Product Category
UHCCY DC fuses and fuse holders are designed for overcurrent and short-circuit protection in 1000V and 1500V photovoltaic DC systems. Available gPV fuse links and DIN-rail fuse holders support different current ratings, fuse sizes, pole configurations, and solar protection requirements.
Product Range
Browse available models here, then use the comparison table below to compare family-level specifications.
UH-DG-FU01
UH-DG-FH01
UH-DG-FU03
UH-DG-FU02
UH-DG-FH03
UH-DG-FH02
Overview
UHCCY DC fuses and fuse holders provide gPV overcurrent protection for 1000V and 1500V solar PV strings, combiner boxes, and inverter DC circuits.
Photovoltaic systems operate under continuous DC voltage and can experience reverse current, overcurrent, and short-circuit conditions that require protection specifically suited to DC circuits. Unlike AC current, DC current does not naturally pass through a zero-current point during each cycle, making arc interruption more demanding.
A correctly selected DC fuse provides a controlled interruption point when current exceeds the fuse-link operating characteristics. In photovoltaic installations, fuse protection is commonly used at string and array level to help prevent excessive current from damaging PV modules, conductors, combiner-box components, and other downstream equipment.
UHCCY DC fuse solutions cover both 1000V DC and 1500V DC photovoltaic systems, with fuse-link and fuse-holder configurations selected according to system voltage, current, fuse dimensions, and installation requirements.
A DC fuse assembly normally consists of two distinct components: the fuse link and the fuse holder.
The fuse link contains the element that operates when excessive current flows through the circuit. Once the fuse link has operated, it must be replaced.
The fuse holder provides the mechanical mounting, electrical connection, insulation, and replacement interface for the fuse link. DIN-rail fuse holders are commonly installed inside photovoltaic combiner boxes and DC distribution enclosures.
The electrical ratings of both components must therefore be considered together. A high-voltage fuse link should only be installed in a compatible holder with suitable DC voltage, current, insulation, and short-circuit characteristics.
Photovoltaic arrays have operating characteristics that differ from conventional AC distribution circuits. When multiple strings are connected in parallel, faulted strings can be exposed to reverse current supplied by the remaining strings.
PV fuse links classified for gPV applications are specifically intended for photovoltaic string and array protection.
IEC 60269-6 defines supplementary requirements for fuse-links used to protect photovoltaic strings and arrays at nominal circuit voltages up to 1500V DC.
The fuse rating must still be coordinated with the PV module manufacturer's maximum series fuse rating, conductor capacity, expected operating current, and prospective fault conditions.
1000V DC systems commonly use compact 10×38 mm fuse links and matching DIN-rail holders for PV string protection.
Higher-voltage 1500V photovoltaic installations require components specifically rated for the increased DC voltage. Depending on the product design, larger fuse formats such as 10×65 mm and 10×85 mm may be used to provide the necessary insulation distance and interruption capability.
A 1000V fuse or fuse holder must not be assumed suitable for a 1500V system. Every component in the protection assembly must have ratings appropriate for the maximum system voltage.
Key Advantages
Fuse links and fuse holders are available for common 1000V and 1500V photovoltaic system architectures.
PV-specific fuse links provide overcurrent protection for photovoltaic strings and arrays where gPV characteristics are required.
Supports common PV fuse formats including 10×38 mm, 10×65 mm, and 10×85 mm depending on voltage and current requirements.
Single-pole and double-pole configurations are available for different DC circuit and combiner-box designs.
Fuse holders are designed for compact installation in PV combiner boxes, DC distribution equipment, and related enclosures.
Selected fuse-holder configurations can be supplied with indication functions for easier identification of fuse operating status.
Model Selection
Compare the main family-level parameters, then open a model for its complete specifications and inquiry details.
| Model | Rated Voltage | Rated Current | Fuse Size | Pole | Wire Range |
|---|---|---|---|---|---|
| UH-DG-FU011000V DC gPV Fuse 10 × 38 mm for PV String Protection – UH-DG-FU01 | 1000V DC | 1 - 30A | 10 × 38 mm | ||
| UH-DG-FH011000V DC PV Fuse Holder for 10 × 38 mm Fuse – UH-DG-FH01 | 1000V DC | 1 - 32A | 10 × 38 mm | 1 - 4P | AWG 20-8 / 0.52-8.4 mm² |
| UH-DG-FU031500V DC gPV Fuse 10 × 65 mm, 1A–35A – UH-DG-FU03 | 1500V DC | 1 - 35A | 10 × 65 mm | ||
| UH-DG-FU021500V DC gPV Fuse 10 × 85 mm – UH-DG-FU02 | 1500V DC | 1 - 32A | 10 × 85 mm | ||
| UH-DG-FH031500V DC PV Fuse Holder for 10 × 65 mm Fuse – UH-DG-FH03 | 1500V DC | 1 - 35A | 10 × 65 mm | 1P | AWG 20-8 / 0.52-8.4 mm² |
| UH-DG-FH021500V DC PV Fuse Holder for 10 × 85 mm Fuse – UH-DG-FH02 | 1500V DC | 1 - 32A | 10 × 85 mm | 1P | AWG 20-8 / 0.52-8.4 mm² |
Technical Data
Family-wide ratings and shared technical ranges for preliminary selection.
