{"product_id":"siemens-ef3b045-circuit-breaker","title":"Siemens | EF3B045 | Circuit Breaker | 45A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSiemens EF3B045\u003c\/strong\u003e is a 45A, 3-Pole, 600V circuit breaker built for dependable protection in three-phase electrical systems. Designed for maintenance, retrofit, and replacement projects where exact specifications matter, this unit helps keep critical equipment safe and available.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 45A — provides precise overcurrent protection for mid-range 3‑phase circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles\u003c\/strong\u003e: 3-Pole — ideal for balanced, three-phase distribution, safeguarding motors, drives, and HVAC equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating\u003c\/strong\u003e: 600V — suitable for industrial and commercial systems that operate at higher voltage levels.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatibility reference\u003c\/strong\u003e: Part number EF3B045 is the best reference for ensuring the correct fit with Siemens panels and the EF3B family-related configurations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIntended use\u003c\/strong\u003e: Maintenance, retrofit, and replacement applications where exact specifications are required to match existing protection schemes.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this matters in real-world setups: using the exact EF3B045 ensures you’re maintaining the designed protective coordination for your three-phase feeders. It’s especially valuable when revamping an electrical panel, upgrading capacity, or replacing a worn or failed breaker without reengineering the entire protection scheme.\u003c\/p\u003e \u003ch3\u003ePractical use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReplacing a worn-out breaker in a three-phase distribution panel that feeds motors, pumps, or conveyors.\u003c\/li\u003e \u003cli\u003eRetrofits where your existing system specifies 45A, 3-pole, and 600V protection.\u003c\/li\u003e \u003cli\u003eMaintenance outages requiring a drop-in replacement that preserves established trip curves and protection settings.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility and installation tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eAlways confirm fit and ratings before ordering—the \u003cem\u003eEF3B045\u003c\/em\u003e part number is your strongest reference for compatibility.\u003c\/li\u003e \u003cli\u003eMatch the breaker type and bus connection to your panel’s design to ensure a reliable, secure fit.\u003c\/li\u003e \u003cli\u003eLabel and document the replacement to maintain proper protection coordination and maintenance records.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThis Siemens EF3B045 circuit breaker delivers clear, concrete value: a specific, reliable solution for protecting three-phase loads at up to 600V with a precise 45A rating. If your project requires exact specification matching to maintain safety, performance, and downtime reliability, this is the dependable choice.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46427522793634,"sku":"EF3B045","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_ad06fdd7-931c-4a09-bfbe-d05329579cd6.png?v=1765492978","url":"https:\/\/www.ampstate.com\/products\/siemens-ef3b045-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}