PRNT Fuses: Bayonet-Type Oil-Immersed Plug-In Fuses – Your Go-To High-Voltage Transformer Guardian

Date: December 9, 2025

Transformers are the cornerstone of high-voltage power systems; their safe, consistent operation is the bedrock of a reliable distribution network. Yet issues like overcurrent and short circuits remain persistent threats—particularly for oil-immersed transformers, which require a fuse that blends robust adaptability with pinpoint protection.

Boasting years of expertise in high-voltage electrical safety, Wenzhou Shuguang Fuse Co., Ltd. has rolled out the PRNT Fuses Box Transformer Oil-Immersed Plug-In Fuse. Built exclusively to safeguard oil-immersed transformers, this flagship product leverages a distinct Bayonet Type Fuses structure and Double Sensitive Fuses design to deliver full-spectrum protection for power systems.

I. PRNT Fuses: How They Operate & Core Components

The PRNT Fuses uses a time-tested bayonet twist-lock mechanism—intuitive to use, much like standard industrial connectors—for secure, steady performance. Its design centers on three key parts: the fuse carrier, insulating base, and precision mechanical contacts, with a straightforward, efficient workflow:

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

A built-in spring-loaded system locks the fuse firmly 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 rapidly to cut the circuit, containing faults before they reach the transformer itself.

A standout feature is the Double Sensitive Fuses design: it detects even minor abnormal current fluctuations, merging fast fault response with overload protection to sharply boost the safety of oil-immersed transformers.

II. Key Strengths & Features of PRNT Fuses

As a flagship offering from Wenzhou Shuguang, the PRNT Fuses stands out for its performance and versatility. Its main advantages include:

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

Durable construction: High-strength insulation materials pair with a PVC Material Blade Fuses Holderfor top-tier insulation, aging resistance, and corrosion tolerance—perfect for outdoor or harsh industrial settings;

Easy maintenance: The bayonet plug-in design lets teams swap 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 adapts easily to different transformer models for varied project needs.

Compared to traditional non-loadbreak fuses, the PRNT Fuses fixes long-standing pain points (slow response, tricky upkeep, poor fit) with faster reaction times, better sealing, and broader adaptability.

III. Where PRNT Fuses Shine

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

Box-type transformers: Acts as the first safety line for oil-immersed box transformers, shielding windings from damaging 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, staying stable in tough operating conditions.

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

Wenzhou Shuguang Fuse Co., Ltd. is dedicated 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 pick 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 for oil-immersed transformers from design to daily use.

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 standards. Its oil-immersed design, easy operation, and steady performance set a new bar for reliability.

Whether used 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 keep innovating to deliver higher-quality high-voltage protection solutions to customers worldwide.