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FANUC A16B-1212-0950

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Part NumberA16B-1212-0950
TypePower Supplies
Model #A16B12120950
Warranty2 Year
Input functionBuilt in
AC input connectionPower supply unit
CP1200/220/230/240 VAC input
CP2 or CP3200/220/230/240 VAC output
CP4Power on/off switch contact signal input External alarm signal input Alarm signal (FA–FB) output
CP7Supply of +5 V, +15 V, –15 V, +24 V, and +24E to the master printed–circuit board, EN signal output
CP6Reserved for future use
CP5+24V supply for the 9” monochrome CRT/MDI unit (for Series 0)

Our Repair Services

MRO Electric repairs CNCs, PLCs, Servo/Spindle Drives, Motors, Amplifiers, VFDs, HMIs, and more, most of which can be repaired in only 3-5 days.

Repair Benefits

MRO can restore your failed A16B-1212-0950 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.

Our technicians have vast experience with most manufacturers and models. In addition to this A16B-1212-0950 we also repair a wide range of other FANUC products, so if you don’t see the model you need, please contact us.

Core Exchange

If you are interested in getting credit for your faulty A16B-1212-0950, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

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Ask about exchanging your faulty A16B-1212-0950 for credit when ordering from MRO Electric

MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

FANUC A16B-1212-0950 Overview

Fanuc A16B-1212-0950

The Fanuc A16B-1212-0950 is a power supply unit manufactured by FANUC. It is a printed circuit board (PCB) power supply unit designed for use in CNC (Computer Numerical Control) systems. The power supply unit is equipped with a CE marking, indicating its compliance with European Union safety standards. These products are manufactured in Japan and are designed for Commodity production, advanced machining, and CNC milling usage. They come with a 2-year warranty from MRO Electric. We also carry Power Supplies from other manufacturers such as Siemens and Control Techniques.


The A16B-1212-0950 power supply unit is specifically designed for easy mounting and dismounting. It can be directly connected to the master printed circuit board and all its AC inputs and DC outputs are linked via connectors. This design feature simplifies the installation process.


One of the notable features of this power supply unit is its built-in input unit function. Unlike some other power supply units, there is no need for a separate relay or input unit to switch the AC input on and off. The AC input can be directly connected to the power supply unit. Additionally, the unit includes an AC service outlet that is switched on and off simultaneously with the power supply unit. This outlet can be used to provide power to other devices such as a fan motor.

The power supply unit features several signal indicators and display LEDs. The AC power supply display LED, when connected to an AC power source, lights up regardless of whether the unit is on or off. The alarm display LED, on the other hand, lights up in red if the power supply unit is switched off due to an alarm condition, such as an output error. The ENABLE signal (EN) is an output signal that indicates the normal functioning of all DC outputs. It becomes low if any output failure is detected. The power supply on/off control signal (ON-OFF-COM) is an input signal that controls the operation of the power supply unit.


The power supply unit has various input/output connectors that serve different purposes. CP1 is the connector for the 200/220/230/240 VAC input, while CP2 or CP3 is used for the 200/220/230/240 VAC output, which is switched on and off simultaneously with the power supply unit. CP4 serves as the power on/off switch contact signal input, as well as the external alarm signal input. CP7 is responsible for supplying +5V, +15V, -15V, +24V, and +24E to the master printed circuit board, and CP5 supplies +24V to the 9" monochrome CRT/MDI unit.


An external alarm signal (AL) is an input signal that turns off the power supply unit when a contact signal from another unit or external power supply becomes closed. The alarm signal (FA-FB) is a contact signal that indicates the state of all DC outputs. It is open when all DC outputs are normal and closed if any output failure is detected. These signals provide important information about the status of the power supply unit and facilitate troubleshooting.

The A16B-1212-0950 power supply unit does not require any adjustments or settings, making it convenient to use. In the case of blown fuses, the unit is equipped with specific fuses (F1, F3, F4) at different points to protect the circuitry. The causes of blown fuses are listed, along with the required corrective actions to restore normal operation. These include checking for short circuits, replacing faulty components, and ensuring proper connections.

FAQ for FANUC Power Supply Unit A16B-1212-0950

Q: What is the Part Number A16B-1212-0950?

A: The A16B-1212-0950 is a power supply unit manufactured by FANUC.

Q: What type of devices does it power?

A: This power supply unit is designed for various industrial applications, commonly used to power CNC machines and related equipment.

Q: What are its input specifications?

A: The input function is built-in, with AC input connections. CP1 accepts 200/220/230/240 VAC input.

Q: What are its output specifications?

A: CP2 or CP3 provide 200/220/230/240 VAC output. CP7 supplies +5 V, +15 V, -15 V, +24 V, and +24E to the master printed circuit board with EN signal output. CP5 supplies +24V specifically for the 9” monochrome CRT/MDI unit (for Series 0).

Q: What functions does it support?

A: CP4 offers power on/off switch contact signal input, external alarm signal input, and alarm signal (FA–FB) output.

Q: What are the applications of CP7?

A: CP7 supplies various voltages to the master printed circuit board and offers an EN signal output.

Q: Is this power supply compatible with specific machine models?

A: While designed for compatibility with FANUC systems, compatibility with specific machine models should be confirmed with the manufacturer or through detailed technical documentation.

Contact Us Today For More Information About FANUC Products

Check out the rest of our FANUC product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like A16B-1212-0950, take a look at more from our Power Supplies line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our A16B-1212-0950 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.

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