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Your Premier Dc Circuit Breaker Manufacturer

 

ZJBENY is a trusted manufacturer of protective components for photovoltaic systems across the globe. Through our focus on solar DC protection design, production, and marketing, we can bring brand-building PV protection solutions.
In recent years, ZJBENY has attentively invested resources in research on EV-related products, successively manufacturing other types of products, thus reaping wide market popularity across the world.

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Why Choose Us?

Rich Experience

Our experience of working in the electrical industry for more than 30 years allows us to create solar DC components that comply with the latest DC standards. With the inheritance of 30+ years of experience in the research and production of DC protection products, we are continuously dedicated to the EV charging field.

Broad Market

ZJBENY has attentively invested resources in research on EV-related products, successively manufacturing other types of products, thus reaping wide market popularity across the world.

Wide Product Range

ZJBENY offers a full range of solar PV protection products and EV chargers for different solar PV, battery energy storage, and EV charging system. Our Main Product Lines: EV Charger, Rapid Shutdown Device, Microinverter, PV Combiner Box, DC Isolator Switch, DC Circuit Breaker, DC Fuse Holder, DC Contactor, AC Components, etc.

Leading Service

We independently complete the R&D, production, marketing, sales, and technical support processes. We satisfy your needs with our long warranty, technical support, and other value-added services.

 

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What is Dc Circuit Breaker?

A circuit breaker is an overcurrent protection device (OCPD) designed to protect electrical devices and individuals from overcurrent conditions. A DC circuit breaker is used to protect electrical devices that operate with direct current (DC) and contains additional arc-extinguishing measures. DC circuit breakers are a relatively new technology and used in EV charging stations, photovoltaics, and battery storage systems, as well as industrial DC distribution networks.

 
Advantages of Dc Circuit Breaker
1

Improved Arc Extinguishing: DC circuit breakers are designed to handle and extinguish DC arcs more effectively. DC arcs are generally more difficult to extinguish than AC arcs because DC systems do not have a zero crossing point. DC circuit breakers have a special arc extinguishing mechanism: B. Magnetic extinguishing coil to quickly extinguish the arc and prevent re-ignition.

2

Low Voltage Drop: DC circuit breakers typically have a lower voltage drop across contacts compared to AC circuit breakers. This is beneficial in applications where voltage stability is critical, as it minimizes power loss and allows for more precise control of the DC system and DC circuit breaker connections.

3

Reduced Response Time: DC circuit breakers often have a faster response time compared to AC circuit breakers. Because DC systems have no zero-crossing points, faults can be detected and cleared more quickly, providing faster protection against short circuits and other abnormal conditions.

4

Compact Size: DC circuit breakers are more compact and lighter than AC circuit breakers with the same rated current. This is because DC systems generally have smaller dimensions and fewer components to operate.

5

Increased Selectivity: A DC circuit breaker can improve selectivity. In other words, in the event of a fault, only the faulty section of the circuit is isolated, leaving the rest of the circuit unaffected. This selective operation minimizes downtime and interference in connected DC systems.

6

Compatibility with Dc Power Supplies and Loads: DC circuit breakers are specifically designed to handle the characteristics of DC power sources and loads. It can interrupt and control DC current without the limitations of AC circuit breakers optimized for AC current.

7

Security Aspects: DC circuit breakers can provide advanced safety features such as: B. Arc fault detection, ground fault protection, overload protection. These features help ensure the safe operation and protection of DC power systems and their connected devices.

Types of DC Circuit Breaker

Thermal-Magnetic Circuit Breakers

These breakers combine a thermal element, which reacts to heat generated by overcurrent, and a magnetic element, which responds to high current levels, to provide protection in a wide range of situations.

Electronic Circuit Breakers

Utilizing electronic components, these breakers can offer faster response times and adjustable settings for overcurrent protection.

Hybrid Circuit Breakers

Combining both mechanical and electronic components, hybrid breakers can provide fast, reliable protection while minimizing the risk of nuisance tripping.

 

Applications of DC Circuit Breaker

  • Circuit breaker boxes

  • DC electric motors

  • Electric circuits that are battery powered

  • Electric vehicles for charging stations

  • Fuse box in gas and electric cars

  • LED lamps (high efficiency)

  • Photovoltaic solar panel installations

  • UPS systems (Uninterruptible Power Supply)

  • Welding machines (electric arc)

DC Mini Circuit Breaker 1200V 50A UL Listed BB1-63

 

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Tips for DC Circuit Breaker

Because the protection mechanisms for AC and DC currents are nearly identical, specific circuit breakers are designed to use both. However, it is critical to double-check that the power supply and circuit breaker are of the same type of current. If you place the wrong circuit breaker, the installation will not be adequately protected and an electrical accident may occur.

Another important factor to consider is the current rating of the cables connecting the DC mini circuit breaker to the protected electrical equipment. Even if you set the DC breaker correctly, undersized cables can overheat, melt their insulation and cause electrical failure.

When an electrical system requires the use of a direct current circuit breaker, it is often recommended to retain the services of expert engineers and technicians to ensure that you can select and install the appropriate smart DC circuit breaker.

Certifications

 

 

We have the UL1741 mark, certification issued by Underwriters Laboratories, the most important for system interconnection tests in the USA. ZJBENY also holds SAA, CB, CE, TUV, ISO, RoHS certifications.

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Contact US

                        If you have any enquiry about quotation or cooperation, please feel free to email us at benyi@zjbeny.com, or use the following enquiry form. Our sales representative will contact you within 24 hours. Thank you for your interest in our products.

