TBC-440M Miniature Circuit Breaker (MCB) 4P 40A 6kA

Name: TBC-440M Miniature Circuit Breaker (MCB) 4P 40A 6kA
Brand: TBC
SKU: TBC-440M

TBC-440M

The TBC-440M is a professional-grade 4-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

4-pole configuration for comprehensive three-phase and neutral protection
40A rated current capacity for medium to high-load applications
Type C tripping curve optimized for inductive loads and general-purpose circuits
6kA breaking capacity ensures reliable 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
Standard 35mm DIN rail mounting for quick and easy installation
Wide operating temperature range from -35°C to +70°C
High mechanical durability rated for 20,000 switching cycles
Compact design with 72mm width (18mm per pole)
IEC 60898-1 compliant with CE, CB, and TÜV certifications
IP20 degree of protection suitable for enclosed distribution boards

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The TBC-440M miniature circuit breaker represents a reliable solution for modern electrical distribution systems requiring robust four-pole protection. Designed to meet the demanding requirements of both commercial and industrial installations, this MCB combines proven thermal-magnetic technology with precision engineering to ensure consistent performance and long service life.

With its Type C tripping characteristic, the TBC-440M is specifically suited for circuits with moderate inrush currents, including lighting systems, motor loads, and general power distribution. The 6kA breaking capacity provides adequate protection for most standard installations, while the compact 4-pole design allows for efficient use of distribution board space.

Built to international standards and certified by leading testing authorities, the TBC-440M offers peace of mind through compliance with IEC 60898-1 and multiple safety certifications. The robust construction ensures reliable operation across a wide temperature range, making it suitable for diverse environmental conditions from cold storage facilities to warm industrial environments.

Trip Technology: The TBC-440M employs thermal-magnetic trip technology, combining a bimetallic thermal element for overload protection with an electromagnetic release for instantaneous short-circuit protection. The Type C characteristic provides tripping at 5-10 times the rated current, making it ideal for circuits with moderate inrush currents.

Breaking Performance: With a rated breaking capacity of 6kA at 415V AC, this MCB can safely interrupt fault currents up to 6,000 amperes. The ultra-fast tripping time of less than 0.1 seconds minimizes potential damage to connected equipment and wiring during fault conditions.

Construction & Mounting: The circuit breaker features a durable thermoplastic housing with flame-retardant properties. Standard 35mm DIN rail mounting clips enable tool-free installation and removal. The toggle control mechanism provides clear ON/OFF indication and manual trip testing capability.

Durability & Reliability: Engineered for long service life, the TBC-440M is rated for 20,000 mechanical operations and 4,000 electrical operations at rated current. High-quality contact materials ensure low contact resistance and minimal heat generation during normal operation.

Environmental Performance: The wide operating temperature range of -35°C to +70°C and humidity tolerance up to 95% RH make this MCB suitable for challenging installation environments. IP20 protection rating ensures safe operation when installed in appropriate enclosures.

Residential distribution boards and consumer units for whole-house protection
Commercial building electrical panels and sub-distribution boards
Light industrial installations including workshops and manufacturing facilities
Three-phase motor control and protection circuits
HVAC system protection and control panels
Lighting distribution systems in commercial and industrial buildings
General low-voltage protection circuits requiring four-pole isolation
Renewable energy systems including solar inverter protection
Data center and IT equipment power distribution
Retail and hospitality electrical distribution systems

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)	40 A
Number of Poles	4P
Tripping Technology	Thermal-Magnetic
Tripping Curve	Type C
Tripping Time	t < 0.1 s
Breaking Capacity (Icn)	6 kA
Mechanical Characteristics
Control Type	Toggle Switch
Mounting Type	DIN Rail (35 mm)
Mechanical Durability	20,000 cycles
Electrical Durability	4,000 cycles
Physical Dimensions
Height	78 mm
Width	72 mm (18 mm per pole)
Depth	66 mm
Environmental Conditions
Operating Temperature	-35 °C to +70 °C
Relative Humidity	0 – 95 %
Degree of Protection	IP20
Standards & Compliance
Compliance Standard	IEC 60898-1
Certifications	CE, CB, TÜV

TBC-440M Miniature Circuit Breaker (MCB) 4P 40A 6kA

Key Features

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