Sinofuse Fuse RS309-Mf H 40A
Part of the RS Series (High-Speed Fuses)| Rated Voltage: | 690VAC |
| Rated Current: | 40A |
| Class: | aR (Semiconductor Protection) |
| Size: | NH000 |
Product Description
The Sinofuse RS309-Mf H 40A is an extremely fast-acting fuse from the aR class, specifically engineered to provide superior protection for power semiconductors such as diodes, thyristors, GTOs, and IGBTs. Its low I²t value minimizes let-through energy during a fault, preventing damage to sensitive and expensive electronic components in industrial applications.
Distributor's FAE Review
"For any application involving variable frequency drives (VFDs) or soft starters, the RS309 series is our go-to recommendation. The 'aR' class means it's incredibly fast, which is essential for protecting IGBT modules that have very low fault current withstand ratings. We've seen these fuses save entire drive systems from catastrophic failure. Their compact NH000 size is also a huge plus for space-constrained industrial panels."
Full Technical Specifications
Data sourced from Sinofuse datasheets. Always refer to the latest PDF for certified values.
Frequently Asked Questions
What is the difference between gG and aR class fuses?
A gG fuse is a general-purpose fuse that provides both overload and short-circuit protection. An aR fuse is a partial-range fuse that provides extremely fast short-circuit protection for semiconductors but may require separate overload protection.
Can I use this fuse in a DC circuit?
While primarily designed for AC, many aR fuses have a DC voltage rating. Please consult the datasheet for the specific DC voltage and interrupting rating for this model.