Square D QH330 30A 3P 240V Circuit Breaker, Plug-On | AmpState

Square D QH330 30A 3P 240V Plug-On Circuit Breaker from AmpState is engineered to protect your electrical distribution with precision. Designed for panelboards, load centers, and general electrical distribution, this 30 amp, 3-pole unit is the reliable choice for replacement projects and stocking spares. Keeping the original part number in your BOM is easy with the QH330.

Key specifications

• Manufacturer: Square D
• Part Number: QH330
• Product Type: Circuit Breaker
• Amperage: 30 A
• Poles: 3
• Voltage: 240V
• Mounting: Plug-On
• Applications: Panelboards, load centers, electrical distribution

Why this breaker stands out

The QH330 is a plug-on design that simplifies installation by snapping directly onto compatible bus systems, reducing setup time and minimizing field wiring complexity. With a 3-pole configuration, it provides balanced protection for 3-phase 240V circuits, making it a dependable fit for commercial and industrial panels where uptime matters. This unit is specifically suited for those who need to match an original part number precisely to maintain BOM integrity and ensure seamless panel compatibility.

Ideal use cases

• Replacing a failed 30A, 3-pole, 240V breaker in an existing Square D panelboard or load center.
• Stocking spare units to keep service fleets aligned with the original BOM and part numbering.
• Maintaining or restoring electrical distribution systems where exact OEM components are required for safety and certification.

Compatibility and purchase support

AmpState offers the QH330 as an authentic Square D component ready for procurement. If you’re unsure about fit, message us and we’ll help you confirm compatibility and ensure you’re selecting the correct part for your panel model and year.

Practical installation tips

• Always de-energize the panel and follow lockout/tagout procedures before replacement.
• Verify that the panel is listed for a 3-pole 240V breaker and that the QH series is the correct family for your enclosure.
• Handle the breaker with care to avoid damage to the plug-on terminals and ensure a secure, snug connection to the bus.
• After installation, test the circuit to confirm proper operation and trip characteristics under controlled conditions.