Square D PBQ3640G 400A 3P 600V Safety Switch, Fusible | AmpState

Built for everyday electrical work, the Square D PBQ3640G Fusible Safety Switch is your reliable solution for equipment disconnect and isolation at the point of use. With a rugged 400 A rating, 3 poles, and a 600 V capability, this switch is engineered to keep critical circuits secure while making maintenance and retrofit work straightforward.

Why the PBQ3640G stands out

• Fusible protection in a compact safety switch: integrated fuse elements deliver rapid fault interruption, enhancing downstream protection and improving arc-flash safety during faults.
• Point-of-use isolation: streamlines maintenance and lockout/tagout procedures by providing a clear, accessible disconnect right where the equipment is used.
• Retrofit-friendly with consistent part numbers: designed to align with existing Square D configurations, making replacements and scheduled maintenance simpler when the part number must stay the same.
• Industrial-grade reliability: backed by Square D’s reputable legacy in safety and distribution equipment, built to withstand demanding environments.

Key specifications

• Manufacturer: Square D
• Part number: PBQ3640G
• Amperage: 400 A
• Poles: 3
• Voltage: 600 V
• Type: Fusible safety switch

Ideal use cases

This safety switch is well-suited for industrial and commercial environments where reliable isolation is essential. Practical applications include:

• Disconnection of large feeders and equipment in factories, processing plants, and distribution panels
• Retrofit projects where the exact part number must be preserved for compatibility or documentation
• Maintenance planning and scheduled shutdowns where a clear, safe point of isolation is required
• Service entrances and motor control scenarios that demand robust 600 V protection

Compatibility and support

AmpState stocks the PBQ3640G and can assist with confirming fit for your specific setup. If you’re replacing an aging switch or planning a retrofit, we can help verify that the 400 A, 3-pole, 600 V fusible setup meets your circuit requirements and aligns with your existing equipment inventory.

Practical guidance for installation and maintenance

• Ensure the enclosure and bus rating are compatible with a 400 A, 3-pole 600 V fusible switch.
• Prepare for proper fuse selection and replacement procedures in line with your system’s protection requirements.
• Follow standard lockout/tagout practices during installation and servicing to maintain a safe work environment.
• Schedule periodic inspections of terminals and fuse links to sustain reliable performance over time.

With the PBQ3640G, you gain a dependable, ready-to-install safety switch that supports efficient maintenance, precise isolation, and streamlined retrofits—backed by AmpState’s availability and compatibility assistance when you need it.