000 cycles
Electrical Durability	4,000 cycles
Height	78 mm
Width	72 mm
Depth	66 mm
Operating Temperature	-35 °C to +70 °C
Relative Humidity	0 – 95 %
Degree of Protection	IP20
Standards Compliance	IEC 60898-1
Certifications	CE, CB, TÜV

TBC-420M Miniature Circuit Breaker (MCB) 4P 20A 6kA

Key Features

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