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What is the difference between the door interlock plate and the door mounting plate for the Vario?

The door interlock plate provides for door interlocking. This interlocks the handle on the door with the switch body so that the door can only be opened with the handle in the Off position. The door mounting plate will attach the handle operator to the door but does not provide the interlock option so the door can be opened even with the switch in the On position.

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