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Tertiary circuit breakers up to 6 Ka
Tertiary circuit breakers up to 6 kA are compact overcurrent protection devices designed for low-fault-current applications, typically in final distribution circuits. These single-pole (1P) or double-pole (2P) units are rated for short-circuit capacities up to 6 kA per IEC 60898-1, with nominal currents ranging from 6 A to 63 A at 230/400 V AC. ...
Tertiary circuit breakers up to 6 kA are compact overcurrent protection devices designed for low-fault-current applications, typically in final distribution circuits. These single-pole (1P) or double-pole (2P) units are rated for short-circuit capacities up to 6 kA per IEC 60898-1, with nominal currents ranging from 6 A to 63 A at 230/400 V AC. They feature thermal-magnetic trip mechanisms for overload and short-circuit protection, with B, C, or D tripping curves to match different load types. The modular design allows DIN-rail mounting in consumer units or small distribution boards, with optional accessories like shunt trips, auxiliary contacts, and undervoltage releases. Known globally as miniature circuit breakers (MCBs), mini-breakers, or simply tertiary breakers, these devices are essential for protecting lighting, socket outlets, and small appliances in residential and light commercial installations.
These circuit breakers are primarily installed in tertiary distribution panels, consumer units, and final sub-distribution boards within residential buildings, small offices, retail shops, and hospitality facilities. They protect branch circuits feeding lighting systems, general-purpose socket outlets, HVAC units, and small motor loads. In industrial settings, they serve as backup protection for control circuits and auxiliary equipment. Their compact size makes them ideal for space-constrained enclosures, while the 6 kA breaking capacity is sufficient for most low-fault-level installations. Common applications include apartment complexes, school buildings, medical clinics, and light commercial workshops where coordination with upstream main breakers is required.
Key subcategories include single-pole MCBs (1P), double-pole MCBs (2P), and triple-pole MCBs (3P) with B, C, and D curves. Typical article codes follow patterns like SI0503-1P-B16 for a 16 A single-pole B-curve breaker, or SI0503-2P-C32 for a 32 A double-pole C-curve unit. The code structure generally indicates: product family (SI0503), number of poles (1P/2P/3P), tripping curve (B/C/D), and rated current in amperes (6-63). Additional variants include 1P+N units with switched neutral, and high-impedance versions for specific applications. All units comply with IEC 60898-1 and carry relevant CE markings.
Electric Automation Network provides express worldwide shipping for all tertiary circuit breaker orders, ensuring rapid delivery to any location. Our team of specialized electrical engineers offers personalized technical support for product selection, coordination studies, and compliance verification. Each product listing includes detailed technical datasheets, wiring diagrams, and real-time pricing. We maintain extensive stock of all common ratings and curves, with same-day dispatch for orders placed before 2 PM CET. Whether you need a single replacement MCB or bulk quantities for a large project, our engineering team ensures you receive the right protection devices for your specific application.
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