Westinghouse BR340ST 40A 3P 240V Circuit Breaker, Type BR, Plug-On, Shunt Trip | AmpState

Westinghouse BR340ST is a 40 A, 3-pole, 240 V circuit breaker designed for reliable circuit protection in panelboards, load centers, and electrical distribution systems. Built for everyday electrical work, it’s the smart choice for professionals who need a direct part-number match and dependable performance.

• Type BR circuit breaker—fits BR-series panels for seamless replacement
• Amperage 40 A
• Poles 3
• Voltage 240 V
• Plug-On mounting for quick, solid bus-bar connection
• Shunt Trip enables remote tripping for emergency shutdowns and automated safety controls
• Part Number BR340ST
• Manufacturer Westinghouse
• Availability from AmpState
• Ideal for maintenance teams, panel builders, and spare inventory where a direct part-number match matters

Use BR340ST to protect wiring and equipment in commercial spaces, light industrial setups, or data-center infrastructure. Its plug-on design speeds installation, while the 3-pole configuration provides balanced protection across all phases in a 240 V system. The integrated shunt-trip capability adds a critical layer of safety: you can initiate a remote trip to stop power delivery during faults, maintenance, or mandated emergency procedures without opening the enclosure.

What sets this breaker apart is the combination of a genuine Westinghouse BR-series performance with a plug-on, remote-trip capability in a compact 3-pole 240 V package. It’s a precise fit for existing BR panels, reducing the risk of compatibility issues and unwind time during replacements or upgrades. This makes it an excellent choice for stocking as a reliable spare—ensuring you’re prepared to keep critical circuits protected with confidence.

Who should consider the BR340ST:

• Facility managers and electricians maintaining panelboards and load centers
• Panel builders sourcing exact-part replacements for BR-series installations
• Maintenance inventories needing a dependable, ready-to-install 3P 240V breaker

If you’re unsure about fit, AmpState offers assistance to confirm compatibility and part-number match. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit. Add the Westinghouse BR340ST to your toolkit for fast, reliable protection that you can count on when it matters most.