High voltage Ballast protection

2 Confidential and Proprietary to Littelfuse, Inc. © 2006 Littelfuse, Inc. All rights reserved. Electronic Ballast for Fluorescent Lighting Fluorescent-Lamp Ballast UL935 Primary Voltage Rating of Ballast: 477 series

3 Confidential and Proprietary to Littelfuse, Inc. © 2006 Littelfuse, Inc. All rights reserved. Electronic Ballast for Fluorescent Lighting 477series (500Vac/600Vac-rated) Littelfuse designed solution for 600Vac Ballast 600Vac-rated fuse (up to 5A inclusive) o 500Vac-rated for ratings above 6.3A 5X20mm size Both IEC and UL agency approvals

4 Confidential and Proprietary to Littelfuse, Inc. © 2006 Littelfuse, Inc. All rights reserved. Electronic Ballast for Fluorescent Lighting 477series 600Vac Application 1: 600Vac Primary Protection for Ballast Problem: The highest primary voltage rating of ballast is 440Vac to 600Vac, which request the protection device fuse’s voltage rating to be 600Vac. New solution: 477series (600Vac Parameter)