250V DC Miniature Circuit Breaker

Protect your DC circuits with the CDADA DAB7-63 250V DC Miniature Circuit Breaker (MCB) – rated up to 250V DC, engineered by Shanghai DADA Electric CO., LTD, a reliable factory in China, for reliable overload and short-circuit protection in modern solar photovoltaic (PV), telecommunications, battery storage, and industrial DC systems.

Unlike standard AC breakers, the DAB7-63 is specifically designed for DC applications, where arc extinction is more challenging due to constant voltage polarity. With a high breaking capacity of 6,000A at DC 250V, it rapidly interrupts fault currents to prevent damage from reverse current, inverter feedback, or string faults—making it an essential safety component in residential and commercial solar installations.

Available in 13 current ratings (1A–63A) and 1P configuration for 250V DC, it also scales to 2P (500V), 3P (750V), and 4P (1000V) for higher-voltage PV arrays. The breaker features dual wiring options (cable or busbar), clear contact position indication, and fast-make/fast-break mechanism for enhanced arc suppression. Fully compliant with IEC 60947-2, IEC 60947-8, CCC, and EU RoHS, it ensures global safety and environmental standards.

Key Specifications

Wiring Diagram

Miniature DC circuit breaker outline and installation dimensions

Why Choose CDADA DC MCB 250V?

★ Purpose-Built for DC Systems

Optimized arc chute design ensures safe interruption of DC fault currents—unlike repurposed AC breakers.

★ Solar PV Ready

Critical for protecting PV modules from reverse current and inverter failure feedback—enhances system reliability.

★ High Breaking Capacity

6kA at 250V DC meets requirements for most residential and small commercial solar installations.

★ Global Certifications

IEC + CCC + RoHS = trusted performance in Asia, Europe, Africa, and Latin America.

★ User-Safe Design

Clear contact position window prevents misoperation; dual wiring simplifies panel integration.

★ Wide Operating Range

Functions reliably from –35°C (cold climates) to +70°C (hot rooftops or enclosures).

Why choose CDADA?

★ We are manufacturer for over 42 years. Our company built in 1983, develop very fast during the past years. With over 1000 items, we have been designing and making our own circuit breaker centered around off-the-shelf OEM circuit breaker and seals. We create new concept to make diversified male circuit breaker to support customers’ needs.

★ With over 42 years of experience, we have in-house design and production equipment for quick, quality turn-around.

★ We have a very quick feedback team. Inquiries replied within 1 working day, 3D replied within 1 working day.

★ Packing

Most of our customers provide us with product or packaging specifications right on their design prints. We would be happy to work with you to fulfill your requirements.

★ World famous electricity Power Gen exhibition

Our exhibition covers the world, Dubai, Brazil, Russia, Hanover, Egypt, Austria, Iran, Mexico and other professional power exhibitions

Typical Applications

Solar Photovoltaic Systems: String protection in combiner boxes

Battery Energy Storage: DC side overcurrent protection

Telecom Power Cabinets: –48V or +24V DC distribution

Electric Vehicle Charging Stations: Auxiliary DC circuits

Industrial Control Panels: PLC, sensor, and actuator DC power feeds

FAQ

Q1: Can I use an AC MCB for DC 250V circuits?

A1: No. AC breakers rely on zero-crossing to extinguish arcs—DC has no zero-crossing, so arcs persist, causing melting, fire, or failure to trip. Always use a DC-rated MCB like CDADA DAB7-63.

Q2: Is polarity important?

A2: Yes! The DAB7-63 250V DC Miniature Circuit Breaker has defined input (power +/–) and output (L+/L–) terminals. Reversing polarity reduces arc quenching efficiency and may void safety certification.

Q3: What’s the difference between 1P, 2P, and 4P DC MCBs?

A3:

● 1P: Protects one conductor at 250V DC (e.g., positive line in grounded PV system)

● 2P: Breaks both + and – at 500V DC (floating systems)

● 4P: For 1000V DC strings (large commercial PV plants)

→ Always match pole count to your system voltage and grounding scheme.

Q4: Can it be used for frequent switching?

A4: No—it’s designed for infrequent manual operation (e.g., maintenance). For daily switching, use a DC contactor or load switch.

Q5: Why choose CDADA over other DC MCB brands?

A5: CDADA offers:

● True DC arc interruption design (not AC-adapted)

● Full IEC + CCC certification

● Clear visual status indicator

● Wide current range (1A–63A) for precise sizing

● Competitive pricing with technical documentation in English