Primary/Secondary Latch Switches; Short Switch - Panasonic Microwave Ovens with Inverters Technical Manual

Primary / secondary latch switches
These are safety switches, and their basic function is to interrupt the power
supply to the magnetron when the door starts to open. They are open when the
door is opened.
Switch
Primary
Secondary

Short switch

This switch is used to prevent the operation of the microwave oven while the
door is opened.
The short switch creates a short circuit to blow the line fuse and stop microwave
oven's operation if the door switches fail to open when the door is opened.
This switch is normally open when the door is closed.
Note: When the fuse is blown due to operation of the short switch, replace the
primary switch, the short switch, the secondary switch, and the power relay.
Switch position
Door Opened
Open
Open
Table 1
Switches Location
Primary Switch
Side view of Microwave Oven
Short Switch (Lower)
Secondary Switch (Upper)
Figure 6
6
Door Closed
Close
Close