{"product_id":"zinsco-qb40-circuit-breaker","title":"Zinsco | QB40 | Circuit Breaker | 1-Pole | 120V | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing the Zinsco QB40 1-Pole 120V Bolt-On circuit breaker — a purpose-built solution for maintenance, retrofit, and replacement tasks where exact specs matter. Identified by the QB40 part number, this breaker is designed to match the form and function of compatible Zinsco panels, restoring reliable overcurrent protection quickly and confidently.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSingle-pole, 120-volt operation:\u003c\/strong\u003e Protects a dedicated branch circuit with straightforward, reliable trip behavior.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBolt-On mounting:\u003c\/strong\u003e Secure, tool-friendly installation that maintains solid electrical contact in the panel.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart-number-driven compatibility:\u003c\/strong\u003e Use QB40 as the best reference to ensure a correct fit with your panel and hardware.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIdeal for maintenance, retrofit, and replacement:\u003c\/strong\u003e Perfect when upgrading or restoring older electrical systems that require this exact specification.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAuthentic Zinsco design alignment:\u003c\/strong\u003e Engineered to meet the brand’s safety and performance expectations for 1-pole 120V circuits.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWho this is for: electricians, facility maintenance teams, and electrical contractors working on Zinsco panel systems that require a precise QB40 replacement. Use cases range from service calls to panel retrofits where downtime matters and you need a reliable, compatible breaker on hand.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eHow to ensure you get the right part:\u003c\/strong\u003e Before ordering, directly compare your panel’s labeling to confirm compatibility. The QB40 part number is your strongest reference, but always verify voltage (120V) and pole configuration (1-Pole) match your circuit requirements. This breaker is intended for 1-pole 120V circuits in compatible Zinsco panel assemblies and should be installed by qualified personnel.\u003c\/p\u003e \u003cp\u003eKey specs at a glance:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePole configuration:\u003c\/strong\u003e 1-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 120V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBrand\/series:\u003c\/strong\u003e Zinsco QB40\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e QB40 part number for compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Zinsco","offers":[{"title":"Default Title","offer_id":46427399520418,"sku":"QB40","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/zinsco-qb40-circuit-breaker-1-pole-120v-bolt-673.webp?v=1789716457","url":"https:\/\/www.ampstate.com\/products\/zinsco-qb40-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}