1P DC Circuit Breaker - Miniature Circuit Breakers for DC and Solar Generation
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1P 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 engineered for multi-string photovoltaic installations. This breaker is designed to safeguard the wiring between photovoltaic module strings and the inverter from overloads...


The JB is a DC circuit breaker specifically engineered for multi-string photovoltaic installations. This breaker is designed to safeguard the wiring between photovoltaic module strings and the inverter from overloads and short circuits. Notably, the JB is not sensitive to polarity, meaning that the (+) and (-) wires can be connected in reverse without any risk. It adheres to multiple standards, including IEC 60947-2, EN60947-2, and GB 14048.2, ensuring compliance and reliability.

Download Circuit Breakers for Solar Photovoltaic Datasheet (PDF)


  • Voltage and Configuration Flexibility: Supports operating voltages from 12 to 1000VDC and is available in multiple pole configurations including 1P, 2P, 3P, and 4P.
  • Current Rating: Offers a broad range of current ratings from 1 to 63 A, accommodating various installation sizes and requirements.
  • Breaking Capacities: Provides breaking capacities ranging from 5 to 10 kA, depending on the standard, which helps to ensure robust fault protection.
  • Tripping Curves: Includes tripping curves C, D, and K, allowing for tailored protection based on specific circuit characteristics.
  • Standards Compliance: Suitable for isolation according to IEC 60947, ensuring safety and adherence to industrial standards.
  • Connection Options: Features multiple connection possibilities such as box lug and ring tongue terminal, offering flexibility in installation.
  • Safety and Locking Mechanisms: Can be locked in the OFF position using a padlocking device to ensure safety during maintenance or removal of the PV inverter.
  • Bidirectional Current Protection: Capable of detecting and protecting against currents flowing in reverse direction, enhancing the safety of the system.
  • Integration with Other Safety Devices: To ensure comprehensive safety, the JB can be combined with a residual current device at the AC end, a fault passage detector (insulation monitoring device) at the DC end, and an earth protection circuit breaker 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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