Square D QO31001021 100A 3P 240V Circuit Breaker, Plug-On, Shunt Trip | AmpState

Discover the Square D QO31001021, a purpose-built circuit breaker engineered to safeguard panelboards, load centers, and electrical distribution networks. This 100 A, 3-pole, 240 V unit is part of the trusted QO family, and its plug-on design simplifies installation in the field.

The standout feature is the integrated plug-on shunt trip. When an external control signal is applied, the shunt trip interrupts power quickly, delivering a safe, remote-trip capability that complements manual operation for critical safety procedures and maintenance work.

• Exact part-number match: QO31001021 is a direct replacement part, designed to drop into Square D panels without modification, reducing downtime and compatibility risk.
• Three-pole protection: 3P configuration handles three-phase systems, with a 100 A rating for robust fault current interruption.
• Voltage and application: Rated for 240 V operation, ideal for standard industrial and commercial distribution setups.
• Plug-On mounting: Fast, tool-light installation that minimizes panel downtime during upgrades or replacements.
• Shunt-trip capability: Enables remote tripping via external control devices, enhancing safety protocols during maintenance or emergency scenarios.
• Practical for stock and service teams: A smart choice for maintenance shops, panel builders, and spare inventories where quick access to exact fits matters.
• Assistance with fit: Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.

Use cases: replace failed breakers in commercial buildings, retrofit existing panels with remote-trip protection, or keep a ready spare on hand for rapid service calls. Compared to other solutions, the plug-on shunt-trip-equipped QO31001021 provides a precise, trusted replacement that integrates seamlessly with standard Square D QO equipment and distribution architectures.