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Externally triggered pyrotechnic fuse for high-voltage DC circuits. Fired by a signal from the management system, it interrupts the circuit in 2 ms or less, with full-range protection, and self-triggers at 250 °C or above.
Used for short-circuit and overload protection of electric vehicle drive systems, power conversion systems, batteries, energy storage capacitors and inverters — in road vehicles, wind energy, photovoltaic and energy storage.
500 V DC · 350 A · no minimum breaking current · bolted M8, 12 ± 1 N·m. Two versions of the same fuse, differing by their igniter connector:
SFM-350-B — connector AKII-Code I (JST), mating connector SQXW · 350 A on a 120 mm² busbar at 85 °C · 20 kA at 3 µH · CE and DOT certified, RoHS and ELV compliant.
SFM-350-BA — connector ABX5-Code X (Aptiv) · 350 A on a 100 mm² busbar at 85 °C · 23.5 kA at 3 µH · RoHS compliant.
UL94-V0 flame rating. Built to LV124, ISO 8820 and IEC 60269; qualified to LV16.
Specifications
Brand
Sinofuse
Product family
Pyro Fuses
Series
SFM-350-B / SFM-350-BA
Rated voltage
DC 500 V
Current type
DC
Breaking capacity
20 kA @ DC 500 V / 3 µH (SFM-350-B) · 23.5 kA @ DC 500 V / 3 µH (SFM-350-BA)
Trigger type
External
Action time
≤ 2 ms
Trigger current
≥ 1.75 A / 0.5 ms or ≥ 1.2 A / 2.0 ms
Non-triggering current
≤ 0.4 A / 10 s
Allowable detection current
≤ 100 mA
Igniter resistance
1.7 to 2.3 Ω
Self-triggering temperature
≥ 250 °C
Mounting type
Bolted
Flame retardant rating
UL94-V0
Reference standards
LV124 · ISO 8820 · IEC 60269 · LV16
RoHS compliant
Yes
Application sectors
Automotive, Wind energy, Photovoltaic, Energy storage
Typical applications
Short-circuit and overload protection for EV drive systems, power conversion systems, batteries, energy storage capacitors and inverters. Designed for BMS applications. Rated current given at 85 °C on a 120 mm² busbar (SFM-350-B) or 100 mm² busbar (SFM-350-BA). Insulation resistance ≥ 100 MΩ between busbar and igniter, ≥ 5 MΩ between busbar sections after break.
