DC SPD

A: DC power systems lack a natural current zero-crossing point, meaning any electric arc formed during a fault tends to sustain itself. Consequently, DC SPDs utilize specialized thermal disconnectors with enhanced arc-extinguishing chambers and higher continuous operating voltage ratings (Ucpv) compared to AC equivalents, preventing thermal runaway caused by continuous reverse leakage current.

A: Many Kinee DC SPD models feature an integrated internal backup disconnector and can withstand short-circuit currents up to 10 kA or 50 kA without external back-up fuses (Iscpv). If the source short-circuit current of the DC network exceeds the device's rated short-circuit withstand, an external back-up fuse (gPV type) matching the manufacturer's maximum specified rating must be installed upstream.

A: Each protection module features a dual-state mechanical indicator window: Green indicates normal operating status, while Red signifies that the internal thermal disconnector has tripped due to end-of-life or severe surge exposure. Additionally, models equipped with remote signaling contacts transmit an open/close dry-contact status to the central PLC or SCADA system.

A: Yes. Our standard production series are tested and certified in accordance with IEC 61643-31 / EN 50539-11 standards for European market access. For North American deployments requiring UL compliance, we offer specific variants engineered and tested to UL 1449 4th Edition requirements. Complete test reports and certificates are available upon request.

A: Yes. We offer comprehensive OEM/ODM customization services. We can adjust varistor configurations to meet specific residual voltage thresholds and apply your brand logo, part numbers, and specialized terminal markings via industrial laser engraving for batch orders.

A: Standard catalog items in standard packaging are maintained in inventory and ship within 3 to 5 business days. Custom OEM orders—including specialized labeling, custom Ucpv ratings, or specific connector configurations—typically require a lead time of 3 to 4 weeks from technical drawing sign-off to factory dispatch.