What is C19 and C20?

As data centers deploy more powerful blade servers, AI accelerators, and enterprise switches, standard C13 connectors can no longer handle the increased power demands. C19 and C20 are high-capacity power connectors designed specifically for these high-load applications.

They deliver stable, reliable electricity to equipment that requires up to 20A of current, preventing overloads and overheating. YOSUN offers a full line of PDUs with C19 and C20 connectors, engineered to meet the strict power requirements of modern data centers and industrial facilities.

Key Takeaways

• C19 and C20 are IEC 60320 international standard connectors for high-power devices up to 20A/250V
• C19 is the female receptacle; C20 is the matching male plug
• Their unique square shape prevents accidental use with lower-capacity C13/C14 connectors
• They power blade servers, enterprise switches, UPS systems, and industrial machinery
• YOSUN provides customizable C19/C20 PDUs with global safety certifications
• Locking connectors prevent accidental disconnections in critical environments

What Are C19 and C20 Connectors?

C19 and C20 are part of the IEC 60320 standard, which defines the most common types of power connectors used worldwide. This standard ensures compatibility between devices and power sources from different manufacturers.

C19 Connector (Female Receptacle)

The C19 is a square-shaped female connector, larger and more robust than the standard C13 connector. It is rated for 16A/250V globally and up to 20A/125-250V in North America. Its design allows it to carry high currents while remaining cool, even under continuous load.

C19 connectors are typically found on:

• PDU outlets
• UPS input/output ports
• High-power server power supplies

C20 Connector (Male Plug)

The C20 is the matching male plug for the C19 receptacle. It has a rectangular shape that fits tightly into the C19 socket, creating a secure electrical connection. Like the C19, it is rated for 16-20A/250V and meets the same strict IEC safety standards.

C20 connectors are typically found on:

• Power cords that connect devices to PDUs
• High-power equipment power inputs
• Industrial machinery power cables

Critical Electrical Safety Warning: Never exceed the 16A/250V rating of C19/C20 connectors. Overloading can cause overheating, melting, and electrical fires. Always use cables rated for the full current of your device.

C19 and C20 Comparison and Applications

C19 and C20 Technical Specifications

To choose the right power connection for high-density IT equipment, it’s important to understand the core specifications of C19 and C20 connectors. These connectors are designed to handle higher current loads than standard options, making them ideal for servers, UPS systems, and data center applications. The table below outlines their key technical characteristics, so you can quickly compare their performance and compatibility:

C19 vs C20: What’s the Difference?

The primary difference between C19 and C20 is their gender and function:

Both connectors have identical electrical ratings and are designed to work together as a matched pair. Their square shape ensures they cannot be accidentally connected to lower-capacity C13/C14 connectors, preventing dangerous overloads.

C19/C20 vs C13/C14: When to Use Which?

This is the most common question when selecting power connectors. The table below compares the two most common IEC connector pairs:

Use C13/C14 for devices that draw less than 10A. Use C19/C20 for any device that requires more than 10A of current.

Common Applications

C19 and C20 connectors are used in a wide range of high-power applications:

• Data Centers: Blade servers, enterprise switches, storage arrays, UPS systems
• Industrial: Factory machinery, automation equipment, power distribution units
• Medical: High-power medical devices, imaging equipment
• Telecommunications: Network routers, telecom racks, power supplies

YOSUN offers specialized PDUs for each of these applications, including 3-phase 125A PDUs with 24 C19 outlets for high-density data centers and remote-managed PDUs for network closets.

How to Choose the Right C19/C20 Solution

Assess Your Power Requirements

Start by calculating the total power draw of your equipment. If any device requires more than 10A, you will need C19/C20 connectors. Always leave 20-30% extra capacity for future growth.

Consider Safety and Reliability

• Choose connectors and PDUs with global safety certifications (UL, VDE, TUV, SAA, KC, PSE)
• Use locking connectors or cable retention clips to prevent accidental disconnections
• Ensure all components are rated for the full current of your system

Customization Options

YOSUN offers fully customizable C19/C20 PDUs:

• Mixed outlet configurations (C13 and C19 in the same unit)
• Modular designs for easy upgrades
• Custom cable lengths and plug types
• Integrated monitoring and remote management features

Our modular approach allows you to build a power distribution system that exactly matches your needs, eliminating wasted space and unnecessary costs.

Conclusion

C19 and C20 connectors are the industry standard for high-power electrical connections in data centers, industrial facilities, and medical environments. Their robust design and high current capacity make them essential for powering modern IT equipment.

When selecting C19/C20 solutions, prioritize safety, reliability, and flexibility. YOSUN has over 20 years of experience in power distribution, offering a complete line of certified PDUs with C19/C20 connectors. Whether you need a basic power strip or an intelligent switched PDU, we have the right solution for your facility.

FAQ

What devices use C19 and C20 connectors?

C19 and C20 connectors are used for high-power devices including blade servers, enterprise switches, storage arrays, UPS systems, industrial machinery, and medical equipment.

Can you use a C20 plug with a C19 inlet?

Yes. The C20 male plug fits perfectly into the C19 female inlet. This is the standard connection for high-power devices in data centers and industrial environments.

Why do C19 and C20 connectors have a square shape?

The square shape prevents accidental use with lower-capacity C13/C14 connectors, which could lead to dangerous overloads and overheating.

How do you keep C19 and C20 cords from coming loose?

Use cable retention clips or locking C19/C20 connectors. These devices hold the cord securely in place, preventing accidental disconnections that could cause downtime.

Can I mix C13 and C19 outlets in the same PDU?

Yes. YOSUN offers PDUs with mixed outlet configurations, allowing you to power both low-power and high-power devices from a single unit. This simplifies installation and reduces costs.