Westinghouse BR390ST 90A 3P 240V Circuit Breaker, Type BR, Shunt Trip | AmpState

The Westinghouse BR390ST is a rugged, high-capacity circuit breaker designed for dependable protection in panelboards, load centers, and electrical distribution systems. With a 3-pole configuration, 90 A rating, and 240 V operation, it delivers reliable overcurrent protection while giving you the option of remote control through its built-in shunt trip.

Key features that matter in real-world setups

• Type BR, 3-pole, 90 A, 240 V — a compact, unitized solution built for standard Westinghouse/BR panelboards and compatible distribution boards.
• Shunt Trip — enables remote tripping for safe, fast responses from building automation systems, alarm panels, or safety interlocks.
• Replacement-ready — ideal for projects that require BOM alignment with the original part number, ensuring seamless upgrades or spares stocking.
• Manufacturer support — backed by Westinghouse engineering lineage, ensuring consistent performance and compatibility within BR-series ecosystems.
• Availability — offered by AmpState, with assistance available to confirm fit and compatibility if you’re matching a part number to your current setup.

Why this 90A BR390ST matters for your electrical system

When safety and reliability are non-negotiable, remote trip capability can be a lifesaver—especially in facilities with centralized safety automation or centralized shutdown workflows. The BR390ST couples heavy-duty protection with the convenience of a shunt-trip accessory, making it easier to integrate into larger control schemes without sacrificing standard overcurrent protection.

Ideal use cases and who benefits most

• Facility maintenance and reliability engineers seeking a dependable spare that perfectly matches original BOM parts for quick field replacement.
• Electrical contractors working on panelboard retrofits or replacements where a BR-type, 3-pole, 90 A device is specified.
• Data centers and industrial environments needing remote trip capability to align with safety interlocks and centralized control systems.
• New installations requiring a proven, compatible 3P 240V protection device with remote trip functionality.

Practical guidance and tips

Use BR390ST when your electrical design calls for a standard BR-frame breaker with remote trip capability. Confirm that your panelboard or load center supports a BR-series device and that the outgoing wiring and bus configurations are compatible with a 3-pole, 90 A, 240 V circuit. If you’re aligning with an original part number for BOM consistency, this model is specifically intended to keep procurement aligned with the source specification.

Specifications at a glance

• Manufacturer: Westinghouse
• Part number: BR390ST
• Type: BR
• Amperage: 90 A
• Poles: 3
• Voltage: 240 V
• Special feature: Shunt Trip
• Availability: AmpState

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit, ensuring you get the exact BR390ST you need for reliable, code-compliant circuit protection.