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Why does the contactor open when using VLR on the C445?

The C445 is designed to maintain the appropriate status of the control contact(s) of the C445 base module. If the event falls into the VLR Auto range, the contactor may or may not stay closed. This is dependent on the characteristics of the contactor and its power feed. If the event falls into the VLR Short or VLR Long range, contactors will typically open and then reclose as commanded by the contacts of the C445 base module.