3P DC Circuit Breaker - Miniature Circuit Breakers for DC and Solar Generation
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3P DC Circuit Breaker - Miniature Circuit Breakers for DC and Solar Generation

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The JB is a specialized DC circuit breaker tailored for multi-string photovoltaic installations. This breaker is designed to handle the specific demands of photovoltaic systems, offering robust protection against overloads...


The JB is a specialized DC circuit breaker tailored for multi-string photovoltaic installations. This breaker is designed to handle the specific demands of photovoltaic systems, offering robust protection against overloads and short circuits in the wiring between each string of photovoltaic modules and the photovoltaic inverter. It stands out due to its non-polarity sensitivity, which allows (+) and (-) wires to be connected inversely without risk, ensuring flexibility and safety in installation. The JB complies with several international standards including IEC 60947-2, EN60947-2, and GB 14048.2, making it a reliable choice for a wide range of applications.

Download Circuit Breakers for Solar Photovoltaic Datasheet (PDF)


  • Wide Operating Voltage Range: Capable of handling voltages from 12 to 1000 VDC, accommodating various sizes of photovoltaic installations.
  • Multiple Pole Configurations: Available in 1P, 2P, 3P, and 4P options to suit different system requirements and installation scenarios.
  • Adjustable Current Rating: Offers a versatile range of current ratings from 1 to 63 A, allowing for customization based on system demands.
  • Variable Breaking Capacities: Features breaking capacities ranging from 5 to 10 kA depending on the applicable standard, providing effective fault management.
  • Diverse Tripping Curves: Equipped with tripping curves C, D, and K to precisely match the protective needs of various load characteristics and operational conditions.
  • Standards Compliance for Isolation: Meets the requirements for electrical isolation according to IEC 60947, enhancing safety during maintenance and system adjustments.
  • Flexible Connection Options: Includes multiple connection possibilities like box lug and ring tongue terminals, offering installation flexibility.
  • Safety Lock Mechanism: Can be securely locked in the OFF position using a padlocking device to ensure safety during system servicing or modification.
  • Bidirectional Current Protection: Capable of detecting and protecting against currents flowing in reverse, safeguarding the system’s integrity and functionality.
  • Enhanced Safety Integration: Recommends integration with additional safety 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 to maximize system safety.
  • Improved Isolation Features: Delivered with three inter-pole barriers, increasing the isolation distance between adjacent connectors to prevent 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

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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