Key Selector Short Profile Switch, 2-Position Maintained, 22mm

This is a 22mm key selector switch. They are one of the shortest illuminated 22.5 mm switches on the market. The depth behind the panel is 48 mm (1.88").

Mounting Cutout: 7/8" in (22.5 mm) Diameter
Length Behind the Mounting Panel: 48 mm  (1.88")
Operation Current Rating: 10A at 120 VAC or 240 VAC
Mechanical Life: 1,000,000 Cycles

Two block configurations are available:
1) Maintained two normally open (NO) block, 2 positions.
2) Maintained one normally closed (NC) block and one normally open (NO) block, 2 positions.

For 2NO option, it allows you to keep all two channels either open or closed.
Selector Position 1: keep Channel 1 open and Channel 2 open.
Selector Position 2: keep Channel 1 closed and Channel 2 closed.

For 1NO 1NC option, it allows you to keep one of the two channels closed and the other one open.
Selector Position 1: keep Channel 1 closed and Channel 2 open.
Selector Position 2: keep Channel 1 open and Channel 2 closed.

Additional blocks can be added to switch more pairs of wire.  See the BK-SW15 of the additional block. Whether the block is a NO or a NC block is printed on the side of its block. This can also be identified by looking at the bottom of the block. A green round dot indicates a NO block; a red round dot indicates a NC block. 

Here is an example, SW23 Key Switch is used on our Brew Buddy Control Panel (Top left one).