HUM18-63N MCB – 1P to 4P, 63A,Type B/C/D

HUM18-63N Miniature Circuit Breakers (MCBs) – 63A Terminal Distribution Breaker

The HUM18-63N Series Miniature Circuit Breakers (MCBs) from HUYU Electric are designed for terminal power distribution in residential, commercial, and light industrial installations. They operate at 50/60Hz AC voltage up to 400V, with 6kA breaking capacity. These breakers provide standard-compliant overload and short-circuit protection for final circuits and are certified under IEC 60898-1 and GB/T 10963.1. The series has also been independently validated by KEMA for European market compliance. Available configurations include 1P, 2P, 3P, 3P+N, and 4P, and they feature Type B, C, and D trip curves across 6A to 63A current ratings. Their modular design, full accessory support, top-in bottom-out wiring, and TH35-7.5 DIN rail mounting simplify panel assembly.

HUYU Electric, a manufacturer with over 36 years of experience, delivers OEM/ODM MCB solutions, complete with custom laser marking and comprehensive KEMA/IEC/GB documentation. These MCBs are an excellent alternative to products from leading brands such as Schneider, ABB, Hager, Eaton, Siemens, Legrand, Chint, and Havells.

1P to 4P & Type B/C/D Curves – One MCB Family, Every Configuration

All HUM18-63N breakers share the same 6kA breaking mechanism. Type B is designed for resistive loads like lighting and heating. Type C is suitable for inductive loads such as motors and pumps, while Type D is ideal for high-inrush current devices, including transformers and large motors. With configurations ranging from 1P to 4P, this family of products eliminates the need for sourcing from multiple vendors.

KEMA Certified – Independent Validation for European Markets

The HUM18-63N is certified by KEMA, a respected third-party certification authority for European markets. Additionally, the dual compliance with IEC 60898-1 and GB/T 10963.1 ensures the breaker is fit for both international and Chinese markets without requiring further certifications.

Offering an Icu equal to Ics at 6kA, these breakers operate reliably and remain functional even after clearing the maximum-rated fault. Additional specifications, including a 500V insulation voltage and 4kV impulse withstand, make these breakers exceptionally durable, withstanding up to 10,000 electrical and 20,000 mechanical life cycles.

Specifications

Factory-Direct OEM/ODM Supply for Wholesale Partners

Buyer’s Guide

How to Choose Your MCB – Current, Curve & Pole

A practical guide to selecting the right HUM18‑63N for your distribution board.

1. Current Rating – Match Your Load

The HUM18‑63N covers 6A to 63A. Lighting circuits: 6A–10A. Socket outlets: 16A–20A. Air conditioners and water heaters: 25A–40A. Sub-mains and larger equipment: 50A–63A. Derate for ambient temperature and apply grouping factors for side-by-side installation.

2. Trip Curve – Type B, C, or D?

Type B (3–5× In) for resistive loads — lighting, electric heating. Type C (5–10× In) for inductive loads — motors, pumps, HVAC. Type D (10–20× In) for high-inrush equipment — large transformers, industrial motors, x-ray machines. See the tripping characteristic curve above for precise time-current response across all three curve types.

3. Number of Poles – System Topology

1P for single-phase protection. 2P for two-pole isolation on 400V circuits. 3P and 3P+N for three-phase distribution. 4P for complete disconnection with neutral. All share identical per-pole width for efficient panel layout.

4. Installation Notes

Mounts on TH35‑7.5 DIN rail, top-in bottom-out wiring. Accepts 25mm² conductors at 2.0 N·m torque. Operates from -5°C to +45°C up to 2000m altitude. Pollution degree 2.

Frequently Asked Questions

What is the purpose of a miniature circuit breaker?

A miniature circuit breaker (MCB) automatically switches off an electrical circuit during overload or short-circuit conditions. It protects wiring and connected equipment from excessive current and prevents fire hazards. Unlike a fuse, it can be reset after tripping.

What is the difference between a mini circuit breaker and a regular circuit breaker?

The terms are often interchangeable. “Miniature circuit breaker” typically refers to modular DIN rail-mounted devices rated up to 125A, used in final distribution panels. “Regular circuit breaker” may refer to larger molded case circuit breakers (MCCBs) with higher ratings for main distribution.

What is the difference between a main circuit breaker and a miniature circuit breaker?

A main circuit breaker sits at the origin of an installation and isolates the entire panel. A miniature circuit breaker protects an individual branch circuit. The HUM18‑63N is designed for branch protection with 6kA breaking capacity and KEMA certification for standard residential and commercial final circuits.

Is a miniature circuit breaker good?

Yes. A quality MCB that complies with IEC 60898-1 provides dependable overload and short-circuit protection for many years. The HUM18‑63N is KEMA certified, backed by 20,000-cycle mechanical life, and supports top-in bottom-out wiring — a practical choice for standard distribution applications.