| Parameter | Family Range / Value |
|---|---|
| Product Type | DC Fuse Holder / PV Fuse Link |
| Rated Voltage | 1000V DC / 1500V DC |
| Fuse Holder Rated Current | Up to 32A, model dependent |
| Fuse Link Rated Current | Approx. 1–35A, model dependent |
| Fuse Sizes | 10×38 mm / 10×65 mm / 10×85 mm |
| Fuse Utilization Category | gPV |
| Number of Poles | 1P / 2P |
| Fuse Holder Installation | DIN Rail |
| Protection Degree | IP20 for applicable fuse holders |
| Status Indicator | Optional on selected models |
| Fuse-Link Breaking Capacity | Up to 20kA, model dependent |
| Holder Conditional Short-Circuit Rating | Up to 20–25kA, model dependent |
| Applicable PV Fuse Standard | IEC 60269-6 |
| Application | Solar PV String / Array Protection |
Selection Guide
Select both the fuse link and fuse holder with rated DC voltages equal to or greater than the maximum voltage that can occur in the circuit.
Typical UHCCY configurations include:
For PV strings, maximum open-circuit voltage should also be evaluated under the minimum expected operating temperature.
Fuse current should be selected according to the PV module current characteristics, conductor capacity, expected continuous current, system configuration, and applicable design requirements.
The selected rating must not exceed the PV module manufacturer's specified maximum series fuse rating.
For photovoltaic string and array protection, select fuse links specifically intended for PV applications.
UHCCY PV fuse links are available in gPV configurations for this purpose.
Available fuse dimensions include:
The fuse link must physically and electrically match the selected fuse holder.
The rated breaking capacity of the fuse link must be adequate for the prospective fault current at the installation point.
Do not select a fuse based only on voltage and current ratings.
Choose according to:
Fuse protection should be coordinated with:
This ensures that individual components do not exceed their electrical or thermal ratings during normal operation or fault conditions.
Use Cases
Protect individual photovoltaic strings against excessive reverse current and overcurrent conditions in parallel-connected PV arrays.
Provide individual string or branch protection before multiple photovoltaic circuits are combined inside a DC combiner box.
Support coordinated overcurrent protection on the DC side of photovoltaic inverter systems.
Provide high-voltage DC fuse protection for larger 1000V and 1500V photovoltaic arrays.
Installation
Use DC fuse links and fuse holders only within their specified voltage, current, short-circuit, and environmental ratings.
Confirm that the fuse link dimensions and electrical ratings are compatible with the selected fuse holder before installation.
Install DIN-rail fuse holders securely inside a suitable electrical enclosure with adequate spacing and ventilation.
Verify conductor size, terminal preparation, and tightening requirements according to the specific fuse-holder datasheet.
For photovoltaic systems, confirm the PV module maximum series fuse rating before selecting the fuse-link current rating.
Do not install a 1000V-rated fuse or fuse holder in a circuit requiring a 1500V DC rating.
A fuse link that has operated must be replaced with a new fuse of the correct type, voltage rating, current rating, utilization category, dimensions, and breaking capacity.
Photovoltaic strings may remain energized whenever exposed to light. Appropriate DC isolation and electrical safety procedures must therefore be used before installation, inspection, or fuse replacement.
Compliance
| Type | Standard / Compliance | Scope |
|---|---|---|
| Applicable Standard | IEC 60269-1 | General requirements for low-voltage fuses |
| PV Fuse Standard | IEC 60269-6 | Supplementary requirements for fuse-links protecting PV strings and arrays |
| Environmental Compliance | RoHS | Subject to applicable product material documentation |
| Conformity | CE | Display only for models supported by a valid Declaration of Conformity |
FAQ
Common technical and purchasing questions about this product category.
A DC fuse is an overcurrent protection device designed to interrupt excessive current in a direct-current circuit. When current exceeds the fuse's operating characteristics, the fuse element opens the circuit to help protect conductors and connected equipment.
Interrupting DC current is different from interrupting AC current because a DC arc does not naturally pass through a zero-current point every cycle. A fuse used in a DC system therefore needs an appropriate DC voltage and breaking-capacity rating and should not be replaced with an AC-only fuse of similar current rating.
A gPV fuse is a fuse utilization category specifically intended for photovoltaic applications. It is designed for the electrical characteristics of PV strings and arrays and is commonly used for photovoltaic overcurrent protection.
Check the maximum system voltage, normal operating current, prospective fault current, conductor rating, equipment requirements, ambient conditions, and fuse-holder compatibility. PV applications should also consider the module manufacturer's maximum series fuse rating.
Not necessarily. Fuses and circuit breakers can both provide overcurrent protection, but their operating characteristics, switching functions, installation requirements, and reset behavior are different. A protection system may use one or both depending on the circuit design.
The fuse holder must be suitable for the selected fuse and for the electrical conditions of the circuit. Its DC voltage, current, insulation, terminal, and other applicable ratings should be verified rather than assuming that the fuse rating alone determines system capability.
Contact UHCCY for model selection, technical specifications, OEM/ODM requirements, samples, and quotations.
