{"product_id":"siemens-3va9978-0aa21-6a-600v-switch","title":"Siemens 3VA9978-0AA21 6A 600V Switch, Auxiliary Switch | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens \u003cstrong\u003e3VA9978-0AA21\u003c\/strong\u003e — a purpose-built auxiliary switch designed for precise \u003cem\u003emanual control\u003c\/em\u003e and reliable switching within your control panels. This compact auxiliary contact module works seamlessly with Siemens main switching devices, delivering dependable signaling for control circuits, interlocks, and sequence control you rely on every day.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eKey specs\u003c\/strong\u003e\u003cbr\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 3VA9978-0AA21\u003cbr\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 6 A\u003cbr\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600 V\u003c\/p\u003e \u003cp\u003eWhy this matters for retrofit and maintenance planning:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eConsistent part number distribution\u003c\/strong\u003e keeps maintenance logs and spare inventories standardized, reducing downtime during replacements.\u003c\/li\u003e \u003cli\u003eDesigned for \u003cstrong\u003emanual control and auxiliary signaling\u003c\/strong\u003e, enabling clear status feedback and safer operation in control circuits.\u003c\/li\u003e \u003cli\u003eIdeal for \u003cstrong\u003eretrofit projects\u003c\/strong\u003e where you must preserve the exact component ID to fit existing harnesses and panel layouts.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003ePractical use cases you’ll appreciate:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eUpgrading aging control panels without re-engineering control logic — simply swap in the 3VA9978-0AA21 and maintain established interlock and signaling routines.\u003c\/li\u003e \u003cli\u003eStocking a reliable spare in maintenance programs to minimize downtime when auxiliary contacts wear or fail.\u003c\/li\u003e \u003cli\u003eEnsuring consistent control sequences in automation setups that depend on dependable auxiliary contact feedback.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhat makes this auxiliary switch stand out:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eSiemens engineering you can trust for long-term performance in industrial, commercial, and process environments.\u003c\/li\u003e \u003cli\u003eClear alignment with existing Siemens equipment, helping you avoid compatibility surprises during service events.\u003c\/li\u003e \u003cli\u003eAvailability through AmpState, supporting quick procurement and dependable supply chains for plant readiness.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIf you’re uncertain about fit or compatibility with your Siemens panel, AmpState offers expert assistance to verify the part number against your equipment and control scheme, ensuring you receive a precise match the first time.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46413700792482,"sku":"3VA9978-0AA21","price":575.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_513d6710-3734-4b27-839d-f68e6f4b470a.png?v=1765492974","url":"https:\/\/www.ampstate.com\/products\/siemens-3va9978-0aa21-6a-600v-switch","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}