No products
Product successfully added to your shopping cart
Viewed products
-
UDP100102 ELDON...
ARM.POL. 1000x1000x320 2P, ARM.POL....
-
DABP081609TE ELDON...
Terminal box, 80x160x86
-
DABP081209TE ELDON...
Terminal box, 80x120x86
-
-
FIL-1S-1-10A-230AC-PT...
EMC filter (mains filter) for...
-
FIL-1S-1-6A-230AC-UT...
EMC filter (mains filter) for...
TERTIARY CIRCUIT BREAKERS
Tertiary circuit breakers, also known as miniature circuit breakers (MCBs) or final distribution circuit breakers, are the backbone of modern electrical safety in low-voltage installations. These devices are designed to protect downstream circuits against overloads and short circuits, typically rated for currents up to 125 A and voltages up to 4...
Tertiary circuit breakers, also known as miniature circuit breakers (MCBs) or final distribution circuit breakers, are the backbone of modern electrical safety in low-voltage installations. These devices are designed to protect downstream circuits against overloads and short circuits, typically rated for currents up to 125 A and voltages up to 440 V AC. They come in various pole configurations, including 1P, 1P+N, 2P, 3P, 3P+N, and 4P, with breaking capacities ranging from 6 kA to 25 kA depending on the application. The trip curves—B, C, D, K, and Z—define the instantaneous tripping thresholds, making them suitable for resistive, inductive, or motor loads. In some regions, they are referred to as plug-in circuit breakers or DIN rail breakers due to their standardized mounting on 35 mm DIN rails. Their compact design and modularity allow for easy integration into distribution boards, ensuring selective coordination with upstream protective devices.
These circuit breakers are predominantly installed in tertiary sector buildings such as offices, commercial centers, hospitals, schools, and hotels, where they protect lighting circuits, general-purpose sockets, HVAC systems, and small motor loads. They are also critical in residential applications for final subcircuits. In industrial environments, they serve as backup protection for control panels and automation cabinets, often paired with residual current devices (RCDs) to provide earth fault protection. Their use extends to temporary power distribution in construction sites and event setups, where quick installation and reliability are paramount. The standardized form factor ensures compatibility with busbar systems and modular accessories like auxiliary contacts, shunt trips, and undervoltage releases.
Within this category, key subcategories include high-performance MCBs with enhanced breaking capacity (up to 25 kA) for industrial panels, and compact MCBs for residential distribution. Common article codes follow patterns like LE09-1P-C16 (single-pole, 16 A, curve C) or LE09-3P-D32 (three-pole, 32 A, curve D). The code structure typically includes the series prefix (e.g., LE09), pole count, current rating in amperes, and trip curve letter. For example, LE09-2P-B10 indicates a two-pole breaker rated at 10 A with a B curve for sensitive loads. Other variants include LE09-4P-C63 for three-phase circuits up to 63 A, and LE09-1P+N-C20 for single-phase with neutral protection. These breakers are available with or without integrated RCD functionality, and some models feature plug-in or screw-type terminals for flexible wiring.
Partnering with Electric Automation Network ensures access to genuine tertiary circuit breakers from leading manufacturers, with real-time pricing and stock visibility. Our engineering team provides personalized technical support to help select the correct trip curve, pole configuration, and breaking capacity for your specific load profile. We offer express worldwide shipping, ensuring critical components arrive within days, not weeks. Each product listing includes detailed technical datasheets, wiring diagrams, and compliance certifications (IEC 60898, IEC 60947-2). Whether you need a single unit for a repair or bulk quantities for a large-scale project, our platform streamlines procurement with multilingual support and dedicated account management.
All ratings we receive from the items we offer are real and verified. A small gesture, but a lot of value. That's why we thank you for that minute you invest in leaving us your opinion and qualification about the products, because it helps us to continue improving and to offer you a service of even higher quality.