HH15 Isolating Switch-Fuse Combination & Isolating Switch

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Overview

The HH15(QSA) series fuse combination isolators and HH15A(OA) are installed in draw-out type low-voltage complete switchgear for manual operation in distribution and motor circuits with high short-circuit current levels.

The products comply with GB/T 14048.3 and IEC 60947-3 standards.

Model Designation & Code Definition

Structural Features

● The switch adopts a fully enclosed construction to enhance operational reliability and performance stability.

● It features a unique rolling plug-in contact system. Each phase is equipped with two sets of double-break contact assemblies, which can be configured in series or parallel to satisfy requirements for circuits with different rated currents and utilization categories.

● Current passes through multiple rolling pins of the contact system, substantially reducing the electromagnetic repulsion force on each pin. During switching movement, the contact between rolling pins and fixed contacts combines rolling and sliding friction to effectively prevent contact welding.

● The operating mechanism is fitted with an energy-storage spring, so the moving contact speed is independent of applied operating force and manual operating speed.

● The operating assembly consists of a front-panel mounted handle, meshed drive coupling, extension shaft, shaft coupling and drive shaft. Extension shafts and relevant couplings are only used when the standard drive shaft length is insufficient.

● The mounting depth inside complete switchgear cabinets is flexibly adjustable to facilitate combined installation of various electrical components.

Main Technical Data

Main Technical Parameters for 4HH15(QSA) Series Fuse Combination Isolator