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FANUC A20B-3300-0121 is a two-axis high-speed axis control card for compatible FANUC CNC hardware. It processes servo-axis control commands within the CNC and is documented for two controlled axes, making it distinct from the four-axis A20B-3300-0120 card.
FANUC maintenance documentation lists A20B-3300-0121 in Series 15i/150i and Series 16i/18i/21i/20i-A hardware configurations. Compatibility depends on the CNC model, master PCB, card slot, servo software, system options and machine-tool builder configuration.
A20B-3300-0121 Product Information
| Brand | FANUC |
| Model / MPN | A20B-3300-0121 |
| Product Type | High-speed axis / servo control card |
| Axis Capacity | 2 axes |
| Applicable Servo Software | Series 90A0 and 90A3 |
| Documented CNC Families | Selected FANUC 15i/150i and 16i/18i/21i/20i-A configurations |
| Related 4-Axis Card | A20B-3300-0120; not interchangeable by axis count alone |
| Condition | New, refurbished, or used 90% new; subject to stock |
| Testing | 100% tested before shipping; test video available |
| Handling | Normally 1–2 business days |
| Shipping / ETA | DHL, UPS, or FedEx worldwide; typically 3–7 business days |
| Warranty | 1 year for new/refurbished; 3 months for used 90% new |
| Service / Packing | Free technical support; anti-static reinforced packing |
Two-Axis High-Speed Servo Control
The card supports CNC processing for two servo-controlled machine axes in an approved FANUC hardware configuration. Its function is different from a complete servo amplifier: the card belongs to the CNC control side, while the external servo amplifier supplies power to the motors.
A20B-3300-0121 vs. A20B-3300-0120
A20B-3300-0121 controls two axes, whereas A20B-3300-0120 controls four axes. FANUC also documents A20B-3300-0243 as a two-axis HRV3-related card, but this does not establish automatic plug-and-play interchangeability with A20B-3300-0121.
Replacement and Installation Checks
Match the complete A20B-3300-0121 number on the original card. Before replacement, confirm the CNC series, master PCB, installed axis-card position, servo software, controlled-axis count and system configuration. Back up parameters and machine data, isolate power and use anti-static handling procedures.
Related resources: FANUC PCB boards, FANUC CNC controls and FANUC CNC repair services.
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- Expedited shipping available
- Packed in secure reinforced cartons for maximum protection during transport.
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