They are similar to the C1/C2 variation except the "key" prevents this connector from being plugged in either polarity, effectively "polarizing" the device.

RS PRO IEC C7 Socket to Type C Europlug Plug Power Cord, 1.8m

It stands alongside two other 7th chords (C7 and D7) as well as a C and F chord to create the definitive version of this classic that’s been covered by too many artists to count. High Powered Blade Server Chassis such as the HPE c7000 utilize multiple C20 inlets for power due to the high power consumption of the each blade server within. For example, an electric kettle cord can be used to power a computer, but an unmodified computer cord cannot be used to power a kettle. North American rating agencies ( CSA, NOM-ANCE, and UL) will certify IEC 60320 connectors for higher currents than are specified in the IEC standard itself. These are similar in form to the C13/C14 coupler, except with a ridge opposite the earth in the C16 inlet (preventing a C13 fitting), and a corresponding valley in the C15 connector (which doesn't prevent it fitting a C14 inlet).This power cord has PVC single insulation and shielding and annealed soft bare copper wire conductor.

C7 Power Supply Cord - Cablesgo US IEC C7 Power Supply Cord - Cablesgo

The C6 inlet is used on laptop power supplies and portable projectors, as well as on some desktop computers, some LCD monitors and recent LCD televisions from LG. This version only uses four of the six strings, making it sound higher and thinner than the open version.

The appliance inlet is designated by the even number one greater than the number assigned to the connector, so a C1 connector mates with a C2 inlet, and a C15A mates with a C16A. a Protection Class II connector cannot mate with a Class I inlet which requires an earth); whereas connecting a Class I connector to a Class II appliance inlet is possible because it creates no safety hazard.

Power Cords | Extension Plug | RS Power Cords | Extension Plug | RS

This kind of coupler is used by Roland Corporation for a couple of synthesizer and drum-computer models (for example: TR-909, D-50) and by Revox for many older models of their hi-fi equipment (for example, A76, A77, A78, B77, B225). The IEC 60320 C12 Inlet is a polarized version of the C10, and is rated up to 250V and 10 Amps Internationally or 250/125V and 15 Amps in North America. One arbitrarily chosen example of a 1500W PSU with a C14 input is the Enermax MAXREVO 1500 W 80+ Gold. Each Plug, Connector, Inlet is unique and can only be mated with a component with comparable voltage and amperage ratings. Power cable assemblies are defined as any power cable which has had a connector installed prior to sale.The C16 is identical to the C14 except for the nob below the ground pin which is the biggest distinguisher for this variation. There is some public confusion between C13/C14 and C15/C16 couplers, and it is not uncommon for C13/C14 to be informally referred to as "kettle plug" or "kettle lead" (or some local equivalent).