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DC Fuse Holders for Solar PV Applications | 1000V DC | 10×38 to 22×58mm Fuse Links
Reliable fuse mounting and isolation solution for photovoltaic systems
KRIPAL UKRT18-PV series fuse holders are designed for photovoltaic (PV) applications, providing safe installation, connection, and isolation for cylindrical PV fuse links. Supporting fuse link sizes from 10×38mm to 22×58mm, the series is suitable for PV string protection in solar combiner boxes and DC distribution systems. With a rated working voltage up to 1000V DC and a conventional thermal current up to 80A, these fuse holders are compatible with gPV (photovoltaic dedicated) fuse links according to IEC 60269-6 and GB/T 13539.6 requirements. The UKRT18-PV series features a compact modular design, 35mm DIN-rail mounting capability, and optional fuse indicator lights for quick fault identification. It provides reliable support, short-circuit protection (up to 100kA), and power isolation for PV fuses in renewable energy applications.
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UKRT18PV DC Fuse Holder 1000V 32A 1P 2P for 10x38mm Fuse CE Certified
The Kripal UKRT18PV is a reliable DC Fuse Holder rated at 32A 1000V. Available in 1P/2P for 10x38mm fuses.
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UKRT18PV DC Fuse Holder 1000V 63A 3Pole for 14*51mm Fuse CE Certified
Kripal UKRT18PV is a 3 Pole 63A holder for 14x51mm links. Designed for 1000V DC FUSE applications.
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UKRT18PV DC Fuse Holder 1000V 125A 2P for 22*58 Fuse PV Solar CE Certified
Kripal UKRT18PV is a 2P 125A dc fuse holder 1000v for 22x58mm links. It ensures superior protection for solar PV applications.
Ask a QuoteDC Fuse Selection Guide for Photovoltaic String Protection
A DC fuse provides sacrificial overcurrent protection by melting a calibrated metal element when current exceeds the fuse’s rated value for a defined duration. In PV systems, these fuses are essential within string combiner boxes to protect individual strings against reverse currents from parallel healthy strings. While DC circuit breakers offer a resettable mechanism, a fuse serves as a reliable “one-shot” device that must be physically replaced after clearing a fault. Despite this, their lower cost, higher DC breaking capacity, and immunity to mechanical wear make them the preferred protection solution at the string level for large-scale PV arrays. This selection guide outlines the critical parameters for choosing the right fuse, including current rating, voltage rating, breaking capacity, and mounting configuration.
UKRT18PV DC Fuse Series Technical Specifications
gPV Fuse-Link Current Rating Selection
The gPV fuse rating should be selected based on the PV string short-circuit current (Isc), typically at least 1.25 times the string Isc to prevent nuisance operation under high irradiance conditions.For example, a PV string with an Isc of 11A commonly uses a 16A or 20A gPV fuse, depending on system design requirements, module specifications, and cable protection needs.In multi-string PV systems, the fuse must also safely interrupt reverse fault currents supplied by parallel strings and clear faults before cable thermal limits are exceeded. KRIPAL gPV fuse-links provide reliable overcurrent protection for residential, commercial, and utility-scale solar applications.
DC Voltage Rating and System Compatibility
UKRT18PV gPV fuse-links are rated up to 1000V DC and are designed for reliable overcurrent protection in photovoltaic systems up to 1000V DC.The fuse voltage rating must be equal to or higher than the maximum PV system voltage to ensure safe fault interruption. Proper selection should consider the array open-circuit voltage (Voc), temperature conditions, and system design requirements.Featuring a non-polarized design, UKRT18PV fuse-links allow flexible installation in either direction while providing reliable DC fault protection for solar PV applications.
Fuse Base and Blown-Fuse Indication Options
UKRT18PV fuse bases are available with flexible connection options to meet different PV combiner box installation requirements, including screw clamp, box lug, and busbar mounting configurations.Integrated blown-fuse indication allows fast identification of failed fuse-links during maintenance. An optional microswitch version provides remote fuse status monitoring for intelligent PV systems and centralized operation platforms.
Fuse Coordination with Upstream DC MCCBs
In PV protection systems, UKRT18PV gPV fuse-links can be coordinated with upstream UKM7Z DC MCCBs to provide selective protection.During string-level faults, the fuse operates first to isolate the affected PV string, while the upstream MCCB remains closed to maintain power generation from healthy strings.KRIPAL provides coordination data to help engineers achieve reliable protection performance and minimize unnecessary system shutdowns in solar PV installations.
Specify DC Fuses for Your PV Combiner Box
- Fuse Sizing Calculator: Submit your string Isc, number of parallel strings and cable size, and we provide the recommended UKRT18PV fuse rating with coordination verification.
- Time-Current Curves: Request I²t and peak let-through curves in electronic format for your protection coordination study software.
- Combiner Box Design Support: Need help laying out fuse supports in your combiner box enclosure? Request our 3D design support for your configuration.
Cost-Effective String Protection for PV Installations Worldwide
KRIPAL UKRT18PV DC fuse supports and compatible fuse links provide reliable overcurrent protection for photovoltaic systems, ranging from residential combiner boxes to utility-scale solar farms. Designed with the gPV utilization category, these products are optimized for DC photovoltaic fault conditions that standard gG fuses cannot safely interrupt. The series ensures fast fault clearance, reduced downtime, and cost-effective system protection.
