Square D | PBQ4640GR | Fusible Bus Plug | 400A | 600V

Square D PBQ4640GR is a purpose-built fusible bus plug designed for reliable, plug-in protection in compatible electrical distribution systems. rated at 400A and 600V, this component is ideal for maintenance, retrofit, and replacement projects where exact specifications matter.

Key use cases

• Maintenance tasks on Square D switchgear or distribution panels that require a like-for-like fusible bus plug replacement.
• Retrofit projects where upgrading or updating protection devices demands a 400A, 600V rating with a proven, compatible form factor.
• Spare parts stock for facilities with high uptime requirements, ensuring quick swaps to minimize downtime.
• Repairs that require matching the exact part reference to maintain electrical safety and system protection integrity.

Specifications at a glance

• Amperage: 400A
• Voltage: 600V
• Part number: PBQ4640GR

Important compatibility notes

Before ordering, confirm fit and ratings against your equipment. The PBQ4640GR part number is the best reference to ensure compatibility with your Square D assemblies and to maintain the intended protection profile.

Who benefits from this fusible bus plug

• Electrical maintenance technicians and contractors who service Square D gear.
• Facilities managers responsible for asset reliability and uptime in industrial, commercial, or utility environments.
• Engineers planning retrofit projects that require exact 400A, 600V protection components for seamless integration.

Why this Square D bus plug stands out

• Exact 400A, 600V rating ensures consistent protection behavior and coordination within existing protection schemes.
• Designed for straightforward maintenance and replacement, reducing downtime during service windows.
• Part number accuracy (PBQ4640GR) provides clear reference for compatibility and future replacements.

When you need a dependable, specification-matched fusible bus plug for Square D equipment, the PBQ4640GR delivers precise rating, reliable performance, and clear compatibility guidance—so you can keep panels protected and systems running smoothly.