HUB9NEZ-80 DC Circuit Breaker,16A-80A,UL 489

HUB9NEZ-80 DC Circuit Breaker – NP, UL rating of 1200V DC

The HUB9NEZ-80 series DC Circuit Breaker from HUYU Electric’s NE.NEW.ENERGY’SERIES 2 offers a practical benefit in regard to DC protection because it doesn’t require a specific polarity. It has a non-polarity design and can be installed without having to worry about which terminal is “+”/”-.” This will simplify the installation of PV combiner boxes and battery cabinets and reduce the number of wiring errors on crowded DIN rails. The HUB9NEZ-80 is rated for use on DC networks with current ratings from 16A to 80A and can be used with voltages of up to 1200V DC. This DC CB for solar and storage applications has been certified by both UL 489 and TUV and will help manufacturers enter the PV markets in North America, Europe, and globally.

The HUB9NEZ-80 is available with thermal-magnetic trip curves in B and C styles, so that it can be used on DC applications with resistive loads and capacitive loads and can withstand high inrush levels. The outgoing/incoming configuration offers customers an Icu of 10kA, which is true across the 250V single pole up to the 1200V 4 pole strings. HUYU Electric provides factory OEM/ODM, UL 489 documentation, and private label manufacturing on the HUB9NEZ-80 for project buyers and for panel builders who are looking for a DC CB solution for battery storage or solar applications.

The Technical Data Table

The voltage ratings for the HUB9NEZ-80 have TUV and UL certifications. The TUV certification is for every voltage ladder including 250V (1P) and 1200V (4P), and the UL489 certification is for 1000V DC in the 4-pole configuration. If you want a solar DC breaker to protect a 1000V or 1200V PV string, the 4-pole configuration provides approved performance with a 10kA breaking capacity — with a good margin for most string-combiner applications. With a maximum rating of 80A, the DC circuit breaker can be used as a main DC disconnect in smaller PV systems or as feeder protection in larger installations.

Non-Polarity Design & Potential to Provide Thermal-Magnetic Protection

The HUB9NEZ-80 has been designed so that there’s no possibility of reverse wiring. Using a standard polarized circuit breaker locked into position by its positive or negative contacts, if they are connected wrong, it’s going to be difficult to put an arc out of the device so it may cause the breaker to trip out if there is a fault. The HUB9NEZ-80 eliminates that limitation since it can interrupt a fault regardless of the direction of the current flow. This is especially important for battery energy storage systems that will have current flowing in both directions depending on whether they are charging or discharging.

The B and C trip curves will also provide coverage for standard DC applications. B curves will be for applications with resistive loads having low inrush currents, while C curves will be applicable to capacity loads and DC-DC converters where there is a moderate amount of inrush current. Both trip curves are designed specifically for DC applications as opposed to the trip curves being adapted for DC from AC trip curves.

OEM/ODM Supplier & UL 489 Certified DC Circuit Breakers for North American and Global PV Markets

Buyer’s Guide

How to Select a UL 489 DC Circuit Breaker for Solar and Storage

Key criteria for choosing the HUB9NEZ-80 in PV and energy storage applications.

1. Why UL 489 Certification Matters

UL 489 is the North American standard for molded-case circuit breakers, required for PV and energy storage installations in the US, Canada, and other markets referencing UL codes. A DC circuit breaker with UL 489 listing has passed rigorous endurance, temperature, and fault-interruption tests. The HUB9NEZ-80’s UL 489 certification covers its full current and voltage range, providing the documentation needed for AHJ approval.

2. Non-Polarity: Practical Benefits in the Field

A conventional polarized DC circuit breaker for solar requires the source to be connected to a specific marked terminal — reversing it risks breaker failure. The HUB9NEZ-80’s non-polarity design removes this constraint entirely, making installation easier and more reliable under all conditions, including battery storage systems where current flows bidirectionally.

3. Voltage and Pole Selection

Select the pole count based on the maximum system voltage: 1P for single strings up to 300V DC, 2P for 600V, 3P for 900V, and 4P for 1000V or 1200V DC strings. The 4-pole configuration series-connects the contacts to handle the full 1200V DC rating. For utility-scale PV projects, the 4P solar DC breaker is the standard choice.

4. B or C Curve?

Select the B curve (magnetic trip at 4× In) for resistive DC loads, and the C curve (8× In) for capacitive loads with higher inrush currents. The C curve offers a balanced solution, ensuring inrush tolerance alongside effective fault protection, making it ideal for battery storage applications.

Frequently Asked Questions

What is a DC circuit breaker?

A DC circuit breaker is an overcurrent protection device specifically designed and tested to interrupt direct current faults. Unlike AC breakers that benefit from the current’s natural zero-crossing to extinguish the arc, a DC circuit breaker must force the arc to collapse using magnetic blowout coils, arc chutes, and carefully designed contact separation. The HUB9NEZ-80 DC circuit breaker is a genuine DC-rated device with UL 489 and TUV certification confirming its ability to safely break DC currents up to 10kA at voltages up to 1200V DC.

Is there a DC circuit breaker?

Yes, DC circuit breakers exist and are specifically manufactured for DC applications. They are not simply AC breakers relabeled — a genuine DC circuit breaker incorporates a different internal arc extinguishing system using permanent magnets or magnetic blowout coils to stretch and cool the DC arc. The HUB9NEZ-80 is one such device, with UL 489 listing that verifies its DC-rated performance through independent testing. For photovoltaic and battery storage applications, using a certified DC circuit breaker for solar is both a code requirement and a safety necessity.

Is there a difference between AC and DC circuit breakers?

Yes, there are significant differences. An AC circuit breaker relies on the alternating current’s zero-crossing — occurring 100 or 120 times per second — to naturally extinguish the arc when contacts open. A DC circuit breaker faces continuous current with no zero-crossing, so it uses magnetic blowout technology to force the arc into a segmented arc chute, stretching and cooling it until it collapses. DC breakers also typically have larger contact gaps and different contact materials to handle the thermal stress of sustained DC arcs. The HUB9NEZ-80 demonstrates these differences with its DC-specific 10kA Icu rating, non-polarity design, and UL 489 DC certification.

Can you use an AC circuit breaker on a DC circuit?

No, using an AC circuit breaker on a DC circuit is unsafe and violates electrical codes. An AC breaker’s arc extinguishing mechanism is not designed to handle the sustained arc that DC current produces — without zero-crossing assistance, the arc may not extinguish, leading to contact welding, insulation failure, or fire. The voltage and current ratings on AC breakers are valid only for AC, and applying them to DC dramatically reduces their effective breaking capacity. Always use a certified DC circuit breaker like the HUB9NEZ-80, which is independently tested and UL 489 listed for DC interruption at its rated voltage and current.