Part Number A490-T-DF-M-28 Power Supply in stock with ready to ship. Get an instant quote for Whelen Engineering Company Inc part number A490-T-DF-M-28 by filling form below with your desired order quantity, targeted price and the expected order-fulfilment date. Get instant quote for A490-T-DF-M-28. Our dedicated account manager will get back to you within 15 minutes.