

The SPF Solar Protection Fuse series has been specifically designed for the protection of photovoltaic (PV) systems. This family of Midget style fuses (10x38 mm) can safely protect PV (photovoltaic) modules and conductors from reverse overcurrent conditions.
As PV systems have grown in size, so have the corresponding voltage requirements. This increase in system voltage has typically been intended to minimize power loss associated with long conductor runs. Standard circuit protection devices are not designed to completely protect photovoltaic panels. However, the SPF series is UL Listed to safely interrupt faulted circuits up to this demanding voltage level.
Littelfuse offers 14 ampere ratings to match specific requirements in a variety of applications.
- Full range, fast-acting fuse helps eliminate common lowoverload faults.
- Prevents power generation losses due to nuisance tripping from changes in temperature
- Both PCB mount and dead-front holder options available
- Full range, fast-acting fuse helps eliminate common lowoverload faults.
- Prevents power generation losses due to nuisance tripping from changes in temperature
- Both PCB mount and dead-front holder options available
SPF Parts
Filters
Part Number | Actions | Current Rating (Continuous) in Amps | Interrupting Rating | Opening | Voltage Rating (V) | Size | Agency Approvals |
---|
Part Number | Actions | Current Rating (Continuous) in Amps | Interrupting Rating
| Opening | Voltage Rating (V) | Size | Agency Approvals | |
---|---|---|---|---|---|---|---|---|
1 | 20 kA | Fast-Acting (F) | 1000 | Midget | CE / cUL / TUV / UL / CSA | |||
Midget | TUV | |||||||
1 | 20 kA | Fast-Acting (F) | 1000 | Midget | CE / TUV / cUL / UL / CSA | |||
2 | 20 kA | Fast-Acting (F) | 1000 | Midget | CE / TUV / UL / cUL / CSA | |||
Midget | TUV | |||||||
2 | 20 kA | Fast-Acting (F) | 1000 | Midget | TUV / cUL / CE / UL / CSA | |||
3 | 20 kA | Fast-Acting (F) | 1000 | Midget | TUV / CE / UL / cUL / CSA | |||
3 | 20 kA | Fast-Acting (F) | 1000 | Midget | cUL / TUV / UL / CE / CSA | |||
4 | 20 kA | Fast-Acting (F) | 1000 | Midget | CE / TUV / cUL / CSA / UL | |||
4 | 20 kA | Fast-Acting (F) | 1000 | Midget | UL / TUV / cUL / CSA / CE | |||
5 | 20 kA | Fast-Acting (F) | 1000 | Midget | TUV / CE / CSA / UL / cUL | |||
Midget | TUV |
SPF Applications
- Inverters
- Combiner boxes
- Battery charge controllers
- Test Application
Series: SPF Resources

Solar Product Catalog
Use this catalog to find high-voltage fuses, surge protection solutions, protection relays, and switches optimized for use in solar applications.

Littelfuse Solar Products Catalog
Find fuses, TVS diodes, protection relays, varistors, and IGBT power modules for solar energy applications.

Solar Product Line Card - Mandarin
Chinese readers can find fuses, mechanical switches, and ground fault protection solutions for solar arrays, inverters, combiners, and

Solar Product Line Card
Find fuses, mechanical switches, and ground fault protection solutions Littelfuse engineered specifically for solar power applications.

Solar Product Line Card - Spanish
Spanish readers can find fuses, mechanical switches, and ground fault protection solutions for solar arrays, inverters, combiners, and