{"product_id":"siemens-5sy4340-7","title":"Siemens 5SY4340-7 40A 3-Pole 400 V Circuit Breaker","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eSiemens 5SY4340-7\u003c\/strong\u003e is a 40 A, 3-pole, 400 V circuit breaker designed for robust protection of three-phase electrical circuits. Built to integrate with Siemens distribution systems, this unit carries the part number 5SY4340-7 and is ready to drop into compatible panels and switchgear.\u003c\/p\u003e \u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cp\u003eAs a three-pole circuit breaker, it interrupts all three live conductors simultaneously, ensuring balanced protection across the three phases in commercial and industrial settings. With a 400 V rating, it is suitable for typical European and many global three-phase installations that operate at 400 V line-to-line.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCurrent rating:\u003c\/strong\u003e 40 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 400 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 5SY4340-7\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy choose this Siemens breaker?\u003c\/h3\u003e\n\u003cp\u003eReliability and consistency come standard when you choose a Siemens 5SY series device. This breaker is designed to fit Siemens-compatible enclosures and distribution boards, helping you maintain a clean, organized protection scheme. It supports safe, predictable tripping behavior in the event of overloads or short circuits on a 3-phase circuit, reducing risk of damage to motors, pumps, and control equipment.\u003c\/p\u003e \u003ch3\u003eUse cases and applications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eThree-phase feeders in industrial panels, machine rooms, and commercial electrical rooms\u003c\/li\u003e \u003cli\u003eProtection for motors and equipment powered from 400 V three-phase systems\u003c\/li\u003e \u003cli\u003eReplacement or upgrade of existing 3-pole protections in Siemens panel lines\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTips for installation and maintenance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEnsure panel compatibility: verify mounting style and busbar connection in your Siemens distribution board.\u003c\/li\u003e \u003cli\u003eLabel the circuit clearly with the 5SY4340-7 part number for future maintenance and audits.\u003c\/li\u003e \u003cli\u003eKeep spare 5SY4340-7 units on hand to minimize downtime during replacements in critical systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46423590338722,"sku":"5SY4340-7","price":444.0,"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-5sy4340-7","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}