PV String Combiner Box Protection
In 8–24 string PV combiner boxes, each PV string is protected by a gPV fuse-link, typically selected at 1.25 × Isc. During string faults, healthy strings may feed reverse current into the faulty string. The fuse quickly isolates the fault, protecting PV cables and DC components. Unlike standard gG fuses, UKRT18-PV gPV fuse-links are specifically designed for photovoltaic systems, ensuring reliable DC fault interruption under low-overcurrent conditions.
Inverter DC Input Protection
In 500 kW–2 MW central inverters, UKRT18PV series fuses protect DC input circuits against severe faults. With a dynamic and thermal stability capability of up to 100kA, the fuse assembly quickly interrupts high-energy fault currents, limiting let-through energy and protecting power semiconductor devices. Fuse status monitoring can be integrated into inverter control systems to trigger protection actions and prevent operation under fault conditions.
Battery Energy Storage Protection
In lithium-ion battery systems, DC fuses help protect battery circuits against high-energy faults such as internal short circuits. High fault currents in low-voltage battery systems can generate significant thermal stress, requiring fast and reliable fault interruption.The fuse’s low I²t let-through helps reduce fault energy and protect connected components. Its non-polarized design enables reliable operation in DC systems with bidirectional current flow during charging and discharging.
DC Distribution & Industrial Applications
In low-voltage DC distribution systems, UKRT18PV fuses protect branch circuits supplying critical loads such as control systems and industrial equipment. They provide reliable protection against overload currents and short-circuit faults, while the integrated indicator light enables quick fault identification in high-density DC panels.
Solar Water Pumping Systems
In off-grid PV pumping systems, UKRT18-PV fuses protect DC circuits, controllers, and connected equipment against overcurrent faults. They are designed to withstand normal startup currents while providing fast fault isolation during abnormal conditions. 35mm DIN-rail mountable fuse bases and visual indicators simplify installation and field maintenance.
Protect Your PV Strings with gPV Fuse-Links
- Fuse Coordination Report: Submit your combiner box single-line diagram for a full selectivity study showing UKRT18PV fuses coordinated with upstream MCCBs.
- IEC 60269-6 Compliance Package: Obtain gPV type-test certificates and pre-arcing I²t data for your project technical due diligence.
- Bulk Fuse-Link Supply: Order UKRT18-PV fuse-links in bulk packs with your combiner box production volumes for just-in-time delivery to your assembly line.
KRIPAL DC Fuse Manufacturing: Precision Elements for Predictable Protection
KRIPAL UKRT18PV fuses and supports are manufactured through controlled processes using precision-formed silver alloy elements and high-purity quartz sand filling to ensure reliable arc-quenching performance. Ceramic bodies and end-cap assemblies are produced with controlled joining processes to maintain mechanical strength and electrical reliability. Each production batch undergoes rigorous quality inspection, and performance testing is conducted in accordance with applicable IEC standards.
Precision-Stamped Silver Fuse Elements
Silver alloy elements are precision-stamped using controlled tooling processes, with tight dimensional control on reduced-section areas that define melting characteristics. Element geometry is verified during tooling setup to ensure consistent gPV time-current performance and reliable fault interruption.
Quartz Sand Filler Compaction Process
High-purity quartz sand with controlled grain size distribution is compacted around the fuse element under precision vibration. The compaction density is verified to confirm uniform filling, which determines arc-quenching performance during DC interruption.
DC Breaking Capacity Testing Per Production Batch
Sample fuses from each production lot are verified for performance consistency. The UKRT18PV series is designed with the ability to withstand dynamic and thermal stability against expected short-circuit impact currents up to 100kA at 1000V DC.
End-Cap Crimping and Ceramic Body Sealing
Silver-plated copper end caps are crimped onto ceramic bodies under controlled pressure. Epoxy resin sealing is cured under temperature-controlled conditions, and each completed unit undergoes a continuity test and visual inspection for seal integrity.
Distributor Stock Holding Programs for DC Fuses
KRIPAL supports distributor inventory programs by aligning agreed stock levels with standard UKRT18PV models. Shipments are planned based on demand forecasts to ensure continuous product availability and efficient replenishment cycles.
Private Label and OEM Branding for DC Fuses
KRIPAL offers OEM and private label solutions for DC fuses, including laser-marked part numbers, customized branding on packaging, and multilingual instruction materials. Both branded and unbranded supply options are available.
Multi-Region Certification and Compliance Support
KRIPAL UKRT18PV fuses are designed according to international standards, including GB13539.1, GB/T13539.6, IEC 60269-1, and IEC 60269-6. CE declarations are provided to support regional market access. Technical documentation is maintained to ensure alignment with these standards and support PV system design verification.
Direct Technical Access to KRIPAL Production Engineers
KRIPAL provides direct technical support from engineers involved in the design and validation of our fuse products. Application-related questions are handled by our engineering team, ensuring accurate guidance for system integration and protection coordination. Response times are typically within 24 hours during China business hours.
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