2 Pole DC Circuit Breaker
  • IEC 60947-2, EN60947-2, GB 14048.2
  • 1 P=250 V DC, 2P=500 V DC 3P=750 V DC, 4P=1000 V DC
  • Different curve

 

IEC 60947-2, EN60947-2, GB 14048.2
The JB is a DC circuit breaker dedicated to multi string photovoltaic installations.
This circuit breaker is designed to protect the cables located between each string of photovoltaic modules and the photovoltaic inverter against overloads and short circuits (see application diagram).
Combined with a switch, the JB will be installed in a string PV protection enclosure at the end of each string of photovoltaic modules.
It can be locked (by a padlocking device) in OFF position as a safety measure for removal of the PV inverter.
Since a fault current can flow in the reverse direction to the operating current, the JB can detect and protect against any bidirectional current.
To ensure the safety of the installation, it is necessary, depending on the various types of application, to combine the JB with:

  • a residual current device at the AC end
  • a fault passage detector (insulation monitoring device) at the DC end
  • an earth protection circuit breaker at the DC end
    In all cases, fast action on site will be required to clear the fault (protection not ensured in the event of a double fault).

JB is not polarity sensitive: (十) and (-) wires can be inversed without any risk.
The JB is: delivered with three inter-pole barriers to providing increased isolation distance between two adjacent connectors.

1-1P DC Circuit Breaker for solar

DC circuit breaker E-catalogue, please download it below:

Langir E-Catalogue

Langir 2P DC Circuit Breaker Introduction

Langir is the top and dependable supplier of 2P DC circuit breakers in China.

Their 2P DC circuit breakers are built with precision ensuring only the best switch performance and reliability.

A 2P DC circuit breaker is a defensive electrical switch that acts as a safeguard of your electrical circuit against the damage done by overloading or short circuit.

2P DC circuit breaker

2P DC circuit breaker

2P DC Circuit Breaker Working Principle

The 2P DC circuit breaker acts as a switch that automatically cuts the flow of electrical supply in the event of a spike in the current.

The electrical load is supplied to the positive and negative poles on one side while the power supply is connected on the other two poles.

This means that if there is a current problem on either of the poles, the 2P DC circuit breaker will trip and the current flow stops.

1P DC Circuit Breaker vs 2P DC Circuit Breaker

When you compare the appearance of the 1P DC circuit breaker and the 2P DC circuit breaker, the 1P DC circuit breaker looks like a narrow shaped switch with a lever while the 2P DC circuit breaker is double the size, two narrow switches molded together where a lever is built in.

The 1P DC circuit breaker only has two poles, the positive and negative poles.

While the 2P DC circuit breaker has four poles, so there are two poles for each positive and negative.

Moreover, the 2P DC circuit breaker is generally installed for two separate circuits like 120 volts or 240 volts.

While the 1P DC circuit breaker typically serves lower voltages such as 120 volts and below.

Side by side comparison of 1P & 2P DC circuit breakers

Side by side comparison of 1P & 2P DC circuit breakers

The Langir 2P DC Circuit Breaker Advantage

A Langir’s 2P DC circuit breaker has four poles, so there are two poles for each positive and negative.

Best of all, it is not polarity sensitive so the positive and negative wires can be interchangeable without any risk.

It is designed to give protection to cables found in each string of photovoltaic inverter and modules as preventive measures of overloads or short circuits.

In addition, all Langir’s circuit breakers can be locked while in the off position as an added measure for safety.

So when you need to buy 2P DC circuit breakers built with precision engineering and complies with high quality standards, you can always depend on Langir.

Application of the 2P DC Circuit Breaker

You can use the 2P DC circuit breakers on the following applications:

  • Centralized air condition units
  • Electric dryers
  • Electrical stoves
  • Electrical water heaters

You can also use Langir’s 2P DC circuit breakers on lower voltage appliances or circuits and other similar applications.

2P DC circuit breaker applications

2P DC circuit breaker applications

Ordering the Langir 2P DC Circuit Breaker

Langir is a manufacturer that has been in the industry for many years and they have been recognized by many independent certification organizations.

With Langir, you can inquire about the 2P DC circuit breakers whether you want to buy several units or more.

Simply send an inquiry form or call their customer service hotline and their friendly sales associates will be happy to assist you in any of your 2P DC circuit breakers inquiries.

You can also consult about your circuit breakers needs to our experts to ensure that you will receive what you need.

Certified by many international safety and quality governing bodies, the 2P DC circuit breakers from Langir are tough and built to last.

With the easy snap in mounting, you can install the 2P DC circuit breakers within minutes right after you’ve received them.

You can rely on Langir to deliver your high quality 2P DC circuit breakers fast with guaranteed satisfaction.

Contact Langir to order now.

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