Siemens Q345 45A 3P 240V Circuit Breaker | AmpState

Meet the Siemens Q345 45A 3P 240V circuit breaker—a dependable protection device built for everyday electrical work. It’s designed to shield panelboards, load centers, and distribution networks from overcurrent, helping keep services running smoothly and safely.

This unit is ideal for replacement projects and stocking spares, ensuring your procurement stays aligned with the original part number on your BOM. With the Q345, you safeguard compatibility and streamline maintenance when you’re retooling or expanding existing Siemens installations.

Key specifications at a glance

• Manufacturer: Siemens
• Part number: Q345
• Product type: Circuit Breaker
• Amperage: 45 A
• Poles: 3
• Voltage: 240 V
• Applications: Panelboards, load centers, electrical distribution

Why the Q345 stands out

What makes this 3-pole, 45A 240V breaker compelling is its seamless compatibility with Siemens panel hardware and BOM integrity. It’s purpose-built to protect multi‑phase circuits in standard 240V systems, delivering predictable performance when you need reliable circuit protection without guessing about fit.

Ideal use cases

• Replacement installations in existing Siemens panelboards and load centers
• Spare stock for maintenance teams to minimize downtime during outages
• Procurement that stays in sync with the original equipment BOM to prevent mismatches
• Field service jobs where a genuine Siemens Q-line part is required for compliance

Compatibility & support

Need help confirming fit? AmpState is ready to assist with part-number matching and compatibility checks. If you’re unsure whether Q345 aligns with your specific panel or bus configuration, send a message and our team will verify the match to keep your project on track.

Stock this Siemens Q345 today and experience reliable protection, easy procurement, and BOM-consistent maintenance for your electrical distribution system.