TBC-320M Miniature Circuit Breaker (MCB) 3P 20A 6kA

Name: TBC-320M Miniature Circuit Breaker (MCB) 3P 20A 6kA
Brand: TBC
SKU: TBC-320M

TBC-320M

The TBC-320M is a high-performance 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 tripping characteristics, this MCB is ideal for safeguarding circuits in residential, commercial, and light industrial environments where reliable protection is essential.

Key Features

3-pole configuration for three-phase circuit protection
20A rated current capacity for medium-load applications
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
Compact design: 54mm width for space-efficient panel integration
Wide operating temperature range: -35°C to +70°C
High mechanical durability: 20,000 cycles
IP20 degree of protection
Compliant with IEC 60898-1 international standards
CE, CB, and TÜV certified for quality assurance

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The TBC-320M miniature circuit breaker represents a robust solution for three-phase electrical protection in demanding environments. Its thermal-magnetic tripping mechanism combines a bimetallic element for overload protection with an electromagnetic release for instantaneous short-circuit protection, ensuring comprehensive circuit safety.

Designed with Type C tripping characteristics, this MCB is particularly well-suited for circuits with moderate inrush currents, including lighting circuits, distribution boards, and equipment with inductive loads. The 6kA breaking capacity provides adequate protection for most residential and commercial installations, while the compact 3-module width (54mm) allows for efficient use of distribution board space.

Built to withstand harsh environmental conditions, the TBC-320M operates reliably across a temperature range of -35°C to +70°C and tolerates humidity levels up to 95%. The toggle control mechanism ensures simple manual operation, while the DIN rail mounting system facilitates rapid installation and replacement. With a mechanical life of 20,000 cycles and electrical durability of 4,000 cycles, this MCB delivers long-term reliability and reduced maintenance requirements.

Tripping Characteristics: The TBC-320M employs Type C tripping characteristics, with magnetic trip activation occurring between 5 and 10 times the rated current (In). This makes it ideal for circuits with moderate inrush currents such as fluorescent lighting, small motors, and transformers.

Breaking Capacity: With a rated short-circuit breaking capacity of 6kA at 415V AC, this MCB provides adequate protection for most residential and light commercial installations. The breaking capacity represents the maximum fault current the device can safely interrupt without damage.

Thermal-Magnetic Technology: The integrated thermal element responds to sustained overload conditions by heating a bimetallic strip that mechanically trips the breaker. The magnetic element provides instantaneous protection against short circuits by using electromagnetic force to trigger immediate disconnection.

Rated Impulse Voltage: The 4kV impulse voltage rating indicates the device's ability to withstand transient overvoltages without breakdown, providing additional protection against lightning strikes and switching surges.

Installation: Standard 35mm DIN rail mounting ensures compatibility with most modern distribution boards and enclosures. The three-pole configuration requires three module spaces (54mm total width) in the distribution panel.

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 with moderate electrical loads
Three-phase motor protection circuits in HVAC systems and pumping applications
Distribution panels in apartment buildings and multi-tenant properties
Protection of lighting circuits with inductive ballasts and LED drivers
Small commercial kitchen equipment and appliance circuits
General low-voltage protection in electrical sub-distribution systems
Backup power distribution systems and generator circuits
Agricultural installations and farm building electrical systems

Parameter	Specification
Model Number	TBC-320M
Product Type	Miniature Circuit Breaker (MCB)
Number of Poles	3P
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	t < 0.1 s
Breaking Capacity	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	54 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-320M Miniature Circuit Breaker (MCB) 3P 20A 6kA

Key Features

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