SWR-30 DC Fuse Holder

The SWR‑30 DC Fuse Holder is a 10×38 mm photovoltaic fuse holder designed for protecting DC strings in solar PV systems. It interrupts low overcurrents caused by reverse current and multi‑array faults, ensuring safe operation of PV panels, inverters, and DC combiner boxes. 




T‍echnical Parameter

1.A range of 10x38mm fuse links specifically designed for protecting photovoltaic strings. These fuse links are capable of interrupting low overcurrents associated with faulted photovoltaic string arrays (reverse current, multi-array fault).

2.DC fuse holder mainly used in DC combiner box in solar PV systems. When PV panel or imverter caused overload or short circuit, it trip off immediately, to protect PV panels, DC fuse holder aslo used to protect other electrical parts in DC circuit, when overload or short circuit.

Application Scenarios

• PV String Protection  Prevents reverse current between parallel PV arrays and isolates faulted strings.

• DC Combiner Box Integration  Provides overcurrent protection before DC output enters the inverter.

• Inverter Input Protection  Interrupts short circuits caused by panel faults or inverter backfeed.

• General DC Circuit Protection  Suitable for battery systems, DC distribution panels, and low‑voltage DC equipment.
  

  
  

Company Introduction
Singi Electrical is a professional manufacturer of low‑voltage electrical protection devices, specializing in photovoltaic components such as DC MCBs, MCCBs, fuse holders, and distribution boxes. The company focuses on high‑reliability engineering, international compliance, and large‑scale production for global solar energy markets.

FAQ

Q1: Why does a photovoltaic system require a DC‑specific fuse holder instead of a standard AC fuse holder?

A: DC arcs are continuous and harder to extinguish than AC arcs. The SWR‑30 is engineered to interrupt low overcurrents and reverse currents in PV strings, which standard AC fuse holders cannot reliably handle.

Q2: What types of PV faults can the SWR‑30 fuse holder interrupt?

A: It can interrupt reverse current between parallel PV arrays and multi‑array faults caused by uneven irradiance or string mismatch. These faults can damage panels and inverters if not isolated quickly.

Q3: Why is the 10×38 mm fuse link format commonly used in solar DC protection?

A: The 10×38 mm format provides a compact size while supporting high breaking capacity (25 kA), making it suitable for high‑voltage PV applications where space and reliability are critical.

Q4: How does the SWR‑30 improve safety inside a DC combiner box?

A: It isolates faulted strings before they propagate to the main DC bus, preventing thermal damage, inverter shutdowns, and system‑wide failures.

Q5: Can the SWR‑30 be used in non‑PV DC circuits?

A: Yes. Although optimized for PV systems, it can protect any DC circuit requiring high‑voltage overcurrent protection, such as battery banks or DC distribution panels.