                       TEL: +86-577-57177008
                       FAX: +86-577-57177007
                       Address: Changjiang Rd, Wenzhou Daqiao Industry Park, Yueqing, Wenzhou, Zhejiang, China, 325603

 

Frequently Asked Questions

Q: How do you hook up a DC circuit breaker to a solar panel?

A: According to the wiring diagram, 2P DC MCB has two wiring methods, one is the top is connected to the positive and negative poles, another method is the bottom is connected to the positive and negative poles as the marking of '+' and '-'.

Q: Can I use an AC circuit breaker in a DC circuit?

A: The ways in which AC and DC breakers are designed to extinguish the arc are very different and this is why AC and DC breakers are not interchangeable. Only breakers that are labeled as DC rated should be used for DC applications. An AC-rated breaker should never be used in a DC circuit.

Q: What is the difference between a DC fuse and a DC breaker?

A: Compared to identical fuses, circuit breakers have breaking capabilities up to 150 kA higher. They can trip up to 1000 times faster than fuses in an overload situation. Specific fuse types only have current restrictions.

Q: Do DC breakers have polarity?

A: When we install polarized DC breakers in between the battery and the inverter, we consider the battery as the source and set the polarity accordingly. But, when the battery is charging, the direction of the current flow is reversed and the breaker becomes reversely polarized.

Q: What are the disadvantages of DC circuit breakers?

A: The main disadvantages of these types of circuit breakers are the high on-state losses and the capital costs. The commutation path has a series resonance. When interruption is required, current oscillation can occur between the nominal and the commutation path at the natural frequency (1/LC).

Q: What is an example of a DC circuit breaker?

A: Every car has a fuse box with DC circuit breakers. Charging stations for electric vehicles. Uninterruptible Power Supply (UPS) systems, which typically uses batteries. Even if the UPS supplies power for AC devices, it must store energy as DC in the battery bank.

Q: How do I know if my breaker is AC or DC?

A: There are also differences in the number of primary contacts between these two. For DC, there are two mina connections, and for AC, there are three. On the other hand, specific breakers are made so that they can be used in both AC and DC circuits.

Q: Does voltage matter on DC circuit breaker?

A: The voltage rating of a circuit breaker must be equal to or greater than the circuit voltage. The voltage rating of a circuit breaker can be higher than the circuit voltage, but never lower.

Q: Will a 240v circuit breaker work on 12v?

A: Within limits, yes. The breaker is rated for current as well as voltage, but the current limit for DC is less than for AC. This is because when the contacts open a small arc is generated.

Q: How do I choose a DC circuit breaker?

A: When choosing a DC miniature circuit breaker, make sure to check if the voltage and current ratings are the same. The tripping current of a DC MCB must be less than the rated ampere. This is due to the fact that circuit breakers need to reduce power when the current reaches the frequency frame size.

Q: Can I use a DC circuit breaker instead of a fuse?

A: Selecting a fuse or circuit breaker all depends on the application you are using. If you have something that requires high sensitivity you might want to look at fuses, whereas if you have high inrush current you will want to lean towards circuit breakers.

Q: What size DC circuit breaker do I need?

A: Calculating the appropriate fuse or breaker size for a branch circuit is straightforward. For most applications, an overcurrent device should be sized about 125% of the load's rated amperage. This way, your load will be protected from electrical short-circuit.

Q: Why are DC breakers polarized?

A: Polarized DC circuit breakers use a small magnet to direct the arc away from the contacts and up into the arc de-ionization chamber. If the direction of current flow through the unit is reversed, then the magnet directs the arc away from the arc chute and into the mechanism of the unit, thus destroying it.

Q: Should DC fuse be on positive or negative?

A: The fuses are placed in the positive lines from the battery and close to the battery. If a fault occurs on the line between the fuse and the load the fuse blows and current flow stops. A ground fault on the return line is unlikely to cause any problems as there is no significant voltage on it.

Q: What are the advantages of DC circuit breaker?

A: They can powerfully work like hv circuit breaker. The dc circuit breaker can be used to close the flow or to trip the power in circuits. The reliable element of dc is that it can even be used when the ac circuit systems have failed. Therefore, they can provide reliability, less failure, and less maintenance worry.

Q: What are the characteristics of DC breaker?

A: The mechanical DC circuit breaker consists of a high-speed DC switch, a LC divergent oscillation circuit and a surge arrester. This creates an artificial zero-point by affecting the blocking of the DC fault current according to the LC diverging oscillation circuit.

Q: What is the difference between AC and DC miniature circuit breakers?

A: While the two types of MCB have the same purpose, the main difference between them is their voltages. AC MCBs protect against high-frequency surges, while DC ones protect against short-circuit problems.

Q: What is the difference between 1p and 2p DC circuit breaker?

A: A single pole breaker is typically used with 120-volt circuits, 15-20 amps. They are constructed with one hot wire and one neutral wire. A double pole breaker is primarily used with a 240-volt circuit, 20-60 amps and consists of two hot wires.

Q: Are DC breakers directional?

A: By convention most all breakers are built directional with the supply coming into the top and the load going from the bottom. The switch lever points to the supply when on. In practice AC breakers do not really care which is supply and load however DC breakers do.

Q: How does a DC circuit breaker work?

A: DC circuit breakers act the same way as AC circuit breakers, with heat and magnetic protection. When the electric current exceeds the rated value, the thermal protection trips the breaker. The bimetallic contact heats up and expands as the current generates much more heat.

 

Our company is one of the leading DC circuit breaker manufacturers and suppliers in China, providing the best customized service. Welcome to wholesale high quality DC circuit breaker for sale here and get quotation from our factory.

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