{"product_id":"zinsco-qb243040-circuit-breaker","title":"Zinsco | QB243040 | Circuit Breaker | 3-Pole | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eThe Zinsco QB243040 Circuit Breaker is a purpose-built 3-Pole Bolt-On unit designed for maintenance, retrofit, and replacement projects in compatible electrical panels. When your system requires a precise 3-pole bolt-on solution, this breaker delivers secure mounting and reliable protection that aligns with Zinsco’s legacy design.\u003c\/p\u003e \u003cp\u003eWhy choose this breaker for your panel projects\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e3-Pole bolt-on design\u003c\/strong\u003e provides a robust, secure connection in compatible Zinsco panels, helping ensure dependable operation across the circuit.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number QB243040\u003c\/strong\u003e serves as the most reliable reference for compatibility checks, making sourcing and cross-referencing straightforward during maintenance or upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile for multiple project types\u003c\/strong\u003e—suitable for routine maintenance, retrofit work to bring an older installation up to current needs, or replacement where a matching 3-pole configuration is required.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatibility-driven approach\u003c\/strong\u003e—this unit is designed to match specific panel specifications, so verifying fit and ratings before ordering is essential to a successful install.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cp\u003eElectricians and facilities teams restoring or upgrading Zinsco panels will find the QB243040 particularly valuable for scenarios where a precise 3-pole bolt-on breaker is needed. It’s well-suited for removing a failing breaker and restoring safe, reliable distribution without altering the surrounding panel hardware.\u003c\/p\u003e \u003ch3\u003eHow to ensure a correct fit\u003c\/h3\u003e\n\u003cp\u003eBecause panel compatibility can vary, rely on the part number as your primary reference. Before purchasing, confirm that the panel labeling and required ratings align with QB243040. When in doubt, cross-check the breaker’s 3-pole bolt-on configuration against your panel’s mounting style and the original equipment documentation to avoid mismatches.\u003c\/p\u003e \u003ch3\u003eNotes for installers\u003c\/h3\u003e\n\u003cp\u003eKeep this in your toolkit as a go-to replacement option for Zinsco panels that call for a 3-pole bolt-on breaker. Its straightforward form factor helps streamline installation in retrofit and service scenarios, reducing downtime and easing future maintenance checks.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Zinsco","offers":[{"title":"Default Title","offer_id":46425646530722,"sku":"QB243040","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a085eff1-75dd-47ee-b131-4c8df8f0489b.png?v=1765492976","url":"https:\/\/www.ampstate.com\/products\/zinsco-qb243040-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}