This switchlock is available in three versions, each offering up to 1,000 key combinations. The S202 is a single pole, off/on, two terminal, maintaining type with 90° clockwise rotation and one key entry. The S202A is a single pole, off/on, momentary spring return switchlock. The S202B is a single pole, double throw, on/off/on, 45° clockwise and anti-clockwise rotation and with a choice of key entry/exit configurations.

Series S202 switchlocks have a zinc alloy die-cast housing and cylinder, chrome plated for durability. The terminals are of the solder type and are silver-plated. To comply with CE regulations, this switchlock is rated at less than 50 volts for alternating current and less than 75 volts for direct current.