DC Circuit Breaker 4P 25A 30mA Residual Current Protection with Electromagnetic Fast Trip

DC Miniature Circuit Breaker Nl163 — 25A variant, 3P 1N (4P) configuration available Product overview This DC circuit breaker combines overload and shortcircuit protection with residual current detection and a magnetic arc extinguishing system. It is designed for DC power distribution and photovoltaic systems to improve reliability and protect equipment and personnel. Key benefits Reliable protection: Prevents overloads and short circuits from damaging wiring, inverters, batteries, and downstream equipment. Also provides switching for control and isolation. Fast fault response: Electromagnetic instantaneous trip operates immediately on shortcircuit events to minimize fault duration and equipment stress. Leakage detection: 30mA residual current protection detects dangerous leakage currents and helps reduce shock risk and fire hazard from earth faults. Improved DC arc control: Magneticassisted arc extinguishing reduces arcing duration on DC circuits, where arc quenching is more difficult than on AC. Flexible configurations: Available in 1P+N, 2P, 3P+N, and 4P arrangements with rated currents such as 25A, 40A, and 63A to suit different system sizes. Key specifications Model: Nl163 Size / rated current: 25A variant shown; other rated options include 40A and 63A Pole configurations: 1P+N, 2P, 3P+N (noted as 3p 1n or 4p), 4P Residual current sensitivity: 30mA Tripping: Electromagnetic fast trip for short circuits; residual current tripping for leakage protection Function: Overload and shortcircuit protection, control, and isolation for DC systems Why choose this breaker Designed specifically for DC applications, including PV and battery systems, where rapid magnetic tripping and arc suppression are critical. Combines residual current protection and shortcircuit protection in a single device to reduce component count and simplify distribution panels. Multiple pole and current options allow selections that match system voltage, current rating, and neutral handling requirements. Typical applications and scenarios Solar photovoltaic array protection: Install in combiner boxes or DC distribution panels between PV strings and the inverter to protect against short circuits and earth leakage. Battery energy storage systems: Protect DC battery strings and DC bus segments from overloads, short circuits, and leakage faults during charge and discharge cycles. Telecom, industrial, or offgrid DC distribution: Use in DC power racks or distribution panels to provide rapid fault isolation and leakage detection for sensitive DCpowered equipment. Installation and compatibility notes Select the appropriate pole configuration and rated current to match system architecture and expected fault levels. Choose the 30mA residual current option when human safety and earthfault detection are required. Use this device in DC systems and photovoltaic installations where electromagnetic tripping and magnetic arc extinguishing improve protection effectiveness. This Nl163 DC circuit breaker variant provides compact, fastacting protection for DC distribution, combining electromagnetic shortcircuit tripping, residual current detection at 30mA, and magneticassisted arc extinguishing to address common DC protection challenges.