4P DC Circuit Breaker - Miniature Circuit Breakers for DC and Solar Generation
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4P 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. It ensures the safety and efficiency of the electrical connections between photovoltaic modules and inverters by protecting...


The JB is a DC circuit breaker specifically designed for multi-string photovoltaic installations. It ensures the safety and efficiency of the electrical connections between photovoltaic modules and inverters by protecting against overloads and short circuits. This circuit breaker is characterized by its non-polarity sensitivity, meaning that (+) and (-) wires can be connected inversely without any risks. It complies with multiple international standards, including IEC 60947-2, EN60947-2, and GB 14048.2, catering to a broad range of installation requirements.

Download Circuit Breakers for Solar Photovoltaic Datasheet (PDF)


  • Operating Voltage Range: Capable of handling a wide range of operating voltages from 12 to 1000 VDC, accommodating various photovoltaic system sizes.
  • Pole Configuration Options: Available in several configurations, including 1P, 2P, 3P, and 4P, to suit different system requirements and installation practices.
  • Current Rating: Offers a broad spectrum of current ratings from 1 to 63 A, enabling flexibility in application and system design.
  • Breaking Capacities: Features breaking capacities ranging from 5 to 10 kA, depending on the specific standard applied, providing robust fault interruption capabilities.
  • Tripping Curves: Equipped with tripping curves C, D, and K to match the protective needs of various electrical load characteristics.
  • Isolation Compliance: Meets the industrial standards for isolation according to IEC 60947, enhancing safety during maintenance and operational adjustments.
  • Connection Versatility: Supports multiple connection types including box lug and ring tongue terminals, offering flexibility in the installation process.
  • Safety Lock Feature: Includes a padlocking device that allows the breaker to be securely locked in the OFF position, ensuring safety during maintenance or system modification.
  • Bidirectional Current Detection: Capable of detecting and protecting against fault currents that flow in reverse direction, thus maintaining system integrity and safety.
  • Comprehensive System Integration: To maximize safety, the JB should be combined with additional protective 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 Features: Delivered with three inter-pole barriers that increase the isolation distance between adjacent connectors, further safeguarding against electrical hazards.

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

DimensionDC 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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