{"product_id":"square-d-9421ll1-400a-circuit-breaker-operating-mechanism","title":"Square D 9421LL1 400A Circuit Breaker Operating Mechanism","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SQUARE D 9421LL1 is an operating mechanism accessory designed for 400-amp molded-case circuit breakers. It provides the mechanical linkage that allows external operation of the breaker, enabling the breaker to be opened or closed from outside an enclosure without direct manual contact with the breaker itself. This component is installed by licensed electricians during panel and switchgear assembly or retrofit work where remote or external breaker operation is required. Key attributes include a 400-amp rating and compatibility with specific SQUARE D breaker families. Packaged as a single unit, it is a direct replacement or field-add accessory for qualifying circuit breaker assemblies.\u003c\/p\u003e\u003cp\u003eThis operating mechanism is intended for use with SQUARE D Q4L, LAL, and LHL series molded-case circuit breakers in commercial and industrial electrical distribution applications. Typical installation scenarios include motor control centers, switchboards, and panelboards where safe external operation of a 400-amp breaker is required. It is suited for both new installation and retrofit applications where an existing breaker requires an operating mechanism added after initial installation.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRated for 400-amp circuit breaker applications\u003c\/li\u003e\n\u003cli\u003eAccessory type: operating mechanism for external breaker actuation\u003c\/li\u003e\n\u003cli\u003eCompatible with Q4L, LAL, and LHL SQUARE D circuit breaker frames\u003c\/li\u003e\n\u003cli\u003ePackaged as a single unit for direct field installation\u003c\/li\u003e\n\u003cli\u003eDimensions of 11.5 inches length, 5.5 inches width, and 8 inches height allow fitment in standard enclosure configurations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with SQUARE D Q4L, LAL, and LHL series molded-case circuit breakers rated at 400 amps.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. The circuit must be fully de-energized and locked out per OSHA lockout\/tagout procedures before installing or servicing any circuit breaker accessory. Verify breaker frame compatibility before mounting the mechanism. Consult the manufacturer installation instructions for proper attachment sequence and hardware requirements.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccessory Type\u003c\/strong\u003e: Operating Mechanism\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage Rating\u003c\/strong\u003e: 400 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Breaker Series\u003c\/strong\u003e: Q4L, LAL, LHL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 11.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 5.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.37 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SQUARE D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 9421LL1\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SCHNEIDER ELECTRIC","offers":[{"title":"Default Title","offer_id":51541370667314,"sku":"9421LL1","price":402.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/841ee5471e66bc369572a7b28931798e_7a8e3d15-2356-433f-814c-712222d54487.jpg?v=1785873845","url":"https:\/\/voomisupply.com\/products\/square-d-9421ll1-400a-circuit-breaker-operating-mechanism","provider":"Voomi Supply","version":"1.0","type":"link"}