Square D QOB350VH1021 50A 3P 240V Circuit Breaker, QO, Shunt Trip | AmpState

Square D QOB350VH1021 is a 50 A, 3-pole, 240 V QO circuit breaker equipped with a shunt trip for reliable remote disconnection. Designed for panelboards, load centers, and electrical distribution systems, this unit is built to perform where dependability matters most—across commercial and light industrial applications.

Key advantages of this breaker go beyond basic protection. The built-in shunt-trip capability enables instant isolation from remote controls or safety interlocks, supporting safer maintenance procedures, quicker fault response, and enhanced compliance with safety protocols. Its QO format ensures a snug, drop-in fit in compatible Square D panelboards, minimizing installation time and reducing downtime during upgrades or retrofit projects.

Ideal use scenarios:

• Retrofit projects requiring a consistent part number for fleet-wide replacements, simplifying stocking and service planning.
• Remote shutdown needs in facilities where safety interlocks or building management systems demand quick circuit isolation.
• Maintenance planning for commercial spaces with distributed 240 V circuits, where rapid isolation protects personnel and equipment.
• New installations that align with existing QO-based panels and distribution setups, ensuring straightforward compatibility.

Specifications at a glance:

• Amperage: 50 A
• Poles: 3
• Voltage: 240 V
• Type: QO
• Shunt Trip: Included
• Part Number: QOB350VH1021
• Manufacturer: Square D (Schneider Electric)
• Availability: AmpState

Compatibility and support: This part is commonly used in panelboards and load centers that accept QO breakers. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.