Square D H366NR Heavy Duty Safety Switch – 600A – 3 Pole – 600V – Fusible Disconnect – Neutral Included – NEMA 3R Outdoor Enclosure

The Square D H366NR Heavy Duty Safety Switch is a high-capacity fusible disconnect switch designed for critical commercial, industrial, and service entrance applications where reliable power isolation and system protection are essential. Manufactured by Schneider Electric under the Square D brand, this heavy-duty safety switch features a 600A current rating and a maximum voltage rating of 600V, making it suitable for large electrical distribution systems and heavy-duty equipment installations.

Configured as a 3-pole switch with a factory-installed neutral, the H366NR provides a dependable means of disconnecting power in three-phase systems requiring a neutral conductor. When used with the appropriate fuses, the switch delivers effective overcurrent and short-circuit protection while providing safe isolation for maintenance and servicing operations.

The switch is equipped with a quick-make, quick-break operating mechanism that ensures positive contact action and reliable performance under demanding operating conditions. Its heavy-duty construction is engineered for long service life and continuous operation in industrial environments where performance and reliability are critical.

Housed in a NEMA 3R galvannealed steel enclosure, the H366NR is designed for both indoor and outdoor applications. The rainproof, sleet-resistant enclosure protects internal components from weather exposure, making it ideal for service entrances, utility systems, and outdoor electrical installations.

Specifications

• Brand: Square D by Schneider Electric
• Manufacturer: Schneider Electric
• Part Number: H366NR
• UPC: 785901195825
• GTIN: 00785901195825
• Series: H Series
• Device Type: Heavy Duty Safety Switch
• Disconnect Type: Fusible
• Switch Action: Single Throw
• Number of Poles: 3 Pole
• Neutral: Factory Installed Neutral
• Current Rating: 600A
• Maximum Voltage Rating: 600V AC/DC
• Mounting Type: Surface Mount
• Terminal Type: Lugs
• Wire Size Range: #3/0 to 500 kcmil (Copper or Aluminum)
• Duty Rating: Heavy Duty

Electrical Performance

• Rated Current: 600A
• Maximum Voltage: 600V AC/DC
• Short-Circuit Current Rating (SCCR):
  • 10kA with Class H or K fuses
  • Up to 200kA with Class J or R fuses
• Fuse Protection: Provides overcurrent and short-circuit protection when equipped with appropriate fuses
• Quick-Make / Quick-Break Mechanism: Yes
• Suitable for Service Entrance Applications: Yes

Mechanical & Construction Features

• Heavy-duty industrial-grade construction
• Factory-installed neutral assembly
• Single-throw switching mechanism
• Surface-mounted installation
• Quick-make, quick-break operation
• Visible blade disconnect design
• Lug terminal connections
• Long mechanical service life
• Designed for demanding commercial and industrial applications

Enclosure & Protection

• Enclosure Rating: NEMA 3R
• Enclosure Material: Galvannealed Steel
• Rainproof Construction: Yes
• Sleet and Ice Resistant: Yes
• Indoor/Outdoor Rated: Yes
• Corrosion-Resistant Finish: Yes

Applications

• Service entrance disconnects
• Industrial power distribution systems
• Commercial electrical infrastructure
• Manufacturing facilities
• Utility and infrastructure projects
• Motor control and equipment isolation
• Outdoor electrical installations
• Three-phase systems requiring a neutral conductor

Standards & Certifications

• UL Listed
• Designed to meet applicable UL safety switch requirements
• Suitable for commercial and industrial electrical installations
• Heavy-duty safety switch construction for demanding applications

Environmental Ratings

• Suitable for indoor and outdoor installations
• Rainproof NEMA 3R enclosure
• Resistant to sleet and ice exposure
• Durable galvannealed steel construction
• Designed for harsh industrial and commercial environments
• Long-term reliability in outdoor service conditions

Additional Information

• Fusibility: Fusible
• Series: H Series Heavy Duty Safety Switch
• Electrical Interlock: None
• Mounting Style: Surface Mount
• Application: High-capacity power isolation and overcurrent protection for industrial and commercial systems requiring reliable disconnecting means and a factory-installed neutral conductor.