{"product_id":"hja36150u31x-square-d-circuit-breaker-i-line-plug-in-150-amp-3-pole-600v","title":"Square D HJA36150U31X Circuit Breaker | 150A 3-Pole 600V I-Line Plug-In","description":"\u003ch2\u003eSquare D HJA36150U31X — 150 Amp 3-Pole I-Line Molded Case Circuit Breaker\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSquare D HJA36150U31X\u003c\/strong\u003e is a heavy-duty, 3-pole molded case circuit breaker engineered for demanding industrial and commercial power distribution applications. Rated at \u003cstrong\u003e150 Amps and 600\/690V AC\u003c\/strong\u003e, this breaker features the proven \u003cstrong\u003eI-Line plug-in connection system\u003c\/strong\u003e for fast, secure installation in compatible Square D I-Line panelboards — with no wiring required on the line side.\u003c\/p\u003e\n\n\u003cp\u003eWith a solid-state trip unit offering \u003cstrong\u003eLong-Time (L) and Instantaneous (I) trip functions\u003c\/strong\u003e, the HJA36150U31X delivers precise, reliable overcurrent protection for motors, feeders, and large electrical loads across industrial environments.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HJA36150U31X\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Square D (Schneider Electric)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmpere Rating:\u003c\/strong\u003e 150A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 600\/690V AC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection Type:\u003c\/strong\u003e I-Line Plug-In\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrip Type:\u003c\/strong\u003e Solid State — LI (Long-Time \/ Instantaneous)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupting Capacity:\u003c\/strong\u003e\n    \u003cul\u003e\n      \u003cli\u003e100 kAIC @ 240V AC\u003c\/li\u003e\n      \u003cli\u003e65 kAIC @ 480V AC\u003c\/li\u003e\n      \u003cli\u003e25 kAIC @ 600V AC\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e HJ Frame\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBreaker Type:\u003c\/strong\u003e Molded Case Circuit Breaker (MCCB)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose the Square D HJA36150U31X?\u003c\/h2\u003e\n\n\u003ch3\u003eI-Line Plug-In Technology\u003c\/h3\u003e\n\u003cp\u003eThe I-Line connection system allows the breaker to plug directly into the bus of an I-Line panelboard or switchboard — eliminating line-side wiring, reducing installation time, and improving system reliability. This makes it ideal for facilities that require frequent circuit reconfigurations or fast breaker replacement.\u003c\/p\u003e\n\n\u003ch3\u003eHigh Interrupting Capacity\u003c\/h3\u003e\n\u003cp\u003eWith up to \u003cstrong\u003e100kAIC at 240V\u003c\/strong\u003e, this breaker is built to safely interrupt fault currents in high-energy distribution systems — protecting equipment, personnel, and infrastructure from arc flash and short-circuit damage.\u003c\/p\u003e\n\n\u003ch3\u003eSolid-State Precision\u003c\/h3\u003e\n\u003cp\u003eUnlike thermal-magnetic designs, the solid-state LI trip unit provides consistent and adjustable protection thresholds — reducing nuisance trips while maintaining tight overcurrent coordination across complex power systems.\u003c\/p\u003e\n\n\u003ch3\u003eVersatile Industrial Applications\u003c\/h3\u003e\n\u003cp\u003eThe HJA36150U31X is suited for use in:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIndustrial manufacturing facilities\u003c\/li\u003e\n  \u003cli\u003eCommercial buildings and data centers\u003c\/li\u003e\n  \u003cli\u003eMotor control centers (MCCs)\u003c\/li\u003e\n  \u003cli\u003eElectrical switchgear and distribution panels\u003c\/li\u003e\n  \u003cli\u003eOil \u0026amp; gas, utilities, and heavy industry\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat does HJA36150U31X mean?\u003c\/h3\u003e\n\u003cp\u003eThe part number breaks down as follows: \u003cstrong\u003eHJ\u003c\/strong\u003e = HJ frame class, \u003cstrong\u003eA\u003c\/strong\u003e = I-Line plug-in, \u003cstrong\u003e3\u003c\/strong\u003e = 3 poles, \u003cstrong\u003e6\u003c\/strong\u003e = 600V, \u003cstrong\u003e150\u003c\/strong\u003e = 150 Amp rating, \u003cstrong\u003eU31X\u003c\/strong\u003e = solid-state LI trip unit configuration.\u003c\/p\u003e\n\n\u003ch3\u003eIs this breaker compatible with Square D I-Line panelboards?\u003c\/h3\u003e\n\u003cp\u003eYes. The HJA36150U31X is designed specifically for use with Square D I-Line-style panelboards and switchboards that accept HJ frame plug-in breakers.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the difference between LI and LSI trip functions?\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eLI\u003c\/strong\u003e (Long-Time \/ Instantaneous) provides two zones of protection: sustained overload (long-time) and immediate response to high short-circuit currents (instantaneous). \u003cstrong\u003eLSI\u003c\/strong\u003e adds a Short-Time delay zone for better coordination in cascaded systems.\u003c\/p\u003e\n\n\u003ch3\u003eCan this breaker be used as a motor disconnect?\u003c\/h3\u003e\n\u003cp\u003eYes, when properly sized and applied per NEC requirements, a 150A molded case circuit breaker can serve as both overcurrent protection and disconnect means for large motor feeders.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the warranty or return policy?\u003c\/h3\u003e\n\u003cp\u003ePlease contact our team directly for warranty details and return eligibility. All products are inspected before shipment.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\u003cem\u003eAlpha Brokers \u0026amp; Controls specializes in new, surplus, and hard-to-find electrical components from top manufacturers like Square D (Schneider Electric). Need help finding a compatible breaker or panelboard? Contact our team for expert support.\u003c\/em\u003e\u003c\/p\u003e","brand":"Square D \/ Schneider Electric","offers":[{"title":"New","offer_id":48396208701688,"sku":"HJA36150U31X-N","price":1199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/1209\/3176\/files\/Photoroom_20260218_112017.jpg?v=1778795207","url":"https:\/\/alphabreakersandcontrols.com\/products\/hja36150u31x-square-d-circuit-breaker-i-line-plug-in-150-amp-3-pole-600v","provider":"Alpha Breakers \u0026 Controls","version":"1.0","type":"link"}