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Product Overview
Unlike alternating current, high-voltage direct current (DC) lacks a natural "zero-crossing" point, making DC arc flashes incredibly violent and difficult to extinguish. Standard breakers will disintegrate under such stress. The CHNAILE Heavy-Duty 2-Pole DC Molded Case Circuit Breaker (MCCB) is a purpose-built DC isolation leviathan. Engineered to master continuous 250-Ampere payloads within DC 1000V architectures, it provides an impenetrable 2-wire barrier between utility grids and your most expensive capital equipment. Featuring industry-topping 1500V dielectric insulation and a 100% Service Breaking Capacity (Ics=Icu=15kA), this specialized switchgear guarantees survival in the hyper-demanding realms of EV Supercharging and transit power grids.
Technical Parameters
Device Category: | Heavy-Duty DC Molded Case Circuit Breaker (DC MCCB) |
|---|---|
Poles Configuration: | 2P (Bipolar DC+ and DC- Isolation) |
Rated Current (In): | 250A (Massive capacity for DC fast charging & traction) |
Rated Operating Voltage (Ue): | DC 1000V |
Rated Insulation Voltage (Ui): | 1500V (Apex-tier dielectric strength) |
Rated Impulse Withstand Voltage (Uimp): | 12kV (Extreme lightning & grid surge immunity) |
Ultimate Short-Circuit Breaking Capacity (Icu): | 15kA (Specifically engineered for DC arcs) |
Service Short-Circuit Breaking Capacity (Ics): | 15kA (100% of Icu for sustained reliability) |
Application Category: | CAT A |
Standard Compliance: | GB/T 14048.2 / IEC 60947-2 |
1. Elite High-Voltage DC Fault Mitigation
Dedicated DC Arc Extinction: Equipped with specialized permanent magnets and elongated arc chutes, this MCCB forces, elongates, and aggressively suffocates relentless 1000V DC fault plasmas in milliseconds, preventing catastrophic cabinet meltdowns during a dead short.
100% Ics=Icu Reliability: An Ics rating equal to Icu (15kA) means this breaker doesn't just survive a massive short circuit once; it remains fully operational and reliable to carry continuous 250A loads even after clearing an extreme fault, drastically reducing replacement costs.
Bipolar Complete Isolation: Simultaneous tripping of both the positive and negative poles guarantees total zero-voltage physical isolation, ensuring absolute safety for technicians performing maintenance on high-voltage DC busbars.
2. Fortified Structural Engineering
1500V Dielectric Thermosetting Armor: Housed in a structurally reinforced, V0-rated polymer block. The extraordinary Ui 1500V and Uimp 12kV ratings act as an impenetrable dielectric firewall, shielding downstream rectification modules from direct lightning strikes on outdoor EV charging canopies.
Massive Silver-Tungsten Terminations: The internal moving contacts and deep-set bolt-on lugs are forged to minimize DC resistance. They safely dissipate the continuous thermal energy generated by routing 250kW of DC power, eliminating micro-welding risks.
Mechanical Linkage Audit (Red 'Push to Trip'): Features a prominent red manual test button. In highly vibrating environments like railway hubs, this allows engineers to physically verify the health of the tripping mechanism before authorizing live operations.
3. Target Application Scenarios
Due to its colossal DC 1000V/250A capacity and specialized DC arc management, this MCCB is strictly specified by global EPCs for:
Megawatt EV Supercharging Hubs (MCS): Acting as the primary bipolar DC disconnect for massive Level 3 fast-charging rectification cabinets catering to commercial electric bus and trucking fleets.
Railway & Tram DC Traction Networks: Providing heavy-duty, vibration-resistant power isolation for municipal tramways, metro rail DC substations, and rolling stock power feeds.
Industrial DC Microgrids: Serving as the main protective switchgear for centralized battery banks and localized DC distribution in advanced manufacturing facilities.
Heavy Marine DC Propulsion: Safeguarding the immense DC link architecture in hybrid-electric vessels and offshore drilling platforms.
4. Global B2B Partnership with CHNAILE Factory
Direct Supply of Core DC Infrastructure: Sourcing heavy-duty DC switchgear directly from our manufacturing floor bypasses massive international trader margins, providing your EPC firm a decisive advantage in bidding for national-level EV and transit projects.
Exhaustive IEC DC Testing: DC testing is exponentially more demanding than AC. Every 250A unit undergoes brutal thermal imaging, simulated 15kA DC short-circuit blasts, and 12kV impulse testing to guarantee 100% standard compliance.
Premium OEM Panel Builder Solutions: Leveraging our vast manufacturing footprint, we offer tailored OEM solutions—including customized laser-engraved nameplates and specialized phase barriers—allowing premium system integrators to scale their brand effortlessly.
