{"product_id":"siemens-jj3s400v","title":"Siemens JJ3S400V 400A 3-Pole 400 V Circuit Breaker","description":"\u003cdiv\u003eSiemens JJ3S400V 400A 3-Pole 400V Circuit Breaker delivers dependable, three-phase protection for demanding electrical systems. With the precise part number JJ3S400V, this device is built to reliably interrupt fault currents and safeguard both equipment and personnel in industrial environments. Key features and benefits\n- 400A current rating: Acts as the main protection point for heavy three-phase feeders, helping prevent equipment damage from overloads and short circuits.\n- 3-pole design: Simultaneously interrupts all three hot legs, ensuring balanced protection across phases and reducing the risk of uneven fault conditions.\n- 400V voltage rating: Optimized for standard 3-phase 400V electrical networks, providing compatibility with common industrial and commercial installations.\n- Robust Siemens engineering: Backed by Siemens’ proven engineering quality, designed for durable performance in challenging environments and compatible with Siemens panels and accessories. Who it’s for\n- Industrial facilities and manufacturing lines that rely on stable three-phase power distribution.\n- Electrical contractors and facility managers upgrading or replacing main feeders in 3-phase systems.\n- Data centers, HVAC installations, and large commercial locations that require reliable 3-pole protection on 400V networks. Why this model stands out\n- Pure three-phase protection: The 3-pole configuration ensures synchronized disconnection across all phases, which simplifies wiring, reduces fault risk, and supports safer, faster diagnostics during outages.\n- Purpose-built for heavy use: The 400A rating targets robust protection for high-demand circuits, helping minimize downtime and protect valuable equipment.\n- Clear compatibility cues: Designed for 400V three-phase systems, making it a straightforward fit for existing 400V distributions without over-specifying or under-sizing. How to use and install (practical considerations)\n- Verify system voltage and phase count: Ensure your installation is a 3-phase, 400V network to match the JJ3S400V’s specifications.\n- Plan for proper conductor sizing and panel fit: Align connector and busbar compatibility with your Siemens panel or enclosure and follow the manufacturer’s installation guidance.\n- Maintenance mindset: Regularly inspect the breaker during routine electrical maintenance, confirm secure seating and terminations, and replace after any fault event or noticeable wear per your facility policy.\n- Replacement and upgrades: If you’re upgrading from a smaller or single-phase device, this 400A 3-pole model provides parallel protection across all phases, which enhances overall protection strategy for demanding loads. In short, the Siemens JJ3S400V 400A 3-Pole 400V Circuit Breaker is purpose-built for reliable, three-phase protection in demanding 400V environments. It combines a strong current rating with synchronized, multi-phase disconnection to help you protect critical equipment, reduce downtime, and maintain safe electrical operation across your distribution system.\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46423046848674,"sku":"JJ3S400V","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_229276d9-908d-46df-93e5-6fe31866e0ff.png?v=1765492975","url":"https:\/\/www.ampstate.com\/products\/siemens-jj3s400v","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}