The JB is a DC circuit breaker dedicated to multi string photovoltaic installations.
Storage -40 to 85 degree
- 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: (+) and (-) wires can inversed without any risk.
- The JB is: delivered with three inter-pole barrier to provide increased isolation distance between two adjacent connectors.
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 VDC |
| Breaking capacity (Icu) | 10 kA |
| Impulse voltage (Uimp) | 4 kA |
| Electrical connection | By the bottom for In and Out |
| Number of poles | 1P, 2P, 3P, 4P |
| Standards | IEC 60947-2 EN 60947-2 |
| 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 (IEC 60529) | IP40 | |
| Tropicalisation | Relative humidity: 95% at 55 degree in accordance with IEC 60068-2 and GB 14048.2 standards | |
| Temperature | Operating | -25 to 70 degree |
| Storage | -40 to 85 degree | |
