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Monoprice 135059 Heavy Duty Extension Cord C20 to C19 20A 6ft — main product image
Monoprice 135059 Heavy Duty Extension Cord C20 to C19 20A 6ft
Monoprice 135059 Heavy Duty Extension Cord C20 to C19 20A 6ft
Monoprice 135059 Heavy Duty Extension Cord C20 to C19 20A 6ft
Monoprice 135059 Heavy Duty Extension Cord C20 to C19 20A 6ft
Monoprice 135059 Heavy Duty Extension Cord C20 to C19 20A 6ft
Monoprice 135059 Heavy Duty Extension Cord C20 to C19 20A 6ft
Monoprice

Monoprice 135059 Heavy Duty Extension Cord C20 to C19 20A 6ft

★★★★★5.0 (3 reviews)

Deliver reliable 20A power to servers and network gear with this heavy-duty 12AWG C20-to-C19 extension cord.

$17.23*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Monoprice 135059 is a heavy-duty power extension cord designed specifically for high-current server and networking applications. It connects an IEC 60320 C20 inlet — commonly found on UPS systems, power distribution units, and high-capacity power strips — to an IEC 60320 C19 device inlet used by servers, blade server enclosures, routers, and enterprise-grade network switches. The 12 AWG wire gauge is a key specification: the heavier conductors minimize resistance across the 6-foot run, reducing voltage drop and heat generation under sustained 20-amp loads.

Rated at 20 amps and 250 volts for a maximum capacity of 5,000 watts, this cord is built for environments where power reliability is non-negotiable. It can serve as an extension between a device and its power source, or as a replacement for a manufacturer-supplied cord that may be too short or of insufficient gauge for the deployment. The rugged construction is designed to withstand the repeated plugging and routing typical of rack-mount environments. Monoprice backs the cord with a lifetime warranty, and their technical support team is available for questions about compatibility and specifications.

Key Features

This Monoprice heavy-duty extension cord features 12 AWG conductors suitable for high power connections, making it a reliable solution for large server applications that require a higher-rated, heavier-gauge Cable.

This cord can be used to connect a server, router, network switch, or blade server enclosure to an Uninterruptible power supply system or power distribution unit, or to replace or upgrade the standard power cord provided by the device's Manufacturer.

Buy with confidence: with Monoprice Lifetime Warranty on all cables, you can rest assured we stand behind our products and our customers

Quality at a fair price: Monoprice rugged design and rigid quality control standards deliver high quality products at fair prices.

Service & Support: you're never on your own with Monoprice products! We have a full team of friendly and knowledgeable technicians available to answer your questions

Specifications

Connector (Input)
IEC 60320 C20
Connector (Output)
IEC 60320 C19
Amperage
20A
Voltage
250V
Wattage
5,000W
Wire Gauge
12 AWG
Length
6 feet
Color
Black
Warranty
Monoprice Lifetime Warranty

Pros & Cons

👍 Pros

  • 12 AWG heavy-gauge conductors support sustained 20A high-power connections with minimal voltage drop
  • C20-to-C19 connector pair is the industry standard for server, UPS, and PDU equipment
  • 6-foot length provides useful reach without excessive cable slack in rack environments
  • Backed by Monoprice lifetime warranty on all cables

👎 Cons

  • 6-foot length may be too short for routing between widely spaced racks or across a room
  • 250V rating means it is not compatible with standard 120V household outlets — requires appropriate C20 power source
  • Black color matches most rack environments but may be harder to trace visually among other black cables

Frequently Asked Questions

It features an IEC 60320 C20 plug on one end and an IEC 60320 C19 connector on the other, which is the standard high-power connector pair used in server and data center equipment.
The cord is rated for 20 amps at 250 volts, supporting up to 5,000 watts of power delivery.
It is 6 feet (approximately 1.8 meters) in length.
It uses 12 AWG conductors, which is a heavier gauge that reduces resistance and voltage drop, making it suitable for sustained high-current loads in server and networking environments.
Yes, Monoprice provides a lifetime warranty on all their cables, including this extension cord.

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