How to Select Drop-Out Fuses Correctly?｜Weicite Power Tech's Expert Guide

                                                                                                                                                                          Cost-Effective 11kV Fuse Cutout, Rural Grids, 10-Year Warranty  

Selecting the right High Voltage Drop-out Fuse is critical for transformer protection. Shandong Weichite Power Technology Co., Ltd. reveals key steps based on IEC/ANSI standards:   

1. Voltage & Current Matching: Non-Negotiable!  

Rated Voltage: Fuse voltage rating MUST match transformer system voltage (e.g., 11kV, 33kV).  

Fuse Link Sizing: Apply the 1.5~2x Rule:  

  ✅ Fuse Base Rating ≥ Fuse Link Rating  

  ✅ Fuse Link Current = (1.5~2) × Transformer Full Load Current  

  Example: 100kVA 11kV transformer (FLA=5.25A) → Select 8-10A fuse link

   2.Short-Circuit Capacity Verification 

Validate interrupting capacity using:  

System 3-Phase Fault Current < Fuse Breaking Capacity Upper Limit  

Warning: Exceeding the limit risks catastrophic failure! For industrial users, Weicite recommends fuses with ≥16kA breaking capacity.  

3. Model Selection: Beyond Basic Specs 

Dynamic Tripping Curve**: Withstand transformer inrush current (20-25× FLA for 0.1s)  

Environment Adaptation**: -40℃ versions available with silicone seals  

Corrosion Resistance**: C5-M coating for coastal/chemical plants  

Why Choose Weichite? 

▶ Smart Selector Tool: Get model recommendations (e.g., Type-HV-12/100) in 30s  

▶ Full-Range Solutions: From pole-mounted transformers (50kVA) to substations (2.5MVA)  

▶ Global Compliance: KEMA-tested fuse links meeting IEC 60282-1  

 Case Study: A steel plant avoided $50k downtime by upgrading to 20kA fuses after fault current analysis.  

Free Resource: Download Weicite’s 《Drop-Out Fuse Selection Checklist》 or WhatsApp +86-18766879995 for instant technical support!