SINOFUSE: The Pyro and Smart Fuses Protecting Our DC Energy Systems
A contactor switches DC. A fuse is what saves the pack when the contactor is not fast enough. SINOFUSE is the supplier we trust with that last line of defence.
Xi’an Sinofuse Electric builds circuit protection for new energy vehicles, electrochemical storage, data centres, PV and wind, eVTOL, rail and industrial control. The company puts more than 10% of revenue into R&D, employs over 420 engineers, holds 360+ patents and runs a 3,000 m² CNAS-accredited test centre — and it leads China’s domestic power fuse market.
Two technologies matter most for DC designs. Controllable protection lets a fuse receive a system command and disconnect at zero or low current — the mechanism behind EV collision cut-off and storage overcharge protection. Full-range breaking covers 0 to 30 kA, which is what clears the awkward faults: PV string backfeed, storage cascade events, and low-multiple overloads that ordinary fuses simply sit through.
What we stock
- Pyro fuses — SFM series at DC 500 V / 350 A and SFH series at DC 1000 V / 400 A, triggered on command.
- Smart fuses — PFH and PFS series, DC 700 V to DC 1000 V, 250 A to 600 A, with status feedback.
- Power fuses — RS306 series covering AC 690 V and AC 1000 V from 10 A up to 3,500 A for AC-side and PCS protection.
- High-speed DC fuses — RS309 series: RS309-MM-EV at DC 1000 V from 450 A to 800 A with 25 kA breaking capacity for industrial and EV battery packs; RS309-MD at 500 V DC/AC in 1,000 A and 1,200 A for chargers, ESS and PV.
Global, and getting closer
SINOFUSE already serves customers in more than 20 countries and regions, with offices in Korea, Germany, Japan, the United States, Thailand and Singapore. Its appearance at INTER BATTERY in Seoul this March was part of that push: engineers there spent the show on relay performance and raw-material supply questions raised by major Korean battery makers — a signal that overseas programmes are being resourced, not just visited.
Coordinating a fuse with a DC contactor is where most protection designs go wrong. Send us system voltage, continuous current and prospective short-circuit current, and we will match the fuse and the contactor as one coordinated pair, with datasheets and a quote.