The S12B 3-Conductor 0.206” ID Open Frame Jack from Switchcraft is used with the applications requiring polarization (use of plugs of different sizes) to prevent insertion of incorrect equipment. It features a nickel-plated copper alloy mounting bushing and rigid plastic insulation.
Switchcraft S12B Specs
Contact Resistance: .030 ohms maximum (initial), .050 ohms maximum (after humidity, durability exposure). Per MIL-STD-202E