I. Product Structural Design
The HR17 series fuse-disconnector switch adopts a modular integrated architecture, consisting of four components: base, rotating upper cover, arc extinguishing system, and fuse link. The base incorporates an embedded static contact system, supporting 2-pole, 3-pole, or 4-pole configurations. It can be directly mounted on busbars or fixed panels in distribution cabinets to meet diverse circuit requirements. The upper cover features a fan-shaped rotating structure with an integrated fuse link serving as the moving contact. Circuit connection/disconnection is achieved via rotational operation, while the high isolation distance ensures electrical safety during maintenance.
The arc extinguishing system is one of the core designs. The arc chute integrates multiple metal arc-splitter plates and a specialized arc-quenching device to rapidly extinguish arcs, enhancing breaking capacity and prolonging contact lifespan. The upper cover surface includes sealed inspection holes with built-in signal switches and fuse status monitoring modules. Some models are optionally equipped with auxiliary micro switches for real-time circuit status feedback, enabling remote monitoring.
II. Core Material Properties
All insulating components of the HR17 series utilize high-performance engineering plastics. Base materials are divided by current rating: nylon (PA) for 160A and below, and DMC unsaturated polyester molding compound for 250A and above. Both materials exhibit V0-level flame retardancy, high mechanical strength, and arc resistance. The upper cover and arc chute also employ nylon for operational safety and lightweight design.
(Specifications: 160 A ,250 A ,400 A ,630 A)
For conductive components, the contact system uses high-conductivity copper alloy with surface treatments to reduce contact resistance, ensuring stable conductivity. The fuse link, as the protection core, adopts precision low-melting-point alloys and standardized interfaces (e.g., NT00, NT1), supporting rapid replacement for reliable short-circuit protection. Metal arc-splitter plates further optimize arc extinction performance and enhance breaking capacity.
III. Typical Applications
The HR17 series is suitable for industrial power distribution systems with rated voltages up to 690V and currents up to 630A. Key functions include:
1. Power circuit protection: Acts as the main switch in high short-circuit current systems, enabling rapid fault isolation to prevent equipment damage from overloads or short circuits.
2. Motor control: Provides power isolation and emergency cutoff for motor circuits, though frequent motor start-stop operations should be avoided to extend service life.
3. Emergency power management: Delivers quick switching and protection in emergency power systems for buildings and factories.
4. Equipment maintenance safety: Features visible disconnection points to ensure operator safety during servicing.
Compliant with IEC 60947-3 and GB/T 14048.3 standards, the product is widely used in industrial automation, power distribution, and renewable energy systems. Its compact structure and flexible installation methods (vertical mounting, busbar connection, or panel fixing) make it ideal for distribution and control cabinets.
Summary
The HR17 series fuse-disconnector switch delivers efficient and safe industrial power distribution solutions through modular design, advanced materials, and intelligent arc-extinguishing technology. Standardized interfaces and status monitoring enhance operational convenience, while rigorous safety certifications and reliable protection capabilities establish it as a critical component in electrical system security.
