FANUC A20B-1005-0421 PCB

  • Power Supply PCB (type C / type B)
  • 24 VDC input (FS-18TC, 21MB, 21TB)
  • Exchange in stock. $595.00 USD
  • 24 hour repair turnaround

12 month warranty, same day ship

SKU: A20B-1005-0421 Category:



The A20B-1005-0421 Fanuc power supply pcb is fitted on a number of controls. It is known as a type C power supply for the 16-C, 18-C (though normally single or dual slot backplane 18-TC, 18-MC); and as the type B as the small capacity PSU or power board for the 21-B control.

This GE Fanuc series power supply PCB piggy backs onto the I/O PSU board on the 21B/18B controls. Its a 24VDC input, not requiring the relay (input) stage of its predecessors; due to the lower power consumption of the control systems it powers.

Benefits of ordering A20B-1005-0421 from CNC West ?

CNC West offer extensive services for Fanuc power supply units. This C or B type power supply pcb (18C or 21B type respectively) is tested prior to be supplied on an exchange basis prior to being shipped to customers.

The Fanuc A20B-1005-0421 is part of a system designed to make it easy to interface automation into your manufacturing facilities. Furthermore, this device is lightweight at less than 1lb. The product carries with a one-year warranty so if you have any problems, you’ll be able to get it repaired or replaced if problems occur within a year of purchase.

Our shipping, repair, testing policies: A20B-1005-0421

If you ever need to get this product repaired, we’ll endeavor to fix it within 24 hours or less. This is not considered a rush or urgent service. Our repair services are also covered by the product’s one-year warranty. If you order this product from us before 3.00PM and its in stock; then we should be able to ship same day. Similar to our ability to repair, we also offer testing of this C or B type PSU. Check our Fanuc alarm pages for known issues.


The Fanuc A20B-1005-0421 is fitted extensively within CNC manufacturers machines with its sibling PSU 0420 being less more popular. Normally found on the following series as C type for 18-TC, FS-18-GC, and B type for 21-TB, 21-MB control systems. This type of control system is commonly used in manufacturing facilities that use CNC machine tools and or robotics.

Interested in learning more? Contact us if you wish to discuss options for surplus, exchange or repair of your A20B-1005-0421 at (619) 477-9011 or by email at sales@cnc-electronics.net. We’d be happy to answer your questions and give you a free copy of our 2020 catalog!

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