Which magnetic switch configuration is identified as open loop?

The correct identification of the open loop magnetic switch configuration is Form B. In the context of magnetic switches, an open loop configuration typically refers to a setup where the circuit remains open until activated by the presence of a magnetic field. Specifically, Form B switches are designed to remain in a non-conductive state (open) when no magnetic action is applied.

When a magnet approaches the switch, it changes the state of the circuit, causing it to close and allowing current to flow. This kind of operation is crucial in security and monitoring systems, where detecting the opening or closing of doors, windows, or other barriers is necessary.

The other configurations, while similar, operate differently and do not represent the open loop setup. Understanding these configurations helps in designing more effective security systems and intrusion detection mechanisms.