{"product_id":"siemens-e21b030-circuit-breaker","title":"Siemens | E21B030 | Circuit Breaker | 30A | 1-Pole | 120V | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens E21B030—a dependable 30A, 1-pole, 120V bolt-on circuit breaker designed for maintenance, retrofit, and replacement projects where exact compatibility matters. Built by Siemens, this part is purpose-built to deliver reliable overcurrent protection for single‑phase circuits in compatible panels.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 30 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 1-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 120 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e E21B030\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this breaker matters\u003c\/h3\u003e\n\u003cp\u003eThe E21B030 combines Siemens engineering with a robust bolt-on design, offering a secure, screw-secured connection ideal for panels that require proven mechanical stability. Its 30A rating ensures appropriate protection for dedicated 120V circuits—think lighting, outlets, and other critical branch circuits in residential or light commercial settings—without unnecessary tripping on normal startup surges.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eReplacement for aging or damaged 30A single-pole breakers in compatible Siemens panels\u003c\/li\u003e \u003cli\u003eRetrofit projects where a bolt-on solution is required for a secure, vibration-resistant install\u003c\/li\u003e \u003cli\u003eMaintenance tasks that demand a genuine Siemens part with matching electrical specs\u003c\/li\u003e \u003cli\u003eSingle-pole protection for 120V circuits such as lighting runs, receptacle lines, and controlled equipment\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eCompatibility \u0026amp; installation tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eVerify fit:\u003c\/strong\u003e Confirm that your panel accepts bolt-on, 1-pole, 30A, 120V breakers and that E21B030 matches the existing specifications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReference part number:\u003c\/strong\u003e Use E21B030 as the primary reference for compatibility and ordering.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer guidance:\u003c\/strong\u003e Before purchasing, check panel documentation or consult a licensed electrician to ensure proper fit and safe installation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInstallation note:\u003c\/strong\u003e Follow standard bolt-on mounting procedures and ensure a secure connection to maintain electrical safety and reliable operation.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eChoosing a genuine Siemens component like the E21B030 helps maintain consistent protection across your electrical system, reduces the risk of nuisance trips, and simplifies future maintenance with a part designed to align with your existing panel architecture. If you’re upgrading or replacing a 30A, 120V single-pole circuit in a compatible panel, the Siemens E21B030 provides a straightforward, dependable path to restored safety and performance.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46427285323938,"sku":"E21B030","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-e21b030-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}