This switchlock is available in two versions, each offering up to 1,000 key combinations. The S206A is a double pole, 2-off/2on maintaining type. The S206B is a double pole, changeover, maintaining type, which can be used in two circuit configurations. The outer body is chrome plated for durability.

Series S206 switchlocks have a zinc alloy die-cast housing and centre as standard. The key movements are 90° turn only with either single position or two position key entry. 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.