QSA Series Fuse Knife Switch 63‑1250A 3P
QSA Series Fuse Knife Switch 63‑1250A 3P
QSA series fuse‑type manual knife switch is cabinet‑mount heavy‑current load‑break isolator, covering rated current 63A up to 1250A for 3‑pole low‑voltage power systems. Built‑in fuse holders provide short‑circuit and over‑current backup protection. Silver‑plated copper knife contacts ensure low contact resistance and reliable heavy‑current performance. Open‑style contact structure enables visual ON/OFF status inspection. Widely fitted in main power cabinets, workshop switchgear and infrastructure power transformation. Support bulk order, OEM branding and project‑specific custom solutions for panel builders and power contractors.
QSA series fuse‑type manual knife switch is cabinet‑mount heavy‑current load‑break isolator, covering rated current 63A up to 1250A for 3‑pole low‑voltage power systems. Built‑in fuse holders provide short‑circuit and over‑current backup protection. Silver‑plated copper knife contacts ensure low contact resistance and reliable heavy‑current performance. Open‑style contact structure enables visual ON/OFF status inspection. Widely fitted in main power cabinets, workshop switchgear and infrastructure power transformation. Support bulk order, OEM branding and project‑specific custom solutions for panel builders and power contractors.
Product Overview
Key Product Features
✅ Wide Current Range 63A‑1250A
Complete current grades from 63A,100A,160A,250A,400A,630A,800A,1000A up to 1250A. One product series covers small workshop to large‑scale industrial main‑circuit requirements.
✅ Built‑in Fuse‑Holder Dual‑Protection Design
Each pole is equipped with standard fuse installation cavity. Install compatible fuses to realize fast short‑circuit & over‑current fault cutoff. Realize switching and protection in one unit, save valuable cabinet installation space.
✅ Silver‑Plated Thick Copper Knife Contacts
High‑quality silver‑plated copper contact assembly. Ultra‑low contact resistance, excellent arc‑suppression capability, resist contact burning under long‑term heavy‑current operation and frequent switching cycles.
✅ Visual Open‑Style Contact Structure
Exposed knife‑type contacts. Maintenance staff can directly observe physical contact status, avoid mis‑judgment of power state and greatly improve onsite operation safety.
✅ Front‑Cabinet Manual Operating Handle
External front‑mount operation handle with clear ON‑OFF marking. Stable mechanical interlock mechanism prevents mis‑operation. Simple and reliable mechanical action for heavy‑current working conditions.
✅ Flame‑Retardant High‑Strength Insulating Base
Heat‑resistant anti‑aging insulating material, outstanding dielectric strength, stable performance under dusty, high‑temperature harsh industrial environment.
✅ Heavy‑Duty Terminal & Cabinet‑Fixed Mounting
Thick copper bus‑bar terminals for heavy‑current wiring. Firm cabinet fixing brackets, convenient for assembling inside various standard industrial power cabinets.
Technical Specifications
| Item | Parameter |
|---|---|
| Product Series | QSA Fuse‑type Manual Knife Switch |
| Poles | 3P |
| Rated Current | 63A ~ 1250A |
| Rated Operational Voltage | AC 400V 50Hz |
| Operation Mode | Manual cabinet‑front handle operation |
| Protection | Manual isolation + Fuse short‑circuit / over‑current protection (fuses not included) |
| Contact Material | Silver‑plated copper knife contacts |
| Housing Base | Heat‑resistant flame‑retardant insulation |
| Installation | Cabinet fixed mounting |
| Application | Industrial main power cabinet, mining, construction, infrastructure power distribution |
Application Scenarios
- Main circuit manual isolation for large‑scale factory heavy‑duty power cabinets
- Workshop power cut‑off for equipment overhaul and routine maintenance
- Mining site, construction site heavy‑load temporary power distribution switchgear
- Infrastructure and industrial park power transformation projects
- Large mechanical equipment main power disconnection point
- Commercial complex heavy‑load power distribution cabinet systems
Our Advantages
Full‑range 63‑1250A complete specifications
Full stock covering 63A‑1250A. Support mixed container orders for switch‑panel manufacturers, fast bulk shipment available.
Industrial‑grade heavy‑current production standard
All conductive components adopt thick copper with silver‑plated treatment. Optimized arc‑quenching structure, specially designed for long‑term heavy‑load industrial working conditions.
Multi‑step strict factory testing
Each unit passes contact resistance test, high‑voltage withstand test and mechanical life test before leaving factory, reduce over‑heating and insulation failure risks.
Rich heavy‑current power‑project experience
Our engineering team is familiar with cabinet‑building pain‑points for high‑current projects, provide professional selection guidance instead of simple product supply.
Comprehensive technical document support
Supply CAD dimension drawings, wiring diagrams, datasheets and test documents for tender bidding and project review. Fast‑response overseas technical support.
Custom Solution
- OEM Brand Customization: Print private brand logo, custom model marking on handle and housing for branded resale.
- Special‑spec adaptation: Custom terminal structure and mounting dimension for non‑standard power cabinet requirements.
- Export‑grade custom packing: Neutral carton, customer‑branded carton, seaworthy reinforced packing for long‑distance sea shipment.
- Project‑level technical file service: CAD drawings, wiring schematics, test reports for bidding submission and local project approval.
