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January 2010

To our valuable customers

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Temporary Deviation: Notification of removal of UL recognition mark on 154 series

Littelfuse Inc., regrets to inform you that the Nano 154 Series Omni-Blok® products with

manufacturing date code on or after Nov 9, 2009 has been shipped incorrectly with the UL

recognition logo on the product labels.

As a result of a change by UL on the regulation of the plastic material used in the 154 Series

holder, the UL approval for this product has been suspended temporarily. Effective Nov. 2009,

UL has mandated that all plastic material used in fuseholders have certain flammability rating.

Previously, this was a requirement for fuses only and not the associated fuseholder.

As a result, the fuseholder used in the 154 Series Omni-Blok® was no longer UL approved and

the UL recognition logo should have been removed from all product labels with date code on

or after Nov 9, 2009.

It is important to note that the performance and material of the product remain unchanged and

that UL suspension is only applicable to the fuseholder. The 451/452/453/454 Series fuse that

is used in the 154 Series Omni-Blok® remain UL approved.

We are working on obtaining UL approval for the 154 Series Omni-Blok® with a new plastic

material for the fuse holder. The removal of UL recognition mark is a temporary deviation. We

will implement the new plastic material and apply back the UL recognition mark on 154 series

as soon as we get UL’s approval.

We apologize in advance for any inconvenience that this has caused. Please contact your local

Littelfuse representative if you have any additional questions.

Thank you for your continued support.

Best Regards,

Matthew Chan

Global Product Manager

Littelfuse HK, Ltd.

T. +852 2154-7777

F. +852 2810-5500

M. +852 9832-2309

HTU

mchan@littelfuse.com

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