{"product_id":"siemens-q21540ctnc-40a-2p-240v-circuit-breaker","title":"Siemens Q21540CTNC Circuit Breaker, 40A, 2-Pole, 240V","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens 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.\u003c\/p\u003e \u003cp\u003eTwo-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.\u003c\/p\u003e \u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 40 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 2\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 240 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e Q21540CTNC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Circuit Breaker\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this breaker stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePart-number–driven compatibility:\u003c\/strong\u003e The exact match is verified by the part number, reducing the risk of mismatched protection in industrial panels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIndustrial-grade reliability:\u003c\/strong\u003e Designed for continuous operation in service, maintenance, and replacement scenarios where robust overcurrent protection is essential.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced 240V protection:\u003c\/strong\u003e The 2-pole configuration ensures simultaneous protection of both hot conductors for safe, efficient circuit interruption.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eIndustrial service panels undergoing modernization or expansion\u003c\/li\u003e \u003cli\u003eMotor feeders and 240V machinery circuits that require dependable overcurrent protection\u003c\/li\u003e \u003cli\u003eReplacement of aging or worn breakers in commercial or light industrial settings\u003c\/li\u003e \u003cli\u003eElectrical maintenance projects where precise part-number compatibility matters to uptime\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eCompatibility and installation tips\u003c\/h2\u003e\n\u003cp\u003eTo 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.\u003c\/p\u003e \u003cp\u003ePractical 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.\u003c\/p\u003e \u003cp\u003eReady 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.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46415730049186,"sku":"Q21540CTNC","price":460.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_513d6710-3734-4b27-839d-f68e6f4b470a.png?v=1765492974","url":"https:\/\/www.ampstate.com\/products\/siemens-q21540ctnc-40a-2p-240v-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}