DC Fuse Solutions: 1500V Protection for Solar & Storage

The fuse rating is determined by the short-circuit current and continuous current of the solar panel string. ITC expects the fuse to withstand normal operation without nuisance tripping, but clear quickly under fault conditions. First, calculate the panel's maximum current (Isc) and multiply it by 1.25 to account for irradiance levels. Next, ensure the fuse's rated voltage is greater than the maximum system voltage (often 1000V or 1500V). Also consider factors like temperature derating and conductor sizing. At ZHNYU ELECTRIC, we provide fuse sizing software and application notes; you can also contact our engineers for a personalized assessment. Proper sizing ensures both safety and minimal downtime.

No. DC circuits are prone to sustained arcs, which can keep an arc blazing across the breaker’s contacts, leading to severe damage and fire risk. Circuit breakers have a mechanical limit to interrupt DC currents; without a neutral point, they may not clear the short-circuit promptly. Moreover, the design of a DC fuse (as in our product) provides current-limiting effect that reduces let-through energy, protecting equipment more effectively. Exception: there are specific DC molded-case breakers instead, but they are not equivalent to fuses. For maximum safety, standard practice is to employ a DC fuse specifically designed for photovoltaic systems. In high-risk environments, fuses remain the preferred protective device due to their superior arc suppression.

The most relevant standards are IEC 60269-6 (for gPV fuses) and UL 248-19 (for photovoltaic fuses). These regulations cover performance, temperature, and breaking requirements. For example, our fuses meet both gPV and UL classes. It is also crucial to ensure that the DC fuse has a high interrupting rating (at least 20 kA DC) for transmission-level faults. In addition, we often test to IEC 60947 series, ensuring they are suitable for industrial use. When purchasing, look for certification marks: ISO, CE, CCC, RoHS, etc., which prove that the product has undergone rigorous type tests and factory audits. Compliance with these standards ensures safe integration into global installations, which is why 60+ countries trust our products.