PRNT Fuses: The Bayonet-Type Oil-Immersed Plug-In Fuse – Your Trusted High-Voltage Transformer Protector

Date: December 9, 2025

Transformers stand as the backbone of high-voltage power systems, so their safe, steady operation is pivotal to the entire distribution network’s reliability. Yet threats like overcurrent and short circuits persist as major risks—especially for oil-immersed transformers, which demand a fuse that balances strong adaptability and precise protection.

Drawing on decades of expertise in high-voltage electrical protection, Wenzhou Shuguang Fuse Co., Ltd. has unveiled the PRNT Fuses Box Transformer Oil-Immersed Plug-In Fuse. Tailored specifically for oil-immersed transformer safety, this core product leverages a distinct Bayonet Type Fuses structure and Double Sensitive Fuses design to deliver all-around protection for power systems.

I. How PRNT Fuses Work & Their Core Design

The PRNT Fuses uses a tried-and-true bayonet-type twist-lock mechanism—intuitive to operate, much like common industrial connectors—for secure, stable performance. Its design centers on three key components: the fuse carrier, insulating base, and precision mechanical contacts, with a straightforward, efficient workflow:

Insert the fuse into its matching base, then give it a quarter-turn to align with the slot;

A built-in spring-loaded system locks the fuse in place, ensuring tight contact and consistent electrical connectivity;

Under normal conditions, the fuse keeps the circuit active. At the first sign of overcurrent or short circuit, it triggers quickly to cut the circuit, containing faults before they reach the transformer itself.

The Double Sensitive Fuses design is a standout feature here: it detects even minor abnormal current fluctuations, combining fast fault response with overload protection to significantly boost oil-immersed transformer safety.

II. Key Advantages & Features of PRNT Fuses

As a flagship offering from Wenzhou Shuguang, the PRNT Fuses sets itself apart with strong performance and versatility. Its main benefits include:

Engineered for Oil immersed Transformers Protection: The oil-sealed structure withstands impulse voltages up to 150 kV, working seamlessly with 8.3 kV to 34.5 kV high-voltage systems;

Durable build: High-strength insulation materials pair with a PVC Material Blade Fuses Holder for excellent insulation, resistance to aging, and corrosion—ideal for outdoor or harsh industrial settings;

User-friendly maintenance: The bayonet plug-in design lets teams replace fuses quickly (no special tools needed), and compatibility with insulated operating rods adds an extra layer of safety for on-site work;

Flexible compatibility: It works with QS-708 Fuses specifications, so it can adapt to different transformer models for diverse project needs.

Compared to traditional non-loadbreak fuses, the PRNT Fuses addresses longstanding pain points (slow response, tricky maintenance, poor adaptability) with faster reaction times, better sealing, and broader compatibility.

III. Where PRNT Fuses Excel

Thanks to its reliable protection and consistent performance, the PRNT Fuses is widely used across high-voltage distribution scenarios, including:

Box-type transformers: Acts as the first line of defense for oil-immersed box transformers, shielding windings from fault currents;

Underground distribution hubs: Prevents overcurrent in looped underground systems, handling the humid, enclosed environment with ease;

Medium-voltage switchgear (up to 38 kV): Integrates smoothly with high-voltage bushings and compartments to enable clear circuit isolation and secondary protection;

Public power grids: Delivers fast protection for 11 kV/22 kV transformers, letting line workers perform efficient, safe maintenance;

Industrial & rail transit power: Supports high-voltage equipment in mines, factories, and electrified railways, maintaining stability in tough operating conditions.

IV. Wenzhou Shuguang: Your Partner in High-Voltage Protection

Wenzhou Shuguang Fuse Co., Ltd. is committed to crafting dependable power protection solutions. With years of R&D and manufacturing experience in high-voltage fuses, our products meet strict international electrical standards and pass rigorous quality checks.

The PRNT Fuses is a benchmark for Oil immersed Transformers Protection: its Double Sensitive Fuses technology and Bayonet Type Fuses design have made it a top choice for power engineering and transformer manufacturers. Suitable for 50 Hz AC systems, it covers mainstream medium/high-voltage ratings and matches transformer power needs precisely—providing end-to-end protection from design to daily operation.

V. Conclusion

As the power industry shifts toward efficiency, safety, and smart operation, Wenzhou Shuguang’s PRNT Fuses (Bayonet-Type Oil-Immersed Plug-In Fuse) redefines high-voltage transformer protection. Its oil-immersed design, easy operation, and steady performance set a new standard for reliability.

Whether deployed in public grids, industrial facilities, or new energy projects, the PRNT Fuses uses its bayonet-type advantages to block overcurrent faults and cut downtime—keeping power systems safe and stable. Wenzhou Shuguang will continue innovating to deliver high-quality high-voltage protection solutions to customers worldwide.