Siemens Q21540CTNC Circuit Breaker, 40A, 2-Pole, 240V

Siemens Q21540CTNC is a rugged 40A, 2-Pole, 240V circuit breaker designed for industrial service, maintenance, and replacement projects. Use the part number Q21540CTNC to confirm compatibility with your panel and application requirements, ensuring a precise fit and reliable protection for your critical circuits.

Two-pole design provides balanced protection for 240V circuits, safeguarding both hot legs and simplifying wiring in control panels, motor feeders, and industrial equipment enclosures. Built by Siemens, this unit is engineered for dependable performance in demanding environments where downtime is costly and safety matters.

Key specifications

• Amperage: 40 A
• Poles: 2
• Voltage: 240 V
• Part Number: Q21540CTNC
• Product Type: Circuit Breaker

Why this breaker stands out

• Part-number–driven compatibility: The exact match is verified by the part number, reducing the risk of mismatched protection in industrial panels.
• Industrial-grade reliability: Designed for continuous operation in service, maintenance, and replacement scenarios where robust overcurrent protection is essential.
• Balanced 240V protection: The 2-pole configuration ensures simultaneous protection of both hot conductors for safe, efficient circuit interruption.

Ideal use cases

• Industrial service panels undergoing modernization or expansion
• Motor feeders and 240V machinery circuits that require dependable overcurrent protection
• Replacement of aging or worn breakers in commercial or light industrial settings
• Electrical maintenance projects where precise part-number compatibility matters to uptime

Compatibility and installation tips

To ensure the Q21540CTNC is the right fit, verify the application requirements and confirm compatibility via the part number. If you’re unsure about matching a part number to your equipment, or you need help confirming compatibility, send us a message—our team can guide you to a precise match and smoother installation.

Practical installation notes: always follow local electrical codes and safety procedures. Disconnect power before work, use appropriate personal protective equipment, and ensure correct torque and terminal connections for reliable performance.

Ready to protect your 240V circuits with a trusted Siemens solution? Add the Q21540CTNC to your cart or contact us for direct compatibility confirmation and expert assistance.