The FRN500G1S-4U is a Type SPD (surge protective device) from Fuji Electric, housed in a NEMA 4 enclosure for washdown or outdoor environments. Side-mount configuration keeps the unit out of the main wiring trough, useful when panel depth is tight or the SPD needs to sit near the line entry point. Its DC interrupt rating is 300 A — that's the maximum fault current the SPD can safely interrupt on a DC bus. For a 500 HP drive at 480 V, the DC bus sits around 650 VDC; this SPD needs to clear any follow current from a surge event on that bus. The 300 A figure tells you the internal MOVs and thermal disconnect are sized for that energy level, not just a signal-level transient.
FRN500G1S-4U SPD, NEMA 4, 300 A DC Interrupt
MPNFRN500G1S-4U
Fuji Electric FRN500G1S-4U, Type SPD, Side Mount, NEMA 4, 300 A DC Interrupt Rating.
$706.00Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Type | SPD |
| Mounting | Side |
| IP (NEMA rating) | NEMA 4 |
| Interrupt rating DC | 300 |
Product details
Frequently asked questions
What is the DC interrupt rating of the FRN500G1S-4U?
The DC interrupt rating is 300 A, which is the maximum fault current the SPD can safely clear on a DC bus.
What is the enclosure rating of the FRN500G1S-4U?
It carries a NEMA 4 rating, suitable for indoor or outdoor use where hose-down or dust ingress is a concern.
MPN
FRN500G1S-4U