{"product_id":"siemens-jk3b300-300a-3p-600v-circuit-breaker","title":"Siemens JK3B300 Circuit Breaker, 300A, 3-Pole, 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the \u003cstrong\u003eSiemens JK3B300\u003c\/strong\u003e, a rugged \u003cstrong\u003e3-pole circuit breaker\u003c\/strong\u003e engineered for demanding industrial environments. With a \u003cstrong\u003e300 A\u003c\/strong\u003e rating and a \u003cstrong\u003e600 V\u003c\/strong\u003e voltage tolerance, this unit protects heavy-duty feeders, motors, and three-phase distribution panels from overload and fault conditions, keeping critical equipment powered and uptime intact.\u003c\/p\u003e \u003cp\u003eDesigned for \u003cem\u003eservice, maintenance, and replacement\u003c\/em\u003e projects, the JK3B300 delivers reliable protection where it matters most—three-phase power rails in manufacturing floors, process plants, and industrial facilities. Its compact form fits standard Siemens panel bus stabs, enabling smoother upgrades and panel refurbishments with minimal downtime.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 300 A — supports high-current circuits without nuisance trips in normal operation\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3 — ideal for three-phase power distribution and motor circuits\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600 V — suitable for industrial power systems and equipment\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number for compatibility:\u003c\/strong\u003e JK3B300 — verify fit with your specific panel model and application requirements\u003c\/li\u003e \u003cli\u003eReliability: Siemens engineering and rugged construction designed for continuous operation in harsh environments\u003c\/li\u003e \u003cli\u003eMaintenance-friendly: straightforward replacement to minimize downtime during maintenance windows\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eUse cases and scenarios\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eMain service disconnects in industrial facilities needing a robust \u003cstrong\u003e3-phase protection solution\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eProtection for large motors, pumps, conveyors, and other high-demand equipment\u003c\/li\u003e \u003cli\u003eReplacement for worn or obsolete circuit breakers within 3-pole, 600V panels\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy choose this model over generic alternatives? It isn’t just about the numbers. The \u003cstrong\u003eJK3B300\u003c\/strong\u003e combines Siemens’ long‑standing reliability with precise compatibility—when you match the part number to your panel and application, you get consistent performance, predictable trip behavior, and faster service actions.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003ePractical notes\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eNotes: Verify fit by part number and application requirements. Need help matching a part number or confirming compatibility? Our team can assist—share your panel model and system needs, and we’ll help confirm the right model for your setup.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eInstallation and safety considerations\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003ePower down and follow lockout\/tagout procedures before replacing a breaker\u003c\/li\u003e \u003cli\u003eEnsure the breaker aligns correctly with the panel bus and snaps into place securely\u003c\/li\u003e \u003cli\u003eFollow Siemens installation guidelines for torque and mounting; if in doubt, consult a licensed electrician\u003c\/li\u003e \u003cli\u003eAfter installation, test the circuit to confirm proper protection and operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46415703376034,"sku":"JK3B300","price":460.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-jk3b300-circuit-breaker-300a-3-pole-600v-breakers-399.webp?v=1789190390","url":"https:\/\/www.ampstate.com\/products\/siemens-jk3b300-300a-3p-600v-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}