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High-current DC circuit breakers
ZJBeny
Enclosed two-pole DC circuit breakers
Compare ZJBeny enclosed two-pole DC breakers by current rating, and check they suit your system voltage, cable and fault conditions.
ZJBeny DC circuit breakers and enclosures for solar, battery, and off-grid protection
Choose by requirement
Choose the breaker from the circuit details
The breaker has to protect the cable and suit the system voltage, the source, the mounting and how you isolate the circuit.
ZJBeny DC breakers
Customer stories
Five-star support, from planning to after-sales
A rotating five-star selection from around 150 Google reviews for Solar 4 RVs equipment, advice and ongoing support.
5.0 out of 5 · Selected five-star Google reviews
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Absolutely stellar service from Cameron at Solar 4 RVs. Initially had him quote up a solar system for my campervan back in June 2024 and then when I was ready to purchase in November 2024 he was able to give me the best prices for every product and so I went ahead with the order.
Also gave me some tips to commission the system once I installed the products. Stoked on the Victron gear. Thanks guys!
Purchased a 12v/15a battery charger in 2023. Had issues with it today (2025). Called their info number and explained. Instantly agreed to accept it as a warranty issue and dispatched a replacement without any problems. Extremely quick service and item dispatched express courier that same day. Outstanding customer service. Thank you.
Purchased a literal boat load of electronics from them for our vessel. It all works great and they did an amazing job setting up the panel. We have had the gear a few years now and still reach out when we need help. Great customer service!
Not sure which ZJBeny product suits your system? Send our technical team the model you are considering and your system details, and we will check the surrounding parts.
Ask our technical teamFrom the Solar 4 RVs library
ZJBeny breaker selection guides
Guides on matching high-current DC protection to the cable, source, system voltage and enclosure.
Should I Use a DC Circuit Breaker or Fuse?
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How to Read Fuse Ratings | Understanding Fuse Specifications
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Why ‘Continuous’ Ratings Can Prevent Fires and Equipment Failures
In power systems, ignoring continuous ratings isn't just a minor oversight—it's risking safety, efficiency, and longevity. Installers and buyers often focus on impressive peak...
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Ultimate DC Cable Sizing / System Wiring Calculator for RVs/Caravans
This interactive calculator will help you understand your RV's full power system, including the inverter, battery charger, DC-DC Charger, battery, solar panels, MPPT, and...
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Electrical wiring of systems with batteries, inverters and chargers
Topics include current, selecting cable, cable resistance, voltage drop, battery bank wiring, fuses and circuit breakers, fuses, shunts, earth wiring, solar panels, voltage sensing...
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Which Cable Type? Automotive, Marine, Solar & Welding/Battery
Our guide covers the basics of the differences between automotive, marine, solar, and welding/battery cables, providing you with the knowledge to make informed choices...
Read guideAbout this range
ZJBeny DC Circuit Breakers & Enclosures for Reliable System Protection
Protect your off-grid, caravan, RV, marine, and 4WD electrical systems with ZJBeny DC circuit breakers and enclosures. These high-current, 2-pole breakers are purpose-built to isolate and safeguard DC circuits in solar arrays, battery banks, and inverter setups. Whether you are installing a new lithium battery system, upgrading your existing DC protection, or building a custom power distribution board, ZJBeny breakers provide a robust, resettable solution that helps prevent overloads and short circuits without the need for replacement fuses.
Each breaker in this range is supplied with a matching enclosure, simplifying installation and ensuring compliance with Australian wiring standards. The 2-pole design allows simultaneous disconnection of both positive and negative conductors, which is essential for ungrounded or floating DC systems commonly found in mobile and remote power applications.
Why Choose ZJBeny DC Breakers?
- High interrupting capacity: Designed to handle the fault currents typical of lithium battery banks and large solar arrays.
- 2-pole isolation: Breaks both positive and negative lines for complete circuit isolation, enhancing safety during maintenance.
- Enclosed design: Each breaker comes with a durable, IP-rated enclosure that protects connections from dust, moisture, and accidental contact.
- Resettable protection: Unlike fuses, these breakers can be reset after a trip, reducing downtime and the need to carry spares.
- Versatile mounting: Suitable for surface mounting in battery compartments, electrical cabinets, or custom power boards.
Available Amperage Ratings
We stock ZJBeny 2-pole DC breakers in three popular sizes to match different system requirements:
- 125A: Ideal for mid-sized battery banks, DC-DC charger inputs, and smaller inverter DC circuits.
- 160A: Suited to larger single-battery systems or parallel battery setups with moderate surge demands.
- 250A: Designed for high-power inverters, large lithium battery banks, and main battery isolator applications.
Selecting the correct amperage is critical. A breaker rated too low may nuisance trip, while one rated too high may not provide adequate protection. Our team can help you match the breaker to your expected continuous load and peak surge current.
Typical Applications
ZJBeny DC breakers are used across a wide range of mobile and off-grid power systems:
- Caravan & RV solar setups: Main battery isolation and solar array disconnect.
- 4WD dual battery systems: Protect auxiliary circuits and DC-DC charger wiring.
- Marine & boat electrical panels: DC main breakers for house and starting banks.
- Truck & bus conversions: High-current protection for 24V DC systems.
- Off-grid tiny homes: Battery bank isolation and inverter DC input protection.
- Commercial & industrial DC systems: Reliable disconnection for solar combiner boxes and DC distribution.
Installation Tips & Compatibility
For best results, mount the enclosed breaker in a dry, ventilated location close to the battery bank or power source. Use appropriately sized cable lugs and ensure all connections are torqued to the manufacturer's specifications. While these breakers are robust, they should be paired with correctly sized battery cable to minimise voltage drop and heat buildup.
If you are integrating a ZJBeny breaker into a larger system, consider complementing it with a battery monitor to track state of charge and current flow, or a fuse holder for additional branch circuit protection. For solar-specific applications, an MPPT solar charge controller will maximise panel output while the breaker provides a safe disconnect point.
Frequently Asked Questions
What is the difference between a 1-pole and 2-pole DC breaker?
A 1-pole breaker only interrupts one conductor (usually positive), while a 2-pole breaker simultaneously disconnects both positive and negative. In ungrounded DC systems—common in RVs, boats, and off-grid solar—a 2-pole breaker is recommended for complete isolation and enhanced safety.
Can I use a ZJBeny breaker as a battery isolator?
Yes, a suitably rated ZJBeny 2-pole breaker can function as a manual battery isolator, allowing you to disconnect the battery bank for storage, maintenance, or emergency shutdown. However, for frequent switching or remote operation, a dedicated battery isolator switch may be more convenient.
How do I choose the right amperage for my system?
Select a breaker rated for at least 125% of your maximum continuous current. For example, if your inverter draws 200A at full load, a 250A breaker is appropriate. Always check the breaker's trip curve and ensure it can handle short-duration surge currents without nuisance tripping.
Are these breakers suitable for lithium battery systems?
Yes, ZJBeny DC breakers are compatible with lithium iron phosphate (LiFePO4) battery banks. Their high interrupting capacity makes them suitable for the low internal resistance and high fault current potential of lithium batteries. Always verify the breaker's voltage and current ratings against your specific battery specifications.
Need help selecting the right DC breaker for your setup? Our Australian-based support team has over a decade of experience in mobile and off-grid power systems. Contact us for personalised advice, or browse our buyer's guides for detailed installation and sizing information.