- Large‑volume project priority production: Arrange priority production schedule for large infrastructure orders.
Contact our sales team, share your cabinet drawing or project technical parameters, we will deliver targeted technical proposal within 24 working hours.
FAQ
Q1: Are fuses included with QSA knife switch?
Q2: What current sizes are available for QSA series?
Q3: What is the key difference between QSA knife switch and ordinary load isolator switch?
Q4: Can QSA series switch break load current?
Q5: Can QSA be used for construction site power cabinets?
Q6: Do you support OEM private‑label service for distributors?
Q7: What documents can you provide for import clearance and bidding?
Product Overview
Key Product Features
✅ Wide Current Range 63A‑1250A
Complete current grades from 63A,100A,160A,250A,400A,630A,800A,1000A up to 1250A. One product series covers small workshop to large‑scale industrial main‑circuit requirements.
✅ Built‑in Fuse‑Holder Dual‑Protection Design
Each pole is equipped with standard fuse installation cavity. Install compatible fuses to realize fast short‑circuit & over‑current fault cutoff. Realize switching and protection in one unit, save valuable cabinet installation space.
✅ Silver‑Plated Thick Copper Knife Contacts
High‑quality silver‑plated copper contact assembly. Ultra‑low contact resistance, excellent arc‑suppression capability, resist contact burning under long‑term heavy‑current operation and frequent switching cycles.
✅ Visual Open‑Style Contact Structure
Exposed knife‑type contacts. Maintenance staff can directly observe physical contact status, avoid mis‑judgment of power state and greatly improve onsite operation safety.
✅ Front‑Cabinet Manual Operating Handle
External front‑mount operation handle with clear ON‑OFF marking. Stable mechanical interlock mechanism prevents mis‑operation. Simple and reliable mechanical action for heavy‑current working conditions.
✅ Flame‑Retardant High‑Strength Insulating Base
Heat‑resistant anti‑aging insulating material, outstanding dielectric strength, stable performance under dusty, high‑temperature harsh industrial environment.
✅ Heavy‑Duty Terminal & Cabinet‑Fixed Mounting
Thick copper bus‑bar terminals for heavy‑current wiring. Firm cabinet fixing brackets, convenient for assembling inside various standard industrial power cabinets.
Technical Specifications
| Item | Parameter |
|---|---|
| Product Series | QSA Fuse‑type Manual Knife Switch |
| Poles | 3P |
| Rated Current | 63A ~ 1250A |
| Rated Operational Voltage | AC 400V 50Hz |
| Operation Mode | Manual cabinet‑front handle operation |
| Protection | Manual isolation + Fuse short‑circuit / over‑current protection (fuses not included) |
| Contact Material | Silver‑plated copper knife contacts |
| Housing Base | Heat‑resistant flame‑retardant insulation |
| Installation | Cabinet fixed mounting |
| Application | Industrial main power cabinet, mining, construction, infrastructure power distribution |
Application Scenarios
- Main circuit manual isolation for large‑scale factory heavy‑duty power cabinets
- Workshop power cut‑off for equipment overhaul and routine maintenance
- Mining site, construction site heavy‑load temporary power distribution switchgear
- Infrastructure and industrial park power transformation projects
- Large mechanical equipment main power disconnection point
- Commercial complex heavy‑load power distribution cabinet systems
Our Advantages
Full‑range 63‑1250A complete specifications
Full stock covering 63A‑1250A. Support mixed container orders for switch‑panel manufacturers, fast bulk shipment available.
Industrial‑grade heavy‑current production standard
All conductive components adopt thick copper with silver‑plated treatment. Optimized arc‑quenching structure, specially designed for long‑term heavy‑load industrial working conditions.
Multi‑step strict factory testing
Each unit passes contact resistance test, high‑voltage withstand test and mechanical life test before leaving factory, reduce over‑heating and insulation failure risks.
Rich heavy‑current power‑project experience
Our engineering team is familiar with cabinet‑building pain‑points for high‑current projects, provide professional selection guidance instead of simple product supply.
Comprehensive technical document support
Supply CAD dimension drawings, wiring diagrams, datasheets and test documents for tender bidding and project review. Fast‑response overseas technical support.
Custom Solution
- OEM Brand Customization: Print private brand logo, custom model marking on handle and housing for branded resale.
- Special‑spec adaptation: Custom terminal structure and mounting dimension for non‑standard power cabinet requirements.
- Export‑grade custom packing: Neutral carton, customer‑branded carton, seaworthy reinforced packing for long‑distance sea shipment.
- Project‑level technical file service: CAD drawings, wiring schematics, test reports for bidding submission and local project approval.
- Large‑volume project priority production: Arrange priority production schedule for large infrastructure orders.
Contact our sales team, share your cabinet drawing or project technical parameters, we will deliver targeted technical proposal within 24 working hours.
FAQ
Q1: Are fuses included with QSA knife switch?
Q2: What current sizes are available for QSA series?
Q3: What is the key difference between QSA knife switch and ordinary load isolator switch?
Q4: Can QSA series switch break load current?
Q5: Can QSA be used for construction site power cabinets?
Q6: Do you support OEM private‑label service for distributors?
Q7: What documents can you provide for import clearance and bidding?
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