{"product_id":"siemens-ef3a003-circuit-breaker","title":"Siemens | EF3A003 | Circuit Breaker | 3-Pole","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens EF3A003, a 3-pole circuit breaker built for robust protection of three-phase electrical systems. This Siemens component is ideal for maintenance, retrofit, and replacement projects where exact compatibility matters. When you need a reliable reference, EF3A003 is the definitive part number to guide your fit check and ratings match.\u003c\/p\u003e \u003ch2\u003eKey benefits of the Siemens EF3A003 3-Pole Circuit Breaker\u003c\/h2\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-Pole protection\u003c\/strong\u003e for balanced safeguarding of three-phase loads in industrial and commercial panels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement-ready and retrofit-friendly\u003c\/strong\u003e—designed to slip into existing Siemens installations that require matching specs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest compatibility reference\u003c\/strong\u003e—use the EF3A003 part number to confirm fit, ratings, and compatibility before you order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrusted Siemens reliability\u003c\/strong\u003e—backed by Siemens engineering, offering consistent performance in demanding environments.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e \u003cul\u003e\n\u003cli\u003eMaintenance work on three-phase panels where downtime needs to be minimized and compatibility is non-negotiable.\u003c\/li\u003e\n\u003cli\u003eRetrofits that upgrade protection without reconfiguring existing enclosures or wiring.\u003c\/li\u003e\n\u003cli\u003eSpare parts inventory for service teams maintaining Siemens-based electrical systems.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and installation tips\u003c\/h3\u003e \u003cul\u003e\n\u003cli\u003eAlways confirm fit and ratings before ordering. The part number EF3A003 is your strongest reference for compatibility.\u003c\/li\u003e\n\u003cli\u003eCross-check with your panel's documentation to ensure the 3-Pole configuration aligns with the system design and trip characteristics you require.\u003c\/li\u003e\n\u003cli\u003eVerify mounting style, terminal size, and conductor ranges match your enclosure and wiring practices.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch4\u003eSpecifications at a glance\u003c\/h4\u003e \u003cul\u003e\n\u003cli\u003ePoles: 3-Pole\u003c\/li\u003e\n\u003cli\u003ePart number: EF3A003\u003c\/li\u003e\n\u003cli\u003eManufacturer: Siemens\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46424789581986,"sku":"EF3A003","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-ef3a003-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}