DC MCB | Miniature Circuit Breakers for DC Systems

DC CIRCUIT BREAKER MANUFACTURER

Typically used to protect photovoltaic power generation systems that work on DC currents, SUNTREE line of DC circuit breakers are cost-effective and
high-quality solutions for your brand.

Our qualified team of experts, backed by 16 years of industry experience, understands what the market needs, and manufactures modular circuit
breakers based on your specifications. Expect fast and efficient production with our certified facility that houses many automated production lines,
churning out 200,000+ pieces annually. Place your bulk order today and take advantage of our amazing wholesale prices that are better than the competition.

OUR PRODUCT OFFERINGS

DC Circuit Breaker 550-1000V

DC Circuit Breaker 1000-1500V

DC Circuit Breaker 24-550V

DC CIRCUIT BREAKER TESTING CENTER

SUNTREE has professional testing equipment to ensure the reliability of the products

Miniature circuit breaker electrical life

Test the electrical service life of miniature circuit breakers, requiring all < 125A products to reach 2000 times Testing standard: According to the order quantity, it is tested according to the QAL class I 0.65 Test products: circuit breaker

Molded case circuit breaker mechanical life

Test the mechanical life of all molded case circuit breakers, requiring ≤250A/10000 times 400/630A 4000 times 800A 1000 timesTesting standard: According to the order quantity, it is tested according to the QAL class I 0.65

High and low temperature test

Test the extreme operating environment of the product, requiring the product to operate normally at an ambient temperature of -20°C~70°CTesting standard: According to the order quantity, it is tested according to the QAL class I 0.65 Test products: DC circuit breakers, DC surge protectors, DC fuses and other full range of products

Glow wire flame test bench

Test plastic parts products, such as PA66, PA46, PBT, DMC, etc., the flame retardant materials for 960 ℃ 30 seconds burn test, requiring that when the plastic parts are separated from the product, the product flame to be extinguished within 30, and no burning materials fall.Testing standard:According to the order quantity, it is tested according to the QAL class I 0.65

BRINGING YOUR BRAND TO THE NEXT LEVEL

Working with our team not only increases your profit but also creates an indelible mark in your market.

Small MOQ

Our low order quantity requirements help you order the exact amounts that your brand needs.

In-House Manufacturing

Improved quality and coordination through effective in-house manufacturing standards, resulting in exceptional circuit breakers.

Wholesale Discounts

Purchasing DC circuit breakers wholesale reduces production costs, giving your budget more freedom to move.

Timely Response

Fast and comprehensive response from our support team addresses your concerns within 12 hours.

Innovative Products

Drive for innovation pushes our team to create new and fresh DC circuit breakers for your market.

16 Years of Expertise

With 16 years of exposure in the industry, our team manufactures high-quality and fully-functioning DC circuit breakers.

Frequently Asked Questions

Do the terminals support dual wiring (double in/out)? What is the max thickness of the copper busbar supported?

Yes, our DC MCBs feature reinforced box-type terminals supporting dual wiring. The standard port supports up to 10mm² cables. If using copper busbars, the max supported thickness is 2mm-3mm. The size of cables for wiring terminals varies by product and corresponding standards. Please refer to the instruction manual and product catalog for details.

What wiring options are available?

Suntree DC MCB adopts standard 35mm DIN rail mounting, suitable for standard distribution boxes. Products are available in multiple pole configurations including 1P, 2P, 3P, and 4P. The terminal protection rating is IP20, while the overall enclosure rating is IP40. Installation features non-polarity wiring requirements, with optional electrical accessories including auxiliary contacts and shunt trips.

What are the phase sequence requirements for installation?

Suntree DC breakers feature a non-polarized design, requiring no distinction between positive and negative terminals during installation – wiring can be done arbitrarily. This greatly simplifies installation in PV systems and energy storage systems, eliminating the risk of equipment failure due to reverse polarity connection.

What are the application scenarios for multi-pole breakers in PV systems?

Suntree 3P/4P 1500VDC breakers are mainly used in large-scale PV power plants, energy storage systems, and DC combiner boxes. 3P models are suitable for three-phase DC systems or applications requiring three independent protection circuits; 4P models are commonly used for main output protection in 1500V PV combiner boxes, capable of simultaneously disconnecting positive/negative terminals and grounding circuits. The 1500VDC system is currently the mainstream configuration for large-scale ground-mounted power plants, effectively reducing line losses and system costs.