Siemens Q21540CT2 40A 2P 240V Circuit Breaker, Plug-On | AmpState

The Siemens Q21540CT2 40A 2P 240V Circuit Breaker is a dependable, fast-to-install protection solution for panelboards, load centers, and electric distribution systems. This plug-on breaker is engineered to deliver reliable overcurrent protection in a compact, Siemens-compatible package—perfect for quick replacements and precise part-number matches.

Why the Siemens Q21540CT2 stands out

• Plug-On installation: Designed for seamless mounting in compatible Siemens panelboards and load centers, reducing service time and downtime during maintenance.
• Accurate part-number compatibility: A direct match to Siemens systems means fewer fit concerns and simpler ordering for spare inventories.
• Reliable 40 A protection: Ideal for safeguarding 240V circuits, helping prevent damage from overloads in both commercial and industrial environments.
• Two-pole design: Provides comprehensive protection across both live conductors on 240V circuits, improving safety and trip coordination in multi-wire applications.

Whether you’re stocking a maintenance van, outfitting a new panel build, or replacing a failed breaker, the Q21540CT2 is a smart, ready-to-use choice from AmpState. It’s built to align with Siemens distribution equipment, so you can trust compatibility in your existing infrastructure.

Key specifications at a glance

• Manufacturer: Siemens
• Part Number: Q21540CT2
• Product Type: Circuit Breaker
• Amperage: 40 A
• Poles: 2
• Voltage: 240V
• Mounting: Plug-On

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit. AmpState carries this Siemens model to support your precise requirements and quick-turn projects.