How Much Do You Know About IEC Connectors in Power Cords？

In data centers, offices, and industrial environments, power cord connectors come in many forms, but they are not arbitrarily designed. They all follow the IEC 60320 international standard. For IT purchasers and electrical engineers alike, understanding the differences between these connectors is essential to ensuring equipment safety and system stability.

What are the IEC 60320 Standards?

IEC 60320 is an international standard issued by the International Electrotechnical Commission (IEC) that defines appliance couplers for detachable power cords used to connect electrical equipment to mains power. It is a foundational standard for power cord compatibility and safety in IT infrastructure, data centers, and commercial equipment worldwide.

The IEC 60320 standard clearly specifies connector types and standardized dimensions to ensure global interoperability, electrical ratings such as current, voltage, and temperature limits, safety requirements including insulation, grounding, and contact design, as well as interchangeability rules that ensure plugs and inlets mate correctly and safely. The scope of IEC 60320 is limited to detachable power cords and does not apply to permanently wired connections.

IEC 60320 connectors are identified by the letter "C" followed by a number, which indicates both form factor and mating relationship.

Odd-numbered types (such as C7, C13, and C19) represent female connectors installed on power cords to supply power, while even-numbered types (such as C8, C14, and C20) represent appliance inlets mounted on equipment to receive power.

This numbering logic helps prevent mismatched connections and supports safe, standardized power delivery.

Conmmon IEC 60320 Connector Types

IEC C13/C14 Connector

The IEC C13 connector is one of the most widely used power connectors in IT and office environments. It features a three-pin design with grounding and is suitable for devices with moderate power requirements.

IEC C13 connectors are commonly used to power:

Servers and network switches

Desktop computers and monitors

Office IT equipment

The IEC C14 connector is the corresponding inlet and is typically found on:

Power distribution units (PDUs)

Server power supplies

Networking equipment

FS provides a range of IEC 60320 C14 to C13 connectors designed for reliable use in rack and IT environments.

IEC C15/C16 Connector

The IEC C15 connector is visually similar to the IEC C13 connector but features a keyed notch at the bottom, which distinguishes it from standard C13 designs.

This structural difference enables specific compatibility rules:

IEC C15 connectors can be plugged into standard C14 inlets

IEC C13 connectors cannot be inserted into IEC C16 inlets

, preventing the use of cables that are not rated for high-temperature environments

IEC C15 connectors are designed for applications exposed to elevated operating temperatures and are commonly used in:

Electric kettles and heat-generating appliances

Stage lighting and professional AV equipment

High-density server racks where thermal conditions are more demanding

The IEC C16 connector is the corresponding inlet and is typically found on:

Equipment requiring enhanced heat resistance

Devices operating near heat sources or under continuous load

Thermal rating:

Up to 120°C for IEC C15/C16 connectors

By comparison, standard IEC C13/C14 connectors are typically rated for

70°C

Selection note: IEC C15/C16 connectors should be used whenever operating temperature, rather than current alone, is the limiting factor in power cord selection.

EC C19/C20 ConnectorIEC C19 and C20 Connectors

IEC C19 and C20 connectors are Common for supply of power to enterprise-class servers, UPSs, datacenter rack-mounted power-distribution units and other equipment that draws too much current for C13/C14 type to be used.

The IEC C19 connector supports higher current ratings than C13 and is typically deployed in:

Data centers

High-density racks

Industrial-grade IT equipment

It is often paired with C20 inlets, which are commonly integrated into:

Rack-mounted PDUs

High-capacity power sources

This connector pair provides a more robust power connection for devices with higher power consumption. FS supplies IEC60320 C20 to C19 power cords designed for demanding power environments.The IEC C20 connector is the counterpart to the C19 connector. It features three pins and is commonly found on rack-mounted PDUs and power sources. The C20 connector provides a reliable power connection to devices with high power requirements. The image below provides you with a detailed view of the FS IEC60320 C20 to C19 connector.

Application Scenarios of IEC Power Cords

IEC power cords provide a stable power supply for a wide range of scenarios, including data centers, server rooms, homes, offices, and many others. They are designed to deliver reliable and uninterrupted power to critical equipment, ensuring smooth operations and minimizing the risk of power-related disruptions. Whether it's powering high-performance servers in a data center or providing electricity to essential devices in a home or office setting, IEC power cords offer a dependable solution for maintaining a stable power supply.

Different connectors like C13/C14, C15/C16, C19/C20 meet various power needs and device types, serving different situations effectively. Their standard design and different connector types make them work with many types of equipment, fitting easily into different settings. In summary, IEC power cords are essential tools for efficient power transmission, providing secure and efficient power connections for a wide range of devices.

IEC Power Cord Connectors FAQ

Q: Can IEC power cords be used worldwide?

A: Yes. IEC 60320 connectors are internationally standardized and can be used across regions when paired with the appropriate local plug.

Q: How do I choose the right IEC power cord for a PDU?

A: Check the PDU outlet type (C14 or C20), the connected device’s power requirements, and ensure the power cord’s current rating matches the load.

Q: Are C13 and C15 interchangeable?

A: A C15 power cord can be plugged into a C14 outlet, but a C13 power cord cannot be plugged into a C16 outlet. For heat-generating equipment, it is recommended to always use a C15 power cord.

Q: What is the difference between IEC C13 and C19 connectors?

A: C19 connectors support higher current ratings and are designed for high-power devices, while C13 connectors are suitable for standard IT equipment.

Q: Why does the C19 connector look much larger than the C13?

A: The larger size provides physical isolation. Since C19 connectors carry higher current, the bigger design helps prevent lower-rated C13 power cords from being mistakenly connected to high-power equipment.

Conclusion

In general, IEC power cords are widely utilized and reliable solutions for power connections. They possess advantages such as standardization, safety, flexibility, and replaceability. FS IEC power cords have passed a 100% electrical test and feature excellent electrical conductivity and flame retardant grade, ensuring safe maximum current transmission. Whether in homes, offices, or various industrial and professional environments, IEC power cords are vital components that ensure the proper operation of equipment.