2P DC Circuit Breaker - Miniature Circuit Breakers for DC and Solar Generation
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2P DC Circuit Breaker - Miniature Circuit Breakers for DC and Solar Generation

Langir Electric
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The JB is a DC circuit breaker specifically designed for multi-string photovoltaic installations. This breaker is engineered to provide essential protection against overloads and short circuits in the...


The JB is a DC circuit breaker specifically designed for multi-string photovoltaic installations. This breaker is engineered to provide essential protection against overloads and short circuits in the circuits connecting photovoltaic modules to the inverter. Notably, the JB is not polarity sensitive, allowing (+) and (-) wires to be connected inversely without any risk. It meets various international standards, including IEC 60947-2, EN60947-2, and GB 14048.2, ensuring compliance and safety in a range of operating conditions.

Download Circuit Breakers for Solar Photovoltaic Datasheet (PDF)


  • Voltage and Pole Configuration: Supports a broad operating voltage range from 12 to 1000 VDC and is available in configurations of 1P, 2P, 3P, and 4P, catering to different system requirements.
  • Current Rating: Offers a versatile range of ratings from 1 to 63 A, suitable for various installation sizes.
  • Breaking Capacities: Provides effective breaking capacities between 5 to 10 kA depending on the compliance standard, which enhances safety by ensuring the breaker can handle significant fault conditions.
  • Tripping Curves: Includes tripping curves C, D, and K, allowing for precise protection tailored to specific load characteristics and conditions.
  • Isolation Capability: Suitable for complete electrical isolation in compliance with industrial standard IEC 60947, enhancing the safety of maintenance operations.
  • Connection Options: Features multiple connection possibilities such as box lug and ring tongue terminal, offering flexibility in installation.
  • Safety Lock Feature: Can be locked in the OFF position using a padlocking device, ensuring safety during maintenance or removal of the PV inverter.
  • Bidirectional Current Protection: Capable of detecting and protecting against currents that may flow in the reverse direction, thereby ensuring the reliability of the electrical system.
  • Integration with Safety Devices: For complete system safety, it is recommended to combine the JB with additional devices such as a residual current device at the AC end, a fault passage detector at the DC end, and an earth protection circuit breaker, also at the DC end.
  • Enhanced Isolation: Delivered with three inter-pole barriers that increase the isolation distance between two adjacent connectors, further enhancing safety

Typical Applications

Main Characteristics
Operating voltage (Ue) 1P=250 V DC, 2P=500 V DC
3P=750 V DC, 4P=1000 V DC
Rated insulation voltage (Ui) 1,000 V DC
Breaking capacity (Icu) 10 kA
Impulse voltage (Uimp) 4 kV
Electrical connection By the bottom for In and Out
Number of poles 1P, 2P, 3P, 4P
Standards IEC 60947-2
EN 60947-2

Technical Data

■ Position contact indication - suitability for isolation according to IEC/EN 60947-2 standard.
■ The presence of the green strip guarantees physical opening of the contacts and allows operations to be performed on the downstream circuit in complete safety.
■ Increased product service life thanks to fast closing independent of the speed of actuation of the toggle.
■ Pre-wired product: Input / Output on the same side.

Main characteristics
Rated service breaking capacity (Ics) 100 % of the Icu
Endurance (O-C) Electrical 1,500 cycles (where L/R=2 ms)
Mechanical 20,000 cycles
Mechanical 20,000 cycles
Degree of pollution 2
Category A (no delay in accordance with IEC / EN 60947-2 standards)
Degree of protection Device in modular (IEC 60529) enclosure IP40
Tropicalisation Relative humidity: 95 % at 55°C in accordance with IEC 60068-2 and GB 14048.2 standards
Temperature Operating -25°C to 70 °C
Storage -40°C to 85°C

DC Rated Circuit Breakers

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On the product detail page of every series you will find information about the switch. If it is washable or sealed to a certain IP rating, it will list it on the product detail page. To get to the product detail page, go to our product catalog and search by type or by feature.
It is a safe assumption to note that all Langir switches comply with EN 60529.

It is a safe assumption to note that all our switches comply with RoHS standards. You can find our complete library of RoHS certifications by part number, Certifications.

We have solder profile recommendations for hand soldering, SMT reflow and wave soldering processes. You can find our recommendations Soldering Profiles.

Help can be given either over the phone by sending the fix parts to you, or we will requires you to send products back to us for fixing.

Water-Wash, Process-Sealed, IP67 Switch Seal Rating
Definition of IP Codes (Ingress Protection):
IEC (International Electrotechnical Commission) 60529 Standards document specifies an international Classification system for the sealing effectiveness of enclosures of electrical equipment against the “Intrusion into the equipment of foreign bodies and moisture”.
1.  Degrees of Protection – First Digit
6      Dust-tight
2.  Degrees of Protection – Second Digit
7     Protection against effects of immersion from 15cm to 1m (6″ to 40″).
Based on the above, our standard for defining a “process-sealed” switch is “sealed to meet the minimum requirements of IP-67”.  This means that a switch rated to IP-67 is “Dust-tight” and will pass a water submersion test at 40″ (1m), for up to 30 minutes.
Due to the variables encountered in actual water-wash machine processing, IP67 does not necessarily insure that water entry into the switch cannot occur.  the water-wash pressures and air-knife drying that occurs in modern pcb machine-washing can exceed the seal requirements of the IP-67 rating.

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