Date: December 9, 2025

In high-voltage power systems, transformers serve as core equipment, and their safe and stable operation is directly related to the reliability of the entire power distribution network. However, circuit faults such as overcurrent and short circuits have always been major hidden dangers threatening transformer safety. Especially for oil-immersed transformers, a fuse with strong adaptability and precise protection is crucial.

With years of experience in the high-voltage electrical protection field, Wenzhou Shuguang Fuse Co., Ltd. has launched the PRNT Fuses Box Transformer Oil-immersed Plug-in Fuse—a core product developed specifically for the protection needs of oil-immersed transformers. Featuring a unique Bayonet Type Fuses structure and Double Sensitive Fuses design, it provides comprehensive safety guarantees for power systems.

I. Working Principle and Core Structure of PRNT Fuses

The PRNT Fuses adopts a classic Bayonet Type Fuses twist-lock mechanism, with an operation logic similar to common industrial connectors—convenient and stable. Its core structure consists of three key components: fuse carrier, insulating base, and precision mechanical contacts, with a clear and efficient working process:

Insert the fuse main body into the matching base and rotate a quarter turn after aligning with the card slot;

Achieve mechanical locking through the built-in spring-loaded structure to ensure tight fit between the fuse and the base, forming stable electrical contact;

Maintain circuit conduction under normal operating conditions. When faults such as overcurrent or short circuit occur, the fuse responds quickly to cut off the circuit, preventing fault spread to the transformer itself.

The product specially adopts a Double Sensitive Fuses design, which can accurately capture tiny abnormal current changes in the circuit, combining both fast fusing and overload protection functions to greatly improve the operational safety of oil-immersed transformers.

II. Core Advantages and Product Features of PRNT Fuses

As a flagship product of Wenzhou Shuguang Fuse Co., Ltd., the PRNT Fuses excels in performance and adaptability, with the following core advantages:

Professionally designed for Oil immersed Transformers Protection, featuring an oil-immersed sealed structure that can withstand impulse voltages up to 150 kV, compatible with various high-voltage systems ranging from 8.3 kV to 34.5 kV;

The main body adopts a combined design of high-strength insulating materials and PVC Material Blade Fuses Holder, offering excellent insulation performance, aging resistance, and corrosion resistance, suitable for outdoor and harsh industrial environments;

Bayonet Type Fuses plug-in structure combined with field-maintainable design allows quick replacement without complex tools. When used with insulated operating rods, it further enhances operation and maintenance safety and efficiency;

Compatible with QS-708 Fuses series specifications, can be flexibly adapted to different transformer models to meet diverse engineering needs.

Compared with traditional non-loadbreak fuses, the PRNT Fuses has achieved upgrades in response speed, sealing performance, and adaptability, completely solving the pain points of "slow response, difficult maintenance, and poor adaptability" in oil-immersed transformer protection.

III. Core Application Scenarios of PRNT Fuses

With precise protection performance and stable operational performance, the PRNT Fuses has been widely used in various high-voltage power distribution scenarios, especially suitable for:

Box-type transformers: As a core protection component, it provides the first safety barrier for oil-immersed box-type transformers, preventing fault currents from damaging transformer windings;

Underground power distribution centers: Plays an overcurrent protection role in looped power distribution systems, adapting to the special underground environment with high humidity and airtightness;

Medium-voltage switchgear (up to 38 kV): Seamlessly integrates with high-voltage bushings and compartments to achieve clear circuit isolation and secondary protection;

Public power distribution networks: Provides fast protection at the medium and high-voltage transformer level (such as 11 kV/22 kV systems), supporting efficient operation and maintenance by line workers;

Industrial and rail transit power distribution: Adapts to high-voltage equipment in mines, factories, and electrified railways, maintaining stable performance under harsh working conditions.

IV. Wenzhou Shuguang: Focus on High-Voltage Protection, Quality You Can Trust

Wenzhou Shuguang Fuse Co., Ltd. has always taken "creating reliable power protection equipment" as its core mission. With years of experience in R&D and production of high-voltage fuses, the company's products strictly comply with international electrical standards and have passed multiple quality inspections.

The newly launched PRNT Fuses is not only a benchmark product in the field of Oil immersed Transformers Protection but also, with its Double Sensitive Fuses technology and Bayonet Type Fuses structure design, has become the preferred cooperation solution for many power engineering and transformer manufacturing enterprises. The product is suitable for 50 Hz AC power systems, with rated voltages covering mainstream medium and high-voltage specifications, and rated currents accurately matching the needs of transformers of different powers, providing full-cycle protection for oil-immersed transformers from design to operation and maintenance.

V. Conclusion

Against the backdrop of the power industry's transformation towards efficiency, safety, and intelligence, the PRNT Fuses Bayonet Type Oil-immersed Plug-in Fuse from Wenzhou Shuguang Fuse Co., Ltd. has redefined the standards for high-voltage transformer protection with its professional oil-immersed protection design, convenient operation experience, and stable performance.

Whether applied in public power distribution networks, industrial infrastructure, or new energy supporting projects, the PRNT Fuses can effectively resist overcurrent faults and minimize downtime losses by virtue of the unique advantages of Bayonet Type Fuses, safeguarding the safe and stable operation of power systems. Wenzhou Shuguang Fuse Co., Ltd. will continue to deepen technological innovation and provide global customers with more high-quality high-voltage electrical protection solutions.