Square D H363EI - 100A, Switch, NEMA 1

Square D H363EI is a rugged 100A fusible switch designed for reliable on/off isolation and overcurrent protection in demanding industrial and commercial environments. With a compact footprint and a focus on maintainability, this NEMA 1-rated disconnect provides a dependable solution where space is precious and uptime matters.

Why the H363EI stands out

Built to excel in real-world control rooms and equipment enclosures, the H363EI couples a sturdy mechanical interface with straightforward fuse replacement. The result is a switch that stays dependable through daily cycling, minimizes downtime during maintenance, and securely isolates circuits when protection trips occur. Its NEMA 1 enclosure is optimized for indoor, dry-location operation, delivering protection where exposure to dust or incidental moisture is minimal.

Key benefits and use cases

• 100A capacity for reliable protection — serves as a main disconnect or feeder switch in motor circuits, control panels, and branch protections.
• NEMA 1 indoor enclosure — purpose-built for dry indoor environments found in workshops, offices, and plant rooms, helping guard wiring and components from dust and incidental contact.
• Maintained accessibility — designed for straightforward operation and quick maintenance, so technicians can perform fuse replacement and inspections with minimal downtime.
• Compact design — a space-efficient solution that fits neatly into crowded panels and control cabinets without compromising safety or performance.
• Versatile for motor disconnects and panel protection — ideal where reliable isolation and protective switching is required for motors, control circuits, and branch connections in everyday industrial workflows.

Ideal applications

Use the Square D H363EI 100A NEMA 1 switch as a dependable motor disconnect in small to mid-size motor drives, as a service or feeder disconnect in panelboards, or as a branch-circuit protection switch in compact control enclosures. It’s a practical choice for machine tools, processing lines, conveyors, HVAC equipment, and other equipment where a rugged, maintainable fusible switch supports safe operation and rapid maintenance.

Specifications at a glance

• Model: H363EI
• Amperage: 100A
• NEMA rating: NEMA 1
• Type: Fusible switch for on/off isolation and overcurrent protection
• Enclosure location: Indoor, dry locations

Maintenance and best practices

For longevity, pair the H363EI with compatible Square D fuse elements and perform routine checks on the handle operation, terminal connections, and fuse status. Keep the enclosure clear of debris, verify that wiring torque adheres to enclosure guidelines, and schedule periodic inspections to confirm continued reliable isolation during trips or maintenance cycles. By choosing the H363EI, you invest in a maintenance-friendly disconnect that prioritizes safety, ease of service, and consistent protection for your critical electrical circuits.