DIN 43650A (ISO 4400) plugs with 18mm contact spacing. Also known as Form A din plug.
Plugs with V5 internal circuits have bipolar LED indicators confirming supply voltage plus varistor to give overvoltage protection to the source and load.
Plugs with R5 internal circuits have full wave bridge rectifier plus LED indicator confirming supply voltage plus varistor to protect the device from supply overvoltages.