KR 120 R3900-2 K vs RX6-600
Side-by-side comparison of KR 120 R3900-2 K (KUKA Robotics) and RX6-600 (R.T.A. Robotics) — specs, pricing, Robo Score, and verified deployments. Updated daily.
Optimize comparison for buyer
Optimized for Hospitality & F&B buyers. Priority specs lifted to the top and marked with a target.
Layer 1: Identity & Trust
Manufacturer Country
- KR 120 R3900-2 KGermany
- RX6-600—
Year First Available
- KR 120 R3900-2 K2015
- RX6-600—
Verified Deployments
- KR 120 R3900-2 K0 Deployments
- RX6-6000 Deployments
Layer 2: Operational
Price
- KR 120 R3900-2 K$19,000–$84,900 USD
- RX6-600Contact for quote
Availability Status
- KR 120 R3900-2 KACTIVE
- RX6-600ACTIVE
Arm Mechanics
Payload
- KR 120 R3900-2 K146 kg
- RX6-6006 kg
Robot Weight
- KR 120 R3900-2 K42 kg
- RX6-600112 kg
Reach
- KR 120 R3900-2 K3,904 mm
- RX6-600600 mm
Degrees of Freedom
- KR 120 R3900-2 K6
- RX6-6006
Repeatability
- KR 120 R3900-2 K±0.04 mm
- RX6-600±0.05 mm
IP Rating (Arm)
- KR 120 R3900-2 KIP65
- RX6-600IP54
IP Rating (Wrist)
- KR 120 R3900-2 KIP67
- RX6-600—
Performance
Duty Cycle
- KR 120 R3900-2 K—
- RX6-600continuous 24 7
Safety
Safety Category
- KR 120 R3900-2 K—
- RX6-600Cat.3 PLd
Controller & Programming
Controller Model
- KR 120 R3900-2 KKR C5, KR C5 micro
- RX6-600—
Programming Languages
- KR 120 R3900-2 K—
- RX6-600TMscript
Teach Pendant Type
- KR 120 R3900-2 K—
- RX6-600wired touch
Offline Programming
- KR 120 R3900-2 K—
- RX6-600TMflow Editor (Offline)
Commercial
Price (USD)
- KR 120 R3900-2 K$19,000–$84,900 USD
- RX6-600Contact for quote
Warranty
- KR 120 R3900-2 K2 yrs
- RX6-6001 yrs
Service Network
- KR 120 R3900-2 Kglobal
- RX6-600global
| | |
|---|---|---|
| Layer 1: Identity & Trust | ||
| Manufacturer Country (values differ) | Germany | — |
| Year First Available (values differ) | 2015 | — |
| Verified Deployments | 0 Deployments | 0 Deployments |
| Layer 2: Operational | ||
| Price (values differ) | $19,000–$84,900 USD | Contact for quote |
| Availability Status | ACTIVE | ACTIVE |
| Layer 3: Category Specific | ||
| Arm Mechanics | ||
| Payload (priority for Hospitality & F&B buyers) (values differ) | 146 kg | 6 kg |
| Robot Weight (priority for Hospitality & F&B buyers) (values differ) | 42 kg | 112 kg |
| Reach (values differ) | 3,904 mm | 600 mm |
| Degrees of Freedom | 6 | 6 |
| Repeatability (values differ) | ±0.04 mm | ±0.05 mm |
| IP Rating (Arm) (values differ) | IP65 | IP54 |
| IP Rating (Wrist) (values differ) | IP67 | — |
| Performance | ||
| Duty Cycle (values differ) | — | continuous 24 7 |
| Safety | ||
| Safety Category (values differ) | — | Cat.3 PLd |
| Controller & Programming | ||
| Controller Model (values differ) | KR C5, KR C5 micro | — |
| Programming Languages (values differ) | — | TMscript |
| Teach Pendant Type (values differ) | — | wired touch |
| Offline Programming (values differ) | — | TMflow Editor (Offline) |
| Commercial | ||
| Price (USD) (values differ) | $19,000–$84,900 USD | Contact for quote |
| Warranty (values differ) | 2 yrs | 1 yrs |
| Service Network | global | global |
Insufficient data for full comparison
The following fields had no data for any of the selected robots: Battery / Shift Runtime, Path Accuracy, Max TCP Speed, Cycle Time (25/305/25), MTBF, Vibration Damping, Dual Check Safety, Safety I/O Pairs, E-Stop Response, Safe Zone Count, Digital Twin Support, Communication Protocols, ROS-Industrial Support, IoT / Cloud Platform, Cybersecurity Certs, Predictive Maintenance, Tool Flange Standard, Tool Changer (ISO), Internal Cable Routing, Pneumatic Lines, Electrical Lines, Spare Parts Lead Time, Expected Service Life
ROI Comparison
Same operating assumptions across every robot — the only difference is price. Set your numbers once to see which pays back fastest.
Annual labor displaced (per robot): $50,000
| Metric | KR 120 R3900-2 K | RX6-600 |
|---|---|---|
| Investment | $51,950 | No price |
| Payback period | 12.5 mo | — |
| Net savings (5 yr) | $198,050 | — |
| ROI (5 yr) | +381% | — |
RX6-600 has no listed price, so payback can't be computed. Contact the manufacturer for a quote.
Estimates labor-cost displacement only — not a full total cost of ownership. Actual ROI depends on integration, maintenance, training, downtime, and task fit. Converted currencies are indicative; USD is the price of record.
Trade-offs at a glance
Frequently asked
Who makes KR 120 R3900-2 K and RX6-600?
KR 120 R3900-2 K is made by KUKA Robotics, based in DE. RX6-600 is made by R.T.A. Robotics.
How do KR 120 R3900-2 K and RX6-600 compare on the Robo Score?
KR 120 R3900-2 K scores 78.0 on the Robo Score. RX6-600 scores 56.8. The Robo Score is a 0–100 credibility figure blending commercial maturity, verified deployments, company standing, and independent coverage — see methodology for the full breakdown.
How does the reach of KR 120 R3900-2 K compare to RX6-600?
KR 120 R3900-2 K has a reach of 3904 mm. RX6-600 has a reach of 600 mm.
Are KR 120 R3900-2 K and RX6-600 in the same category?
Both robots are classified as Industrial Arm on Robolist. Filters and ranking treat them as direct alternatives.
What is the realistic total cost of ownership for Industrial Arm robots?
Hardware cost is one input. Industrial Arm TCO also includes integration, training, downtime, and end-of-life. Our breakdown: TCO of a 6-Axis Arm Cell: Hardware, EOAT, Integration, Programming.
What should a buyer ask vendors when choosing between KR 120 R3900-2 K and RX6-600?
Spec sheets only show part of the story. Useful vendