{"product_id":"siemens-ed21b030-30a-120v-1-pole-bolt-on-circuit-breaker","title":"Siemens ED21B030 - 30 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens ED21B030—a 30A, 120V, 1-pole bolt-on molded case circuit breaker engineered to protect branch circuits in panelboards and load centers with consistent, dependable performance.\u003c\/p\u003e \u003ch3\u003eWhat makes this breaker stand out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e delivers a rigid, vibration-resistant bus connection, minimizing looseness and arc risk in busy electrical environments.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection—responding to overloads with a precise thermal mechanism and handling short circuits with an instantaneous magnetic response.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e1-pole, 30A, 120V\u003c\/strong\u003e configuration is ideal for standard single-phase circuits common in homes and light commercial spaces, delivering targeted protection where it’s needed most.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e OEM-friendly compatibility\u003c\/strong\u003e works seamlessly with matching Siemens OEM load centers and panelboards, ensuring proper fit, interchangeable protection, and reliable operation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial environments—whether upgrading an existing panel or configuring a new distribution setup.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy you’d use the ED21B030\u003c\/h3\u003e\n\u003cp\u003eWhen you need dependable branch circuit protection for 120V circuits, the ED21B030 delivers predictable performance with every trip. Its bolt-on design makes installation in compatible panelboards straightforward and secure, reducing the chance of loose connections that can lead to nuisance trips or electrical noise. The thermal-magnetic protection curve is well-suited for everyday loads and occasional surges, helping to protect wiring, devices, and occupants alike.\u003c\/p\u003e \u003ch3\u003eTechnical specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e ED21B030\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 30A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 120V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 1\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 in panelboards and load centers\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eResidential panel upgrades to improve protection on individual 120V branch circuits\u003c\/li\u003e \u003cli\u003eNew construction or retrofit projects in garages, workshops, and small commercial spaces\u003c\/li\u003e \u003cli\u003eLight industrial applications where reliable, easy-to-service protection is essential\u003c\/li\u003e \u003cli\u003eSystems requiring compatibility with Siemens OEM load centers and panelboards for seamless integration\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIn short, the Siemens ED21B030 is a purpose-built solution for safe, reliable, and maintainable circuit protection. Its combination of secure mounting, precise thermal-magnetic protection, and OEM compatibility makes it a practical upgrade or replacement choice for professionals and informed DIYers alike.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46349784645794,"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_1c767bed-96b7-40ad-86a5-86a41a5e58dc.png?v=1764156609","url":"https:\/\/www.ampstate.com\/products\/siemens-ed21b030-30a-120v-1-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}