{"product_id":"siemens-qj3b090-circuit-breaker","title":"Siemens | QJ3B090 | Circuit Breaker | 90A | 3-Pole | 240V","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing Siemens QJ3B090, a dependable 90A, 3-Pole, 240V circuit breaker designed for maintenance, retrofit, and replacement tasks where matching specs truly matter. This unit is built to align with Siemens’ QJ-series, ensuring reliable protection and a precise fit in compatible panels.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 90A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 240V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e QJ3B090\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this matters for your electrical system: selecting the exact part number guarantees you’re getting a breaker that matches the mechanical form and protective characteristics required by your Siemens panel. The QJ3B090 is specifically designed to slot into Siemens equipment that expects QJ-series breakers, helping you avoid compatibility hiccups during critical maintenance or retrofit work.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eUse cases\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eRoutine maintenance outages where a known-good replacement is needed\u003c\/li\u003e \u003cli\u003eRetrofit projects upgrading aging or obsolete breakers in existing Siemens installations\u003c\/li\u003e \u003cli\u003eEmergency replacements to quickly restore power while maintaining circuit protection integrity\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eCompatibility and installation notes\u003c\/strong\u003e: Always confirm fit and ratings before ordering. The part number QJ3B090 is the most reliable reference for compatibility with your specific Siemens panel and its current requirements.\u003c\/p\u003e \u003cp\u003eWho benefits most: electrical contractors, facilities managers, and maintenance teams responsible for Siemens-distributed electrical systems in commercial or light industrial environments. If your system specifies a 90A, 3-Pole, 240V Siemens breaker, the QJ3B090 is the precise, ready-to-install choice that minimizes downtime and preserves system protection.\u003c\/p\u003e \u003cp\u003ePractical tips for best results: keep a spare QJ3B090 on hand for planned maintenance and use only in panels that require the QJ-series form factor. This reduces service time and ensures consistent protection across your distribution network.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46427420065954,"sku":"QJ3B090","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-qj3b090-circuit-breaker-90a-3-pole-240v-132.webp?v=1789720803","url":"https:\/\/www.ampstate.com\/products\/siemens-qj3b090-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}