Siemens B340 40A 3P 240V Circuit Breaker, Bolt-On | AmpState

Siemens B340 40A 3P 240V Bolt-On Circuit Breaker is engineered to protect your panelboards, load centers, and electrical distribution points with precise, reliable performance. Designed for scenarios where a direct part-number match matters, this 40 A, 3-pole unit provides solid protection for three-phase circuits while simplifying procurement for maintenance teams and panel builders alike.

• Amperage: 40 A
• Poles: 3
• Voltage: 240 V
• Mounting: Bolt-On
• Manufacturer: Siemens
• Part Number: B340
• Type: Circuit Breaker

This breaker is a smart choice for anyone drafting or maintaining electrical distribution systems that require quick, exact-fit replacements. The Bolt-On design enables straightforward installation, helping technicians reduce downtime during panel maintenance, upgrades, or new-build projects. The B340’s three-pole configuration is ideal for three-phase circuits common in commercial environments, delivering coordinated protection across all live conductors.

• Direct part-number match: B340 ensures compatibility with Siemens panelboards and load centers that specify this exact unit, minimizing compatibility questions and procurement risk.
• Fast installation: Bolt-On mounting simplifies field service and retrofit work, so you can secure protection with less tool time.
• Trusted protection: Part of Siemens’ dependable protection lineup, designed for consistent performance in demanding electrical distributions.
• Ready to ship from AmpState: Available through AmpState to help you meet project timelines and maintenance schedules without delay.

Use cases include replacing a failed or outdated breaker in existing Siemens installations, stocking a reliable spare for future panel projects, or specifying a precise-B-number part during panel fabrication and field distribution work. This is particularly valuable for maintenance programs that rely on exact-fit components to ensure quick swaps and minimal service interruptions.

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit. Our team can review your panel specifications, verify the correct trip characteristics, and guide you to the right Siemens B-series component for your distribution equipment.

Choose the Siemens B340 40A 3P 240V Bolt-On Circuit Breaker from AmpState to streamline replacements, protect three-phase circuits with confidence, and keep your electrical system running smoothly.