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What prevents an XB5 selector switch operator from rotating under heavy use?

An anti rotation plate ZB5AZ902 is offered as an accessory, which consists of a metal plate mounted between the inside panel cover and the plastic ring nut. The plate bites into the cover surface and is held in place by the nut. The contact blocks and light modules have a key that fits into the nut to prevent loosening.

CTA-ID : 2019479
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