{"product_id":"siemens-ed21b045-45a-120v-1-pole-bolt-on-circuit-breaker","title":"Siemens ED21B045 - 45 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens ED21B045 — a 45A, 120V, 1-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for steady performance in residential, commercial, and light industrial installations, it’s engineered to safeguard your electrical system with precision and ease.\u003c\/p\u003e \u003cp\u003eKey advantages you’ll notice in everyday use:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e creates a rigid, vibration-resistant bus connection, reducing movement that can lead to loose contacts or arcing over time.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by accurately sensing overloads and rapid short-circuits, helping prevent nuisance trips while ensuring critical faults are interrupted quickly.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e1-pole, 45A at 120V\u003c\/strong\u003e configuration is ideal for protecting individual branch circuits such as lighting, outlets, small equipment, or dedicated loads without unnecessary power interruption elsewhere in the system.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-load center compatibility\u003c\/strong\u003e ensures straightforward integration with matching Siemens panelboards and load centers, simplifying replacement or upgrade projects.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile across environments\u003c\/strong\u003e designed to perform reliably in homes, offices, retail spaces, and light industrial setups where dependable circuit protection matters.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhat problems does ED21B045 solve?\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003ePrevents damage from overloads and short circuits by interrupting the faulty circuit before wiring or devices overheat.\u003c\/li\u003e \u003cli\u003eMinimizes downtime and maintenance through a robust bolt-on design that stays securely connected even in vibration-prone installations.\u003c\/li\u003e \u003cli\u003eProvides a compatible, drop-in solution for existing Siemens panels, reducing installation guesswork and ensuring proper fitment.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eTechnical snapshot at a glance:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer\u003c\/strong\u003e: Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: ED21B045\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 45A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage\u003c\/strong\u003e: 120V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles\u003c\/strong\u003e: 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting\u003c\/strong\u003e: Bolt-on\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIdeal use scenarios\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eResidential electrical panels protecting individual lighting circuits, kitchen outlets, or garage circuits.\u003c\/li\u003e \u003cli\u003eCommercial load centers safeguarding small office circuits, vending equipment, or server room outlets with targeted protection.\u003c\/li\u003e \u003cli\u003eLight industrial panels where dependable single-pole protection on dedicated lines is required without affecting other circuits.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eInstallation and lifecycle considerations\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eDesigned for straightforward bolt-on installation in compatible Siemens panelboards and load centers, making replacements fast and reliable.\u003c\/li\u003e \u003cli\u003eThe thermal-magnetic mechanism provides consistent trip performance across varying ambient conditions, reducing the likelihood of inconsistent protection.\u003c\/li\u003e \u003cli\u003eDurable construction supports long service life in environments where panels experience vibration or routine cycling.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy choose the Siemens ED21B045?\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eA purpose-built, OEM-compatible solution that aligns with Siemens panel systems, ensuring cohesive performance and easier upgrades.\u003c\/li\u003e \u003cli\u003eA precise protection strategy that balances fast fault interruption with resistance to nuisance trips, keeping critical loads functional while safeguarding wiring and devices.\u003c\/li\u003e \u003cli\u003eCompact, robust design that supports organized, reliable panel layouts in both new builds and retrofits.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhether you’re wiring a new panel or replacing an aging breaker, the ED21B045 delivers targeted, dependable protection for a wide range of circuits. Its combination of secure mounting, precise thermal-magnetic protection, and OEM compatibility makes it a thoughtful, long-term choice for safeguarding electrical systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349784875170,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-ed21b045-45-a-120-v-1-pole-bolt-on-circuit-breaker-ampstate-688.webp?v=1788724578","url":"https:\/\/www.ampstate.com\/products\/siemens-ed21b045-45a-120v-1-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}