Non-String Monitoring Combiner Box
String Fuse Boxes.
EPA-SFB & EPA-SFBDTwo compact, economical solutions for string-level overcurrent protection — with or without reverse current protection via blocking diode.
SFB
String Fuse Box Compact overcurrent protection, no DC isolation
SFBD
+ Blocking Diode Adds reverse current protection per string
2–32 IN
Multi-String Input 2–32 PV strings, 2–4 outputs
IP65
FRP / Stainless Enclosure −20 to +50°C operating range
Two Products, One Category
Simple. Effective. Economical.
SFB
String Fuse Box
Provides individual string-level overcurrent protection in a compact form factor — no DC isolation or surge protection. The most economical solution for fusing PV strings.
SFBD
String Fuse Box + Blocking Diode
Adds integrated blocking diodes to prevent reverse current flow into shaded or underperforming strings — critical for maintaining energy yield in large arrays.
Common Specifications — EPA-SFB & EPA-SFBD
Full Spec Sheet.
| Parameter | Value | Unit |
|---|---|---|
| Number of Input / Output | 2–32 / 2–4 | Nos. |
| Rated Voltage | 1500 | Vdc |
| Input / Output Cable Size | 6–25 | mm² |
| Enclosure / IP / Temp | FRP or SS / IP65 / −20 to +50°C | — |
| Overcurrent Protection | 1–630 | A |
| EPA-SFBD — Blocking Diode | Integrated reverse current protection per string | — |
| Standards | AS/NZS 3000, 5033, 61439-1/2, IEC 60269-6, IEC 62930, AS/NZS 5000.1 | — |
EPA-SFB & EPA-SFBD Enquiry
Get a Quote for These Products.
All Ampfusion combiner boxes are custom-engineered to project requirements. Talk to our technical team to begin your quotation.
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