The FANUC A81L-0001-0157 is a three-phase AC reactor specified for compatible FANUC PSM-26i and αi PS 26 power supply configurations.

FANUC’s αi-Series amplifier documentation lists this exact part number as the standard AC reactor for the PSM-26i / αi PS 26 power supply module. It is installed as part of the main AC input circuit for the regenerative power supply system.

FANUC’s later αi-B documentation also lists the A81L-0001-0157 as the earlier IP1X reactor specification for the αiPS 26-B, while A81L-0001-0186 is identified as the current IP2X version.

This product is commonly searched for under names including:

• FANUC A81L-0001-0157 AC Reactor
• FANUC PSM-26i Line Reactor
• FANUC αi PS 26 Reactor
• FANUC αiPS 26-B Input Reactor
• FANUC Three-Phase CNC Reactor

These names are consistent with FANUC documentation and established industrial-parts terminology. The product should not be classified as a servo amplifier, power supply module, PCB, or general-purpose transformer.

The reactor is suitable for replacement when the original A81L-0001-0157 has confirmed winding damage, overheated terminals, damaged insulation, abnormal physical condition, or another verified electrical fault.

• Inspected and electrically checked before shipment
  
• Exact part number and label verified before dispatch
  
• Worldwide DHL, UPS, and FedEx shipping

Product Details

• Brand: FANUC
• Part Number: A81L-0001-0157
• Alternative Format: A81L00010157
• Official Product Type: AC Reactor
• Common Product Name: AC Line Reactor
• Applicable Power Supply: FANUC PSM-26i / αi PS 26
• αi-B Reference: Earlier Reactor for αiPS 26-B
• Input-System Class: 200V Series
• Main-Circuit Type: Three-Phase AC
• Associated Power-Supply Capacity: 26kW
• Reference Heat Dissipation: 70W
• Official Reference Weight: Approximately 9.5kg
• Protection Version: Earlier IP1X Specification
• Later Documented Version: A81L-0001-0186, IP2X
• Product Series: A81L-0001
• Application: Compatible FANUC Regenerative Power Supply Systems
• Category: FANUC AC Reactor / CNC Power-System Component

The 26kW value refers to the applicable PSM-26i power-supply capacity, rather than independent mechanical output produced by the reactor.

Electrical Rating Clarification

A single fixed current and inductance value should not be published for every A81L-0001-0157 without first checking the physical product label.

Public certification records list at least two approved constructions under the same FANUC ordering number:

• TAM construction: 110A, AC264V, 0.07mH
• TOK construction: 125A, AC264V, 0.055mH

Some industrial replacement pages list the unit as 110A, 240V, three phase, 0.07mH, which appears to correspond to one specific construction rather than every possible A81L-0001-0157 unit.

For this reason, the safest Shopify product page should use the verified general specification above. The exact current, voltage marking, inductance and manufacturer construction can be added after confirming the label on the unit being sold.

Physical Configuration Note

FANUC documentation shows two physical shapes under the same A81L-0001-0157 specification drawing. FANUC states that the customer cannot specify which construction is supplied.

The documented maximum envelopes are approximately:

• Shape 1: 128 × 155 × 165mm
• Shape 2: 70 × 155 × 165mm

Both versions retain the same key installation and terminal-layout dimensions shown in the FANUC drawing.

Because the exterior shape may vary, product photographs and terminal measurements should be checked before replacing a unit solely by appearance.

A81L-0001-0157 and A81L-0001-0186

FANUC distinguishes the two reactor specifications as follows:

• A81L-0001-0157: Earlier version supporting IP1X conductive-part protection
• A81L-0001-0186: Current version supporting IP2X conductive-part protection

Both are documented in connection with the αiPS 26-B power-supply capacity, but the later version has updated protection around conductive parts.

They should not be advertised as completely identical without checking:

• Mounting arrangement
• Terminal construction
• Cabinet clearances
• Cable terminals
• Original electrical drawing
• Applicable FANUC manual revision
• Safety and protection requirements

Compatibility Note

Before ordering the A81L-0001-0157, please verify:

• Complete FANUC part number
• Original reactor identification label
• PSM-26i, αi PS 26 or applicable αiPS 26-B configuration
• Earlier IP1X reactor requirement
• Three-phase 200V-series input system
• Current and inductance shown on the actual label
• Terminal-bolt size and terminal arrangement
• Mounting-hole positions
• Available cabinet space
• Condition of the connected cables and crimp terminals
• Whether A81L-0001-0157 or A81L-0001-0186 is required

FANUC assigns different AC reactor numbers to different power-supply capacities. A similar-looking A81L reactor intended for PSM-15i, PSM-30i or PSM-37i should not be selected as a substitute based only on appearance.

Common Use Cases

• Replacement of a FANUC A81L-0001-0157 AC reactor
• Maintenance of a PSM-26i power-supply system
• Restoration of an αi PS 26 input-power circuit
• Maintenance of an earlier αiPS 26-B IP1X configuration
• Replacement of a reactor with damaged windings or insulation
• Replacement of overheated or physically damaged terminals
• Preparation of a matching spare reactor for maintenance inventory

Sales & Support

Each A81L-0001-0157 AC Reactor is checked for part-number accuracy, label specifications, winding condition, insulation condition, terminal integrity and physical damage before delivery.

The actual current, inductance, manufacturer construction and exterior shape can be confirmed from the supplied unit before shipment.

REACO CNC provides warranty coverage, product-identification assistance and technical support for FANUC reactors, power supply modules, servo amplifiers and spindle amplifiers.

Worldwide delivery is available through DHL, UPS, FedEx and other express carriers.