High voltage Ballast protection

2Confidential and Proprietary to Littelfuse, Inc. © 2006 Littelfuse, Inc. All rights reserved.

Electronic Ballast for Fluorescent LightingFluorescent-Lamp Ballast UL935

Primary Voltage Rating of Ballast:

477 series

477 series

3Confidential and Proprietary to Littelfuse, Inc. © 2006 Littelfuse, Inc. All rights reserved.

Electronic Ballast for Fluorescent Lighting477series (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

4Confidential and Proprietary to Littelfuse, Inc. © 2006 Littelfuse, Inc. All rights reserved.

Electronic Ballast for Fluorescent Lighting477series 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)