Pronto Energy 
KNM7DC DC Moulded Case Circuit Breaker (DC MCCB)
The KNM7DC 2P 400-630A DC moulded case circuit breaker provides overload and short-circuit protection for photovoltaic, wind-power and DC distribution systems up to 1000 V. Its dedicated DC arc-quenching design ensures reliable interruption of DC fault currents.
Applications & circuit protection
The KNM7DC DC MCCB is engineered for high-voltage DC applications including solar farms, battery energy-storage systems and industrial DC distribution, where reliable DC interruption is critical.
- Photovoltaic DC arrays and combiner circuits
- Battery energy-storage systems (BESS)
- Wind-power DC distribution
- Industrial high-voltage DC feeders
Construction & operating reliability
The KNM7DC features a dedicated DC arc-extinguishing system, thermal-magnetic protection and a rugged moulded housing rated for high DC voltages and currents.
- Dedicated DC arc-extinguishing design
- Overload and short-circuit protection
- Rated up to {voltage} DC
- Vertical or horizontal installation
Technical Parameter
| Parameter | Value |
| Compliant with standards | GB/T 14048.1, GB/T 14048.2 |
| Application | Photovoltaic, wind-power and DC distribution systems |
| Number of product poles | 2P / 3P |
| Rated working voltage | 1000 V DC |
| Rated working current | 400–630A |
| Protection functions | Overload and short circuit |
| Ambient temperature | -45°C to +70°C |
| Maximum installation altitude | 2,000 m |
| Pollution degree | 3 |
| Installation orientation | Vertical or horizontal |
Standards & certifications
The KNM7DC is designed in accordance with GB/T 14048.1, GB/T 14048.2 and is available with CB, CE certifications. Certification documentation can be provided according to project and destination-market requirements.
- Standard: GB/T 14048.1, GB/T 14048.2.
- Certifications: CB, CE.
- Protection level: IP20 (where applicable).
OEM & B2B supply support
KORLEN supports distributors, OEM manufacturers, electrical contractors and project buyers with product selection, samples, technical documentation and commercial quotations.
If the KNM7DC configuration does not match your project, send us the required specifications, quantity and destination market. Our team can help identify a suitable configuration.
- Samples available for product evaluation.
- Flexible quantities for project and B2B purchasing.
- OEM and ODM support for suitable projects.
- Technical documentation and certification support available.
Frequently Asked Questions
The KNM7DC protects DC circuits against overload and short circuit in photovoltaic, wind-power and DC distribution systems.
The KNM7DC is rated for 1000 V DC operation with a current range of 400-630A.
DC arcs do not self-extinguish. The KNM7DC uses a dedicated arc-quenching design to interrupt DC faults reliably and safely.
It is installed in DC combiner boxes, switchboards and distribution panels for solar and energy-storage systems.
