ZJ Beny BDM Series PV DC Moulded Case Circuit Breaker, MCCB, 125/250A

The ZJ Beny BDM Series 125A/250A DC Moulded Case Circuit Breaker (MCCB) is engineered for heavy-duty solar PV applications. It provides robust overload and short-circuit protection in DC power systems such as large solar combiner boxes, inverters, and DC distribution cabinets.

Rated for up to 500V DC and currents up to 250A, the BDM breaker is ideal for multi-string PV arrays and battery storage installations. It meets international safety standards (IEC 60947-2 and AS/NZS 60947.2) and offers high breaking capacity to safely interrupt large fault currents typical in solar or battery systems.

ZJ Beny’s BDM breakers feature a lockable, transparent safety cover, allowing clear status checks while preventing accidental operation. With an IP65 UV-resistant enclosure and wide temperature rating (-40°C to +85°C), these MCCBs are built to withstand harsh outdoor environments.

The design includes a no-polarity option (can be used on either positive or negative line) for flexible wiring. Overall, the BDM series combines rigorous IEC certification, excellent short-circuit performance, and PV-specific construction for reliable system protection.

ZJ Beny BDM Series – MCCB

The BDM series DC MCCBs are 2-pole breakers specifically designed for solar and battery DC applications. They come in three current ratings (125A and 250A) and are all rated up to 500VDC. Key technical highlights include: thermal-magnetic trip elements for both overload and short-circuit protection, and a high short-circuit interrupt capacity to handle faults without damage. Each breaker is housed in a robust IP65 weatherproof, complete with a lockable transparent cover for added safety.

This enclosure allows the breaker to be installed indoors or outdoors (e.g. on a rooftop combiner box) without additional weatherproofing. The BDM series is tested for extreme conditions (-40°C to +85°C) and typically carries SAA/TUV certification marks, reflecting compliance with IEC/AS standards for industrial circuit breakers.

Key Features

• High DC Voltage & Current: Available in 2-pole 125A and 250A versions, each breaker is rated up to 500V DC. Ideal for multi-string PV arrays, battery systems, and large solar installations.
• Thermal-Magnetic Protection: Provides dependable overload and short-circuit protection in DC circuits. Rapid magnetic trip handles surges and faults.
• IEC Certified: Conforms to IEC 60947-2 industrial circuit breaker standards, ensuring safe operation in solar PV environments. Often supplied with TUV/SAA certification.
• High Short-Circuit Breaking Capacity: Engineered for high fault currents common in PV systems, the MCCB can interrupt large DC arcs without damage.
• Durable IP65 Enclosure: UV-resistant, weatherproof housing suitable for outdoor installations. Protects internal components from dust, rain, and sun.
• Lockable, Transparent Cover: Clear flip-up lid allows visual status checks and can be padlocked for maintenance safety.
• Wide Operating Range: Rated for extreme ambient conditions (-40°C to +85°C), matching Australia’s varied climate from deserts to coastal areas.
• No Polarity Design: The 2-pole breaker can be wired on positive or negative DC lines interchangeably (no dedicated polarity), and works in grounded or ungrounded systems.
• Warranty & Quality: Comes with a manufacturer warranty (typically 5 years), reflecting the unit’s long-term reliability in PV systems. High mechanical and electrical endurance ensure years of operation.

Main Benefits

• Enhanced System Safety: The ZJ Beny MCCB prevents overloads and faults in PV combiner boxes, protecting solar panels and inverters. Its high DC breaking capacity and thermal trip help avoid fires and equipment damage.
• Solar-Ready Design: Specifically built for photovoltaic use (up to 500VDC). Ideal for string combiner boxes, rooftop solar arrays, off-grid/battery installations, and even EV charging stations.. Incorporating this MCCB ensures your DC protection meets solar industry norms.
• Reliable, Certified Protection: Compliance with IEC 60947-2 and AS/NZS 60947.2 standards gives you confidence in performance. This simplifies system approvals, as the breaker meets global safety codes for renewable energy.
• Outdoor Durability: The UV-resistant IP65 enclosure and wide temperature rating mean the breaker can sit in harsh Australian environments with minimal maintenance. You get consistent protection year after year, reducing downtime in remote or exposed installations.
• Long-Term Value: With robust construction and high cycle life, these MCCBs deliver a low total cost of ownership. They minimize replacement and service needs. Combined with Solar Rains’ support and warranty, you get lasting value for your solar projects.
• Easy Integration: Lockable handle and modular design make servicing straightforward. The “no polarity” feature simplifies wiring. Being compatible with standard DIN rail or panel mounts, the BDM series fits neatly into existing DC distribution setups.

Operation Performance

The ZJ Beny BDM Series is engineered to deliver stable protection in high-current DC circuits. It combines both thermal and magnetic trip mechanisms to ensure rapid response under fault conditions:

• Thermal Trip: Responds to overload conditions by slowly disconnecting the circuit when sustained high current is detected.
• Magnetic Trip: Activates instantaneously to interrupt short-circuit currents, preventing equipment damage or fire risk.

The breakers are designed for DC-specific use with a 2-pole configuration and non-polarity wiring – allowing users to connect either positive or negative strings interchangeably. This simplifies installation while preserving electrical integrity.

Additionally, a transparent flip-up safety cover provides visual inspection of the ON/OFF state and can be padlocked during maintenance, ensuring operational clarity and technician safety.

Typical use cases:

• DC combiner boxes (multi-string PV arrays)
• Solar battery banks (Li-ion or lead-acid)
• Off-grid and hybrid inverter protection
• EV DC charger cabinets

Environmental & Durability Ratings

Built for long-term performance in harsh outdoor environments, the BDM breaker’s construction exceeds standard enclosure requirements:

• Enclosure Rating: IP65 – Fully sealed against dust and resistant to low-pressure water jets from any direction, ideal for outdoor rooftop installation.
• Material: UV-resistant thermoplastic casing with flame-retardant properties, ensuring stability in prolonged sun exposure or elevated temperatures.
• Operating Temperature: -40°C to +85°C – Matches the extreme conditions across Australia, from inland deserts to coastal humidity.
• Storage Temperature: Same as operating range – ensures safe stockpiling before deployment.

The MCCB is compliant with IEC 60947-2 and AS/NZS 60947.2, meaning it is tested for durability, insulation integrity, and fault tolerance across real-world conditions. Its mechanical endurance and high short-circuit breaking capacity make it ideal for remote solar setups where reliability is non-negotiable.

This combination of rugged enclosure, advanced protection mechanisms, and long-term resilience makes the ZJ Beny BDM Series a top-tier choice for engineers and solar contractors seeking dependable DC overcurrent protection.

Caveat: The product description and datasheet on this page may not be the most updated version. Please refer to the user manual coming with products if there are conflicts.

ZJ Beny

Founded in 2011, ZJ Beny (Beny New Energy) is a global leader in protective components for the renewable energy industry. The company specializes in DC-rated circuit breakers, fuses, and EV charging products with over 30 years of power electronics expertise.

ZJ Beny’s products, including the BDM series, are designed to deliver high reliability and long service life. Engineers and procurement managers know ZJ Beny for quality-tested, IEC-certified equipment that serves homeowners, commercial sites, and utility-scale solar projects worldwide.