HUM18-80 – Miniature Breaker 80 Amp,1P to 4P,Type B/C/D

HUM18-80 Miniature Breaker – Advanced Protection with Expandability

The HUM18-80 from HUYU Electric is a high-performance miniature breaker designed for terminal distribution circuits, offering an 80A rating that fills the gap between 63A final circuit devices and larger 125A main breakers. Operating at AC 50/60Hz up to 400V, and featuring 6kA Icu/Ics (symmetrical breaking capacity), it ensures overload and short-circuit protection per IEC 60898-1. The breaker is also certified with CB, CE, CCC, and RoHS, guaranteeing compliance with international standards.

What sets this sophisticated miniature circuit breaker apart is its intrinsic ability to offer accessory expandability. With snap-on additions like alarm contacts for trip indications, shunt release for remote disconnection, under-voltage trip units to secure equipment against brownouts, and over-voltage trip units to guard against surges, the HUM18-80 transitions from being merely a protective device to an integral component of building management and industrial automation systems. It features user-friendly installation with 25mm² terminal capacity, 2.0 N·m torque, and supports wiring from the top or bottom across configurations (1P, 2P, 3P, 4P) and trip curves (B, C, D). HUYU Electric delivers the 80A miniature breaker at competitive OEM/ODM factory-direct pricing, enabling private labeling and full documentation to foster an alternative solution to global brands such as Schneider, ABB, Chint, GE, Hager, Eaton, Siemens, Legrand, and Havells.

Pole Configurations & Trip Curves – Versatile Solutions for All Applications

All pole configurations maintain a robust 6,000A Icu/Ics, providing maximum operational reliability even after clearing a fault. Type B deals with resistive loads, such as heating systems or lighting, while Type C is designed for inductive circuits like HVAC systems or pump motors. For high-inrush currents from motors or transformers, Type D is perfect. Regardless of pole configurations, the rated current is fixed at 80A across all types for consistent performance.

Accessory Expandability – Integrated Protection

The HUM18-80 offers enhanced versatility with four attachable accessories. These can be added during installation or retrofitted later without requiring tools. Features include:

• Alarm Contact: Sends a trip signal to a remote monitoring system upon circuit breaker trip.
• Shunt Release: Facilitates remote disconnection from a PLC or external switch.
• Under-Voltage Trip Unit: Protects against low voltage conditions, safeguarding equipment.
• Over-Voltage Trip Unit: Disconnects the circuit during sustained high voltage to prevent equipment damage.

These enhancements enable the HUM18-80 to function seamlessly within automated power distribution systems while ensuring long-term protection.

Technical Specifications

OEM/ODM Miniature Breaker Solutions – Industry Alternatives

Buyer’s Guide

Choose the Right 80A Miniature Breaker – A Step-By-Step Guide

Use these guidelines to configure the perfect HUM18-80 circuit breaker for your requirements, based on rating, curve types, and accessories.

1. Confirm Circuit Rating:

Evaluate whether the 80A rating is suitable for your application, ensuring compatibility with your equipment and overall power distribution requirements.

2. Select the Right Trip Curve:

Match the trip curve with specific equipment needs:
– Type B: For resistive loads such as heaters or lights.
– Type C: Best suited for medium inductive loads.
– Type D: Ideal for motor-driven equipment with high inrush currents.

3. Choose Pole Options:

Select 1P, 2P, 3P, or 4P configurations based on your system’s phase requirements, all while keeping the panel alignment consistent thanks to the standardized layout.

4. Determine Accessory Needs:

Enhance system control using add-ons like alarm contacts, shunt releases, and voltage trip units. These modular additions are easy to install without specialized tools and enhance automation and monitoring capabilities.

Frequently Asked Questions

What is a miniature breaker?

A miniature breaker, also known as a miniature circuit breaker (MCB), is a compact overcurrent protection device that automatically disconnects an electrical circuit during overload or short circuit. It mounts on a standard 35mm DIN rail inside a distribution board or control panel, and can be reset by simply switching it back on — unlike a fuse, which must be replaced after it operates.

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

The term “circuit breaker” covers a broad category that includes miniature circuit breakers (MCBs), moulded case circuit breakers (MCCBs), air circuit breakers (ACBs), and others. A miniature circuit breaker is specifically the compact, DIN-rail-mounted type used in final distribution panels — typically rated up to 125A. The HUM18-80 is a miniature circuit breaker rated at 80A with 6kA breaking capacity, suitable for terminal distribution and sub-main applications.

Why use a miniature circuit breaker?

A miniature circuit breaker provides three essential functions in one device: overload protection (too much current over time), short-circuit protection (instantaneous response to a fault), and a means of isolation for maintenance. It is reusable — once tripped, flip the switch to restore power. This makes it more convenient and cost-effective over its service life than fuse-based protection, particularly in installations where circuits are frequently switched or where nuisance tripping may occur from temporary overloads.

Can a miniature circuit breaker be reset?

Yes. Unlike a fuse, which must be physically replaced after it blows, a miniature circuit breaker can be reset by switching the operating handle back to the ON position. However, it is important to identify and resolve the cause of the trip first — whether it was a temporary overload or a persistent short circuit — before resetting. The HUM18-80 is rated for 10,000 electrical switching cycles and 20,000 mechanical cycles, making it suitable for installations where periodic resetting is expected over a long service life.