The mechanical device, either fused or non-fused, located adjacent to an electrical appliance (H V A C usually) that can totally disconnect the electrical current separate from the load center breakers
If you disconnect something from something else, you separate the two things. He disconnected the IV bottle from the overhead hook. connect. when two people or groups no longer understand or have a relationship with each other
The concept of disconnect-reconnect is what allows SCSI to be multi-tasking or multi-threaded Disconnect is the process of a target (or initiator) disconnecting from the bus when it experiences a delay in completing a task so that another SCSI device can make use of the bus Also see "reconnect"