Miniature Circuit Breaker

The Miniature Circuit Breaker (MCB) is the core protection device in low-voltage power distribution systems. It is an indispensable "circuit guardian" in residential, commercial, and industrial power distribution systems.

/HX1 Series Miniature Circuit Breaker

HX1

General Purpose Miniature Circuit Breaker

The HX1 Series Miniature Circuit Breaker is designed for reliable overload and short-circuit protection in residential and commercial power distribution systems. Ideal for residential buildings, commercial panels, lighting circuits, and OEM electrical equipment.

/10kA Industrial MCB | 0.5-63A 1P-4P EN/IEC60898

HX2

10kA Industrial Miniature Circuit Breaker

Designed for industrial low-voltage distribution systems requiring higher breaking capacity and stable circuit protection. Suitable for industrial control panels, machinery, factories, and commercial distribution boards.

/HX3 Series Miniature Circuit Breaker

HX3

6kA Residential Miniature Circuit Breaker

The HX3 Series provides dependable protection for household electrical circuits with compact installation and reliable tripping performance. Homes, apartments, office buildings, lighting systems, and distribution boxes.

/HX5 Series Miniature Circuit Breaker

HX5

10kA Compact Miniature Circuit Breaker

The HX5 Series combines compact size with 10kA breaking performance, making it suitable for high-density electrical panels. Commercial buildings, OEM panels, switchboards, renewable energy systems, and industrial equipment.

Moulded case circuit breakers

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Select Your Miniature Circuit Breaker

Choose the right moulded case circuit breaker for your application: from rated current and breaking capacity to trip units and accessories. Hongxi MCCB lines cover residential through heavy industrial duty with clear, comparable specifications.

High Breaking
Adjustable Setting
100% Ics
690V Ui

Miniature Circuit Breaker Parameter Overview

Feature/Parameter	Model ZR-AMB 360 (Standard)	Model ZR-AMB 360 (Extended)	Model ZR-AMB 360 (Premium)
Core Positioning	Main distribution protection	Commercial & industrial	Heavy-duty plants
Max. Production Speed	Standard throughput	Optimized throughput	Peak throughput
Rated operational voltage Ue	AC 400V / 690V	AC 400V / 690V	AC 400V / 690V
Breaking capacity ICU	36 kA	50 kA	65 kA
Service breaking capacity Ics	100% Icu	100% Icu	100% Icu
Thermal-magnetic release	Adjustable	Adjustable	Adjustable

Quality testing and certification

Quality You Can Rely On

Our manufacturing and testing processes are built around international standards. Products are developed and verified against IEC/EN 60947-2 and related norms, with ISO 9001 quality management and CE marking where applicable—so you get consistent performance and traceability.

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Regarding the Q&A on Miniature Circuit Breaker

What is the difference between 4.5kA, 6kA, and 10kA breaking capacity?

The breaking capacity is the maximum fault current the MCB can safely interrupt without damage. 4.5kA (HX3) is suitable for residential use where the available fault current is low. 6kA (HX3 higher version, HX2/HX5 option) is common for commercial buildings and the light industry. 10kA (HX2, HX5) is recommended for industrial applications or locations close to the transformer where fault current can be high. Choose based on the calculated short-circuit current at your installation point.

How do I choose between B, C, and D trip curves?

The curve determines at what multiple of rated current the MCB trips magnetically (short-circuit). B curve (3-5 times In) is for resistive loads or long cable runs (e.g., heating, lighting). C curve (5-10 times In) is for moderate inrush loads (e.g., small motors, fluorescent lighting, coils) and is the most common choice. D curve (10-20 times In) is for high inrush loads (e.g., large motors, transformers, welding equipment). Match the curve to your load type to avoid nuisance tripping during startup.

Will a 1P MCB fit into my existing distribution board?

Yes, if your board has standard 18mm per pole spacing. All HX series MCBs (HX1, HX2, HX3, HX5) have a width of 18mm per pole, so 1P = 18mm, 2P = 36mm, 3P = 54mm, 4P = 72mm. They mount on a standard 35mm DIN rail. Measure your board’s rail and available width before ordering.

Does temperature affect the MCB’s tripping characteristics?

Yes. The thermal trip element (bimetal) is temperature-sensitive. At higher ambient temperatures, the MCB trips earlier; at lower temperatures, it trips later. Our HX series datasheet includes a temperature compensation correction table. For example, at 50°C, multiply your load current by 0.80–0.96 to select the correct rating. For hot environments, use a derated MCB or choose a higher current rating.

Can I replace my existing MCB (e.g., Schneider, ABB, Chint) with an HX series MCB?

In most cases, yes, provided three physical conditions are met: same pole configuration (1P, 2P, 3P, 4P), same width (18mm per pole), and same terminal type (pin type, and same cage size for the cable). Electrically, also match rated current (In), trip curve (B/C/D), and ensure breaking capacity is sufficient for your installation. We can help you visually match your existing product – send us a photo.

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