The 59M18-04A20N is a Series 59 multi-deck rotary switch designed for applications requiring compact switching with high current capacity. This switch features a 1.125" diameter body with an 18° angle of throw and fixed stops, utilizing solder lug terminals for reliable connections. The unit is military-qualified per MIL-DTL-3786/36 and incorporates a gold-plated contact system compatible with logic circuitry, supporting up to 4 decks with 5 poles per deck and up to 20 positions per pole. The switch is rated for 1/4 amp operation and is available in military style (M) or military-qualified shaft/panel seal (HS) configurations. These switches are ideal for aerospace, defense, and industrial control applications where compact size, reliability, and switching precision are critical requirements.