A81L-0001-0159 Fanuc Reactor 155A

Buy online your A81L-0001-0159 Fanuc Reactor 155A reference A81L-0001-0159 from our e-store Cnc-shopping, specialist in CNC machine-tools spare parts.

This FANUC line reactor from the FANUC Reactor Transformer family is designed to sit on the AC input side of FANUC power modules, servo amplifiers and spindle amplifiers. Its role is to add line impedance, limit inrush current, reduce harmonics and stabilize the supply feeding FANUC CNC drives in real shop-floor conditions. The 155 A rating suits high-load machine tools and multi-axis cabinets. A reliable replacement unit for FANUC-driven equipment in machining centers, lathes, grinders and EDM machines.

In a FANUC cabinet this reactor is typically installed between the three-phase mains and the power module. By smoothing input current and damping line disturbances it helps prevent nuisance overcurrent trips and reduces stress on semiconductors during acceleration and regenerative braking. This improves drive life and supports consistent axis performance under variable loads.

The unit is commonly paired with FANUC Alpha and Alpha i servo and spindle systems where a 155 A input choke is specified by the OEM wiring diagram. Selection is normally based on matching the exact part number and current rating to the machine’s electrical prints. Its construction and inductive characteristics are tuned for FANUC drive cabinets found across a wide range of industrial CNC installations.

Made in Japan, this reactor is suited to enclosed cabinet mounting with adequate airflow. It contributes to lower line noise, better immunity against utility fluctuations and more stable DC bus behavior in demanding duty cycles on the production floor.

A81L-0001-0159 155 A reactor for FANUC CNC cabinets.

Built by FANUC, category FANUC Reactor Transformer.

Main role: input line choke for FANUC servo and spindle power modules.

Common use: machining centers, turning, grinding and EDM equipment using FANUC Alpha or Alpha i systems where a 155 A reactor is specified.

Key details: Japan-made unit, cabinet mounted on three-phase supply, helps limit inrush, attenuate harmonics and stabilize current during regenerative events.

In maintenance contexts this model is often sourced as a spare part to replace a thermally stressed or electrically failed reactor that causes drive alarms or intermittent trips. Keeping a matched stocked replacement unit on the shelf shortens repair turnaround and helps restore machine uptime after an unexpected failure. It also supports retrofit work when rebuilding FANUC drive cabinets to original specifications.

For preventive maintenance many MRO teams keep a like-for-like reactor in industrial spare inventory to secure continuity on legacy FANUC machines. Using the correct current rating and OEM wiring ensures a straightforward drop-in fit during planned service windows and minimizes downtime risks.

Each unit can be checked on appropriate CNC test benches or simulators by skilled engineers to verify electrical behavior before dispatch. Packaging uses protective materials suitable for heavy magnetic components, with fast dispatch depending on availability and worldwide shipping options. Warranty terms are provided with the item.

This item can serve as an emergency spare for older FANUC installations and helps reduce unplanned downtime when a line choke fails. Cnc-shopping can assist with sourcing obsolete parts and may offer refurbished unit, repair service or exchange service depending on condition and availability, keeping legacy machines operational over the long term.

Frequently asked questions about A81L-0001-0159:

How do I confirm compatibility with my FANUC cabinet
Match the part number A81L-0001-0159 and the 155 A rating with the machine’s electrical diagram and the OEM parts list for your power module or spindle amplifier. If the prints call for this exact rating and code, it is the correct drop-in choice.

Where is this reactor installed in the drive system
It is typically wired on the three-phase AC input feeding the FANUC power module or amplifier inside the electrical cabinet. Mount it per the cabinet layout with proper clearances and follow the terminal markings shown in the machine documentation.

Can I use a different current rating in place of 155 A
Use the same rating and specification as listed on the machine’s wiring diagram. Substituting a different rating can affect protection and drive behavior, so stay with the OEM-specified 155 A model or consult our team for a verified alternative.

What field checks are typical before replacement
Technicians usually inspect for discoloration, loose or heat-affected terminals and insulation issues, then verify torque on connections after power is isolated. If signs of overheating or buzzing are present, replacing with a matched replacement unit is recommended.