3 Pole Fuse Switch Disconnector DIN Rail 690V

The ZHENGRONG 3-pole fuse switch disconnector is a professional fuse combination unit designed for three-phase low-voltage power distribution. It integrates a switch-disconnector with fuse protection into one compact device: the fuses provide overload and short-circuit protection, while the switching mechanism provides a clear visible break for safe isolation during maintenance or emergency shutdown.

Built to GB/T 14048.3, the unit is rated for insulation voltage up to 690V at 50Hz, covering standard three-phase industrial supply systems. The three-pole design protects all phases simultaneously, offering complete protection for motors, machinery and branch circuits.

Design & Safety

The housing is molded from high-strength, flame-retardant engineering plastic with a matt, scratch-resistant finish. A large translucent blue inspection window lets operators check fuse condition at a glance — without opening the unit or breaking the circuit. The switch mechanism is designed with reliable contact pressure and arc-quenching characteristics for safe operation under load.

When the switch is opened, a distinct visible break is formed, eliminating the risk of accidental re-energization during maintenance — an essential safety feature for electrical technicians and panel operators.

Installation

The unit is equipped with mounting feet on the base for quick installation on standard DIN rails or mounting plates inside distribution cabinets. Its compact block design saves valuable panel space in dense switchgear layouts.

Feature

Fuse + disconnector in one unit — overload and short-circuit protection combined with switching and visible isolation, saving space and cost.

3-pole three-phase protection — simultaneous protection of all three phases for motors and branch circuits.

Clear visible break — opening the switch provides a distinct disconnection point, ensuring operator safety during maintenance.

Tool-free fuse inspection — translucent blue window allows fuse status checks at a glance without opening the cover.

Flame-retardant housing — high-strength engineering plastic with excellent impact, heat and aging resistance.

Safe load switching — optimized contact pressure and arc-quenching design for reliable operation.

Easy installation — base mounting feet fit standard DIN rails or mounting plates; compact design saves panel space.

Quality certified — GB/T 14048.3 compliant; ISO9000, CCC and CE certified for domestic and export markets.

Application

Three-phase low-voltage distribution boards and switchgear

Motor control centers (MCC) and motor branch-circuit protection

Industrial control panels and power distribution boxes

Building electrical and commercial power systems

Power supply protection for machinery and production equipment

Maintenance isolation points in power distribution systems

Switchgear for factories, infrastructure and commercial projects

Panel builders, electrical contractors and plant maintenance teams