{"product_id":"square-d-999370-circuit-breaker","title":"Square D | 999370 | Circuit Breaker | 70A | 3-Pole | 600V | 10kA | Bolt-On","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D 999370 Circuit Breaker — a 70 Amp, 3-Pole, bolt-on protection device engineered for demanding 600V electrical systems and a 10kA interrupting capacity. This model is designed for maintenance, retrofit, and replacement tasks where exact specs matter, making it a dependable choice in commercial and industrial panels.\u003c\/p\u003e \u003cp\u003eKey attributes include a robust bolt-on mounting for a solid, vibration-resistant connection, three-phase protection, and a 70A rating that aligns with common branch-circuit and feeder protection needs in 3-phase installations.\u003c\/p\u003e \u003cp\u003eWhy choose this Square D breaker? It’s built to endure frequent switching in demanding environments while delivering precise tripping performance when faults occur. The 600V rating enables safe operation across higher voltage panels, and the 10kA interrupting capacity provides a generous safety margin for fault currents. The part number 999370 is your most reliable reference for compatibility.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 70 A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterrupting capacity:\u003c\/strong\u003e 10 kA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 999370\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Square D\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eUse case and ideal applications\u003c\/h3\u003e\n\u003cp\u003eThis breaker is ideal for retrofit projects in existing Square D panels that require a 3-pole, 70A device, as well as maintenance or replacement in facilities with high electrical demand—think commercial buildings, manufacturing floors, and data centers where reliable 3-phase protection is essential.\u003c\/p\u003e \u003ch3\u003eWhat sets it apart\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBolt-On mounting provides a secure, field-replaceable solution for compatible panels.\u003c\/li\u003e\n\u003cli\u003e3-Pole configuration protects all three phases, simplifying wiring and panel organization.\u003c\/li\u003e\n\u003cli\u003e600V rating expands the range of compatible equipment, while the 10kA interruption capacity offers strong protection against short-circuit events.\u003c\/li\u003e\n\u003cli\u003ePart number accuracy: 999370 ensures you’re selecting the exact device needed for proper fit and ratings.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003ePractical tips for installation and compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAlways verify fit and ratings before ordering. The part number 999370 is the best reference for compatibility.\u003c\/li\u003e\n\u003cli\u003eEnsure your panel supports bolt-on breakers and that there is space for a 3-pole device.\u003c\/li\u003e\n\u003cli\u003eMatch the amperage and voltage to the protected circuit and confirm the panel’s bus configuration to prevent misfit.\u003c\/li\u003e\n\u003cli\u003eFollow manufacturer torque specifications and safety guidelines during installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46424416583842,"sku":"999370","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-999370-circuit-breaker-70a-3-pole-600v-10ka-bolt-135.webp?v=1789355725","url":"https:\/\/www.ampstate.com\/products\/square-d-999370-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}