3 Pole Fuse Switch Disconnector 100A 690V

The ZHENGRONG HR17-100 fuse switch disconnector is a compact, professional-grade unit designed for low-voltage three-phase distribution systems. It serves as a load switch, isolating switch and emergency switch in one device, while the integrated fuses provide short-circuit protection for downstream equipment.

The 3-pole design protects all three phases of the circuit, with three bottom terminals for straightforward cable or busbar connection. Rated 100A at 690V AC, 50/60Hz, it covers standard industrial and commercial supply networks worldwide.Design & OperationA wide, integrated grey handle on top of the unit allows comfortable manual opening and closing. The hinged front section flips down for fast fuse inspection and replacement — without disconnecting the wiring — minimizing maintenance downtime.

The translucent blue inspection window with a wavy edge gives a clear view of fuse condition at a glance, so operators can identify a blown fuse before opening the unit. When open, the switch provides a distinct visible break, ensuring safe isolation during maintenance or emergencies.Construction & InstallationThe housing is molded from light-grey flame-retardant engineering plastic with a matt finish, offering high insulation performance and mechanical strength. Internal contacts are made of high-conductivity metal (silver-plated copper or brass) for low contact resistance and stable temperature performance.

The unit is fixed to the mounting plate inside distribution cabinets via two base mounting holes, and its compact rectangular footprint saves valuable panel space.

Feature

3-in-1 function

● — load switch, isolating switch and fuse protection combined in one compact unit, saving space and cost.

3-pole three-phase protection

● — simultaneous protection of all phases for three-phase loads.

Hinged flip cover

● — fast fuse inspection and replacement without disconnecting wiring, minimizing downtime.

Visible break isolation

● — clear disconnection point when open, ensuring safe maintenance and emergency shutdown.

Translucent blue window

● — blown-fuse detection at a glance without opening the switch.

Flame-retardant housing

● — high-strength engineering plastic with excellent insulation, impact and heat resistance.

High-conductivity contacts

● — silver-plated copper or brass terminals for low contact resistance and stable performance.

Wide voltage/frequency range

● — rated 690V AC, 50/60Hz for global compatibility.

Easy panel mounting

● — base mounting holes for quick screw fixing; compact design saves cabinet space.

Quality certified

● — ISO9000, CCC and CE certified for domestic and export markets.

Application

● Low-voltage distribution boards and power boxes

● Motor control centers 

● Power disconnection and protection for three-phase equipment

● Industrial plants and commercial buildings

● Main switch or branch-circuit switch in distribution systems

● Emergency switching and maintenance isolation

● Panel builders, electrical contractors and plant maintenance teams