{"product_id":"siemens-mbk125a-main-breaker-kit-secure-packaging","title":"MBK125A | Siemens Type EQ Low Voltage 2-Pole 125A 120\/240V Thermal Magnetic Main Breaker Kit","description":"\u003ch4\u003eDescription\u003cstrong\u003e \u003c\/strong\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe Siemens MBK125A is a molded case main breaker kit designed for low-voltage residential and light commercial panel conversions. Rated for 120\/240 VAC operation with a 125-amp capacity, it provides dependable overcurrent protection and system isolation.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable style=\"width: 99.9458%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eSiemens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eCircuit Breaker\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eMBK125A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eMolded Case Circuit Breaker\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eType EQ Low Voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eVoltage Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003e120\/240 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eAmperage Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003e125 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eInterrupt Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003e22 kA @ 240 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eTrip Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eThermal Magnetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eNumber of Poles\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003ePhase\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eMounting Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eBolt-On \/ Panel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003e5.6 in L × 4.5 in W × 3.7 in H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eMain breaker conversion for residential\/light commercial panels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 24.1872%;\"\u003e\u003cstrong\u003eBreaker Function\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 75.4608%;\"\u003eMain Disconnect and Overcurrent Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eInformation About MBK125A\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe MBK125A is a main breaker conversion kit developed by Siemens for Type EQ low-voltage panelboard applications. Supporting 125-amp operation at 120\/240 VAC, it provides reliable system protection while enabling convenient upgrades or replacements in existing load centers. Its thermal magnetic trip characteristics ensure accurate response to both overloads and short-circuit conditions, helping maintain electrical safety in residential and commercial installations. With a 22 kA interrupt capacity at 240 VAC and a bolt-on\/panel mounting configuration, the MBK125A integrates securely into compatible assemblies while offering durable and dependable protection capabilities.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e125-amp main breaker: Supports residential and light commercial panel conversion needs.\u003c\/li\u003e\n\u003cli\u003eThermal magnetic trip: Delivers long-time overload and instantaneous short-circuit response.\u003c\/li\u003e\n\u003cli\u003e22 kA interrupt rating: Provides strong fault-clearing capability at 240 volts.\u003c\/li\u003e\n\u003cli\u003eType EQ compatibility: Designed specifically for Siemens low-voltage panel systems.\u003c\/li\u003e\n\u003cli\u003eBolt-on\/panel mounting: Ensures secure installation and stable electrical connections.\u003c\/li\u003e\n\u003cli\u003eTwo-pole configuration: Supports single-phase power distribution applications.\u003c\/li\u003e\n\u003cli\u003eCompact dimensions: Fits standard panel layouts with minimal adjustment.\u003c\/li\u003e\n\u003cli\u003eDurable molded case construction: Engineered for long-term reliability in service environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe MBK125A delivers the reliability and precision required for safe, effective conversion and protection of single-phase low-voltage electrical panels.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":48564334002474,"sku":"MBK125A","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/MBK125A.webp?v=1716885870","url":"https:\/\/iqelectro.com\/products\/siemens-mbk125a-main-breaker-kit-secure-packaging","provider":"IQElectro","version":"1.0","type":"link"}