{"product_id":"siemens-ll3b400-circuit-breaker","title":"Siemens | LL3B400 | Circuit Breaker | 400A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens LL3B400 is a rugged, low-voltage circuit breaker engineered for reliable protection in demanding electrical distributions. This \u003cstrong\u003e400A\u003c\/strong\u003e, \u003cstrong\u003e3-Pole\u003c\/strong\u003e device delivers robust three-phase protection for up to \u003cstrong\u003e600V\u003c\/strong\u003e systems, making it a dependable choice for industrial and commercial panels that require solid, standardized protection.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 400A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e LL3B400\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy choose the Siemens LL3B400 for your panel or switchgear? This breaker is designed as a direct-fit option within Siemens-compatible systems, providing precise alignment with existing gear and reducing the risk of mismatched components during maintenance, retrofit, or replacement projects. The 3-pole configuration protects all phases of a three-phase circuit, helping ensure balanced protection across your distribution network while simplifying installation and future servicing.\u003c\/p\u003e \u003cp\u003eKey use cases include:\n\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eMaintenance replacements in existing Siemens panel boards where LL3B400 is specified\u003c\/li\u003e \u003cli\u003eRetrofits to upgrade older systems to a single, consistent 400A, 3-pole protection strategy\u003c\/li\u003e \u003cli\u003eNew installations that require a Siemens-compatible 600V, 3-phase breaker with a 400A rating\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eCompared to generic or non-Siemens breakers, the LL3B400 aligns with Siemens design standards and compatibility expectations, helping ensure seamless operation within your protective scheme. This minimizes compatibility questions down the line and supports consistent protection across your electrical infrastructure.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eImportant note\u003c\/strong\u003e: Confirm fit and ratings before ordering. The part number LL3B400 is the best reference for compatibility with your equipment. If you’re upgrading or retrofitting, this specific model is designed to align with Siemens panels and switchgear that call for LL3B400, delivering reliable performance in demanding environments.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46427065548962,"sku":"LL3B400","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a0994f42-7fad-49d1-911a-c2784022b8c9.png?v=1765492979","url":"https:\/\/www.ampstate.com\/products\/siemens-ll3b400-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}