In what order should the Selector and Key switch be operated?

The most effective order for operating the Selector and Key switch is to first place the number onto the toggle Selector, followed by inserting and turning the key. This sequence is important because the Selector often determines the operational mode or function of the device, ensuring that it is correctly set before activating it with the key.

By adjusting the Selector first, the device is prepared for correct operation, thereby aligning with safety protocols and operational requirements. Turning the key without first ensuring the Selector is correctly set could lead to undesirable or unsafe states in the equipment or control system.

In contrast, if you operate the key before the Selector or solely focus on either component without respect to their interdependence, you risk misconfiguration, which could cause operational errors or even equipment damage. Therefore, placing the number on the Selector ensures that you are initiating the device in the correct mode prior to activation with the key.