{"product_id":"siemens-ckl3b400-circuit-breaker","title":"Siemens | CKL3B400 | Circuit Breaker | 400A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens CKL3B400 circuit breaker — a rugged, three-pole protection device engineered for heavy-duty electrical systems. With a 400 A rating and a 600 V maximum, this Siemens part is built to handle demanding service conditions while ensuring reliable, coordinated protection across all three phases.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole (three-phase)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e CKL3B400\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIntended use:\u003c\/strong\u003e maintenance, retrofit, and replacement\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatibility note:\u003c\/strong\u003e Confirm fit and ratings before ordering. The part number CKL3B400 is the best reference for compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this matters for your system\u003c\/h3\u003e\n\u003cp\u003eThe CKL3B400’s three-pole design ensures simultaneous disconnection of all phases, protecting downstream equipment and reducing the risk of unbalanced loads. When sourced as part of Siemens’ ecosystem, it offers consistent behavior with other breakers, helping you maintain coordinated protection across your distribution panels and motor feeders. This makes it a reliable choice for retrofit projects where exact specifications are required to match existing infrastructure.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReplacing a failed or outdated breaker in Siemens panels that require a 3-Pole, 400 A, 600 V device\u003c\/li\u003e \u003cli\u003eRetrofit projects on industrial lines or manufacturing equipment where higher current protection is needed\u003c\/li\u003e \u003cli\u003eUpgrading electrical distribution in service panels or motor control centers that demand robust three-phase protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and installation guidance\u003c\/h3\u003e\n\u003cp\u003eBefore purchasing, verify that your panel or enclosure accepts a 3-Pole, 400 A, 600 V breaker like the CKL3B400. Use CKL3B400 as the primary reference to ensure compatibility with your existing infrastructure. Follow standard electrical installation practices: disconnect power before work, relate the breaker to the panel’s ratings, and confirm secure termination and proper clearance for safe operation. For best results, match this breaker to the Siemens lineup already in use in your system to maintain consistent protection characteristics.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46424358060194,"sku":"CKL3B400","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a085eff1-75dd-47ee-b131-4c8df8f0489b.png?v=1765492976","url":"https:\/\/www.ampstate.com\/products\/siemens-ckl3b400-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}