JN-423 - 100A, 3-Pole, 3-Phase, Fusible, Safety Switch

JN-423 is a compact, rugged 100A safety switch engineered for reliable on/off isolation and precise overcurrent protection in demanding industrial and commercial environments. With 3-Pole and 3-Phase configuration, this fusible safety switch delivers clean, coordinated disconnects for multi-line electrical systems, helping keep motors and critical loads safe during startup, operation, and maintenance.

Why the JN-423 stands out

• 3-Pole, 3-Phase design ensures complete isolation of all live conductors, preventing partial power withdrawal and reducing the risk of arc flash during servicing.
• Fusible protection provides fast, selective overcurrent clearance, protecting both equipment and wiring from overloads while allowing quick fuse replacement to minimize downtime.
• 100A rating is well-suited for mid-sized motor loads, equipment control circuits, and branch protection without sacrificing space in control panels.
• Compact, maintainable construction supports easy installation in tight panel enclosures and straightforward fuse cartridge access for regular maintenance.
• Versatile application—ideal for motor disconnects, panelboards, and branch circuit protection where a dependable, easy-to-service fusible switch is required.

What problems this switch solves

• Prevents equipment damage from overloads by interrupting all three phases quickly and reliably.
• Delivers safe, clear isolation for maintenance or repairs, reducing exposure to live circuits.
• Streamlines panel design with a dedicated, compact fusible disconnect that fits into common control layouts.
• Enables targeted protection for motors and feeders, helping to minimize nuisance tripping and downtime.

How it works

The JN-423 sits in line with your motor or branch circuit. When protection is needed, the fusible element opens to interrupt current across all three phases, providing complete isolation and rapid fault clearing. The 3-pole arrangement guarantees that every conductor is disconnected, so maintenance staff can service equipment safely without guesswork about which lines remain energized.

Ideal use cases

• Motor disconnects in manufacturing lines, conveyors, and pumps requiring reliable fault isolation.
• Panelboard protection where a dedicated fusible switch simplifies wiring, labeling, and maintenance routines.
• Branch circuit protection in industrial or commercial equipment rooms with space-conscious panel layouts.
• HVAC equipment and large electrical assemblies needing a compact, serviceable safety switch.

Specifications at a glance

• Model: JN-423
• Amperage: 100A
• Poles: 3-Pole
• Phase: 3-Phase
• Fused: Fusible

Who benefits from the JN-423

• Electrical engineers and panel builders designing reliable, serviceable motor control systems.
• Maintenance teams seeking straightforward fuse replacement and clear, decisive isolation during servicing.
• Facility managers and OEMs looking for a durable, space-conscious safety switch that scales with mid-sized motor loads.

Practical tips for maximum value

Pair the JN-423 with correctly rated fuse links based on motor nameplate data and start-up current. During installation, verify that all three lines are fully de-energized before any servicing. Keep a small stock of compatible fuse links accessible to minimize downtime when replacements are needed. For panel designers, plan for a compact footprint that accommodates the 3-pole, 3-phase layout and allows straightforward wiring and labeling.

Engineered for dependable performance where reliable isolation and targeted overcurrent protection are non-negotiable, the JN-423 delivers a solid, maintenance-friendly solution for mid-size electrical systems. Get the protection you need with a switch that keeps your motors and circuits safe, organized, and easy to service.