Siemens Q21540CT - 40A, 2-Pole, Circuit Breaker

Meet the Siemens Q21540CT, a 40A, 2-Pole Circuit Breaker designed for rugged reliability in distribution panels and motor control centers.

Its 2-Pole design ensures both hot legs trip together, delivering coordinated protection for 240V circuits in panelboards, switchboards, and control panels. This makes it an ideal choice for industrial, commercial, and OEM applications where dependable overcurrent protection and safe operation are non-negotiable.

• Precise 40A protection— guards wiring and connected equipment from overloads and short circuits in demanding electrical layouts.
• Two-pole configuration— guarantees simultaneous disconnection of both conductors, reducing the risk of dangerous fault conditions and simplifying wiring in multi-wire systems.
• Seamless Siemens integration— purpose-built for use in Siemens panelboards, switchboards, and control panels, delivering consistent fit, mounting, and trip characteristics within Siemens ecosystems.
• Versatile deployment— suitable for motor control centers, distribution panels, and critical feeders across industrial facilities, commercial spaces, and OEM builds.
• Durable performance— engineered to stand up to the demands of busy electrical rooms and continuous operation, ensuring long service life and dependable protection.

Use cases include upgrading existing Siemens installations or installing new protection in factory lines, HVAC controls, pumps, conveyors, and other 240V equipment. With the Q21540CT, you can expect reliable interruption when faults occur, protecting wiring insulation, downstream devices, and uptime.

Who it's for: electricians, maintenance technicians, facilities managers, OEM panel fabricators, and anyone prioritizing robust, Siemens-grade circuit protection in distribution and motor control applications.

Current rating: 40A. Poles: 2-Pole. Type: Circuit Breaker. The Siemens Q21540CT stands as a dependable, purpose-built solution for safeguarding power paths and ensuring safe, efficient operation of your electrical infrastructure.