{"product_id":"advance-transformer-71a6091-autotransformer-ballast","title":"Advance Transformer 71a6091 Autotransformer Ballast","description":"\u003cdiv\u003e\u003cp\u003eThe Advance Transformer 71A6091 CW autotransformer ballast is a metal-halide ballast designed for a 400W ANSI M59 lamp. It uses a constant-wattage autotransformer (CW) topology and is compatible with 120\/277V AC supply. The 71A6091 designation sits in the 400W M59 ballast family (MH BAL 400W M59) and is referenced alongside other 71A60x models in Philips\/Signify’s Advance ballast catalogs, indicating interchangeability within the same specification family. This ballast supports a 400W metal-halide lamp and is intended for luminaires that require the CW autotransformer approach to regulate current and maintain light output across the applicable input voltage range. When sourcing a replacement, verify that the fixture’s ballast footprint, lamp type (M59), and electrical input (120\/277V) match the 71A6091’s specifications to ensure compatibility and safe operation.\u003c\/p\u003e\u003c\/div\u003e","brand":"Advance","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51657029157166,"sku":null,"price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_1e2345c6-c8fa-413b-9136-acdc013bc7bd.jpg?v=1769465352","url":"https:\/\/plgautomation.com\/products\/advance-transformer-71a6091-autotransformer-ballast","provider":"PLG Automation ","version":"1.0","type":"link"}