The FANUC A06B-6240-H121 is an αiSV 4-B single-axis servo amplifier module used in compatible FANUC CNC servo systems.

FANUC technical documentation classifies this model as part of the αiSV-B 200V input series. It provides power control for one servo axis and operates as part of a compatible FANUC modular servo-amplifier system.

The official specifications list a rated output current of 2.5 Arms, a nominal current limit of 4 Apeak, and a servo output frequency range of 0–550 Hz. The amplifier uses sine-wave PWM control with an IGBT bridge.

The H121 specification also supports connection to an SSM. This differentiates it from some earlier αiSV 4-B configurations and makes verification of the complete part number especially important before replacement.

The A06B-6240-H121 is commonly searched for as a FANUC servo amplifier module, AiSV 4-B servo amplifier, Alpha i-B servo drive, or single-axis CNC servo amplifier.

It is suitable for replacing an amplifier with confirmed control-circuit damage, servo alarms, failure to enable the connected axis, unstable motor operation, or other diagnosed amplifier faults.

• Single-axis servo operation tested before shipment
  
• In stock and prepared for prompt dispatch
  
• Worldwide DHL, UPS, and FedEx shipping

Product Details

• Brand: FANUC
• Part Number: A06B-6240-H121
• Alternative Format: A06B6240H121
• Official Model: αiSV 4-B
• Common SEO Name: AiSV 4-B Servo Amplifier
• Type: Servo Amplifier Module / Servo Drive
• Amplifier Series: FANUC αi-B
• Axis Configuration: 1 Axis
• Input Classification: 200V Series
• Rated Output Current: 2.5 Arms
• Nominal Current Limit: 4 Apeak
• Servo Output Frequency: 0–550 Hz
• Main Circuit Control: Sine-Wave PWM with IGBT Bridge
• 24V Control-Power Current: 0.7A
• SSM Connection: Supported
• Approximate Weight: 2.0 kg
• Product Series: A06B-6240
• Application: FANUC CNC Servo Systems
• Category: FANUC Servo Amplifier / Single-Axis Servo Drive

The model designation, axis count, current ratings, control method, control-power requirement, and SSM support above are based on FANUC technical documentation.

Referenced CNC Families

FANUC documentation lists the αiSV-B amplifier family for applicable configurations within:

• FANUC Series 30i-B
• FANUC Series 31i-B
• FANUC Series 32i-B
• FANUC Series 35i-B
• FANUC Power Motion i-Model A
• FANUC Series 0i-Model D

These are amplifier-family references and do not mean the A06B-6240-H121 is compatible with every machine using one of these controls.

Compatibility Note

Before ordering the A06B-6240-H121, please verify:

• Complete FANUC amplifier part number
• Model marking αiSV 4-B
• Single-axis amplifier requirement
• 200V-series servo configuration
• Connected servo-motor model
• SSM connection requirement
• Original connector and terminal arrangement
• CNC control model and servo configuration
• Amplifier edition and hardware revision

The A06B-6240-H101 is also identified as an αiSV 4-B amplifier, while the A06B-6240-H121 is the specification explicitly listed with SSM connection support. They should not be treated as automatically interchangeable without checking the complete system configuration.

Common Use Cases

• FANUC αiSV 4-B servo amplifier replacement
• Single-axis CNC servo-drive maintenance
• Diagnosis of servo amplifier startup failures
• Repair of an axis that cannot enable or operate normally
• Troubleshooting unstable servo-motor control
• Replacement of damaged control or power circuitry
• Preparation of a tested spare amplifier for maintenance

Sales & Support

Each A06B-6240-H121 servo amplifier is inspected and tested under applicable operating conditions before delivery.

Worldwide delivery is available through DHL, UPS, FedEx, and other express carriers. REACO CNC provides servo-amplifier repair service, warranty coverage, testing-video support, and technical assistance for FANUC CNC drive systems.