{"product_id":"siemens-ngb2b045b-45a-600v-2-pole-bolt-on-circuit-breaker","title":"Siemens NGB2B045B - 45 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens NGB2B045B is a 2-pole bolt-on molded case circuit breaker engineered to safeguard branch circuits with dependable overcurrent and short-circuit protection. Rated for 45A and up to 600V, it’s built to perform reliably in panelboards and load centers across residential, commercial, and light industrial environments.\u003c\/p\u003e \u003ch3\u003eWhy this breaker stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection, reducing the risk of loose terms or connection movement in demanding install environments.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by combining overload (thermal) protection with fast magnetic response to short-circuits, helping to minimize nuisance trips and safeguard equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e is optimized to fit matching Siemens load centers and panelboards, ensuring proper mechanical fit and electrical coordination.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suited for a wide range of installations—from home electrical panels to light commercial and industrial panels—where robust branch-circuit protection is needed.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDurable construction\u003c\/strong\u003e and molded-case insulation for long-lasting performance in everyday electrical systems.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eKey specifications\u003c\/h3\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 NGB2B045B\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 rating:\u003c\/strong\u003e 45 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 2\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting style:\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 \u003ch3\u003ePractical use cases\u003c\/h3\u003e\n\u003cp\u003eInstall the NGB2B045B in panelboards or load centers to protect feeders and branch circuits serving HVAC equipment, lighting, receptacle circuits, small motors, and other steadily loaded loads. Its 2-pole design is ideal for 240V circuits or paired hot conductors common in modern residential and light commercial electrical systems.\u003c\/p\u003e \u003ch3\u003eInstallation and maintenance tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEnsure the breaker is paired with a compatible Siemens panelboard for optimal fit and trip coordination.\u003c\/li\u003e \u003cli\u003eMount using the bolt-on method to secure a solid bus connection; verify torque and seating per panel specifications to maintain reliability in vibrations or temperature cycling.\u003c\/li\u003e \u003cli\u003eUse as part of a well-coordinated protection scheme—pair with appropriately rated upstream devices and downstream branch protections to optimize selectivity and safety.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith its robust bolt-on mounting, precise thermal-magnetic protection, and OEM compatibility, the Siemens NGB2B045B 45A 600V 2-pole breaker is a dependable choice for ensuring safe, reliable power distribution across residential, commercial, and light industrial panels.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355137921186,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens_breaker_and_panel_d77d8aa4-f7f9-4c59-905c-bf25f37b852a.png?v=1764689570","url":"https:\/\/www.ampstate.com\/products\/siemens-ngb2b045b-45a-600v-2-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}