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What is the difference between ZB4 and ZB5 lines?

What is the difference between ZB4 and  ZB5 lines?

Product Line:
Harmony Push Buttons

Harmony 22mm

Product Features

The ZB4 is a metal line and ZB5 is a plastic line. They use the same contact blocks and light modules, but they use different mounting collars. ZB4BZ009 is for the metal line and is a metal collar with a single screw, and the ZB5AZ009 is a plastic collar that snaps onto the operators. They are not interchangeable.

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