Square D H366N Heavy Duty Safety Switch – 600A – 3 Pole – 600VAC – Fusible Disconnect – Neutral Included – NEMA 1 Indoor Enclosure

The Square D H366N Heavy Duty Safety Switch is a high-capacity fusible disconnect switch engineered for commercial, industrial, and power distribution applications requiring dependable equipment isolation and overcurrent protection. Manufactured by Schneider Electric under the Square D brand, this heavy-duty safety switch features a 600A current rating and a maximum operating voltage of 600VAC, making it suitable for large electrical distribution systems and high-horsepower equipment installations.

Designed with a 3-pole, 3-phase configuration and a factory-installed neutral, the H366N provides a safe and effective means of disconnecting electrical power while supporting systems that require a neutral conductor. When equipped with the appropriate fuses, the switch delivers reliable short-circuit and overcurrent protection for feeders, service entrances, motor circuits, and industrial equipment.

The switch incorporates a quick-make, quick-break operating mechanism that ensures positive switching action and enhanced operator safety. Its heavy-duty construction is designed to withstand demanding operating conditions while providing long mechanical life and dependable performance.

Housed in a NEMA 1 indoor enclosure, the H366N is intended for installation in protected indoor environments such as electrical rooms, manufacturing facilities, commercial buildings, and power distribution centers. Its robust design and high current capacity make it an ideal choice for critical power isolation applications.

Specifications

• Brand: Square D by Schneider Electric
• Manufacturer: Schneider Electric
• Part Number: H366N
• Series: H Series
• Device Type: Heavy Duty Safety Switch
• Disconnect Type: Fusible
• Switch Action: Single Throw
• Number of Poles: 3 Pole
• Phase: 3 Phase
• Neutral: Factory Installed Neutral
• Current Rating: 600A
• Voltage Rating: 600VAC
• Mounting Type: Surface Mount
• Duty Rating: Heavy Duty
• Enclosure Type: NEMA 1 Indoor

Electrical Performance

• Rated Current: 600A
• Maximum Voltage: 600VAC
• Circuit Configuration: 3-Phase
• Fuse Protection: Supports field-installed fuses for overcurrent and short-circuit protection
• Quick-Make / Quick-Break Mechanism: Yes
• Suitable for Service Entrance Applications: Yes
• Heavy-Duty Switching Capability: Designed for high-capacity power systems

Mechanical & Construction Features

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

Applications

• Industrial power distribution systems
• Service entrance disconnects
• Large motor control systems
• Manufacturing facilities
• Commercial electrical infrastructure
• Distribution feeders and switchboards
• Power control centers
• Equipment isolation and maintenance disconnecting means

Standards & Certifications

• UL Listed
• Designed to meet applicable UL safety switch requirements
• Suitable for commercial and industrial electrical installations
• Complies with industry standards for heavy-duty safety switches

Environmental Ratings

• NEMA Rating: NEMA 1
• Installation Location: Indoor Use Only
• Suitable for protected electrical environments
• Designed for long-term industrial service
• Durable construction for demanding operating conditions

Additional Information

• UPC: 785901451990
• GTIN: 785901451990
• Series: H Series Heavy Duty Safety Switch
• Fusibility: Fusible
• Mounting Style: Surface Mount
• Application: High-capacity power isolation and protection for commercial and industrial systems

Returns are easy

You may return items within 30 days of delivery for a refund.

FREE Shipping on orders over $149.

My Circuit Breakers offers one to five day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s).

Same Day Shipping

We strive to ship out your items within one business day.

In rare circumstances, My Circuit Breakers may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.

My Circuit Breakers provides a comprehensive 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer). Extended warranties are available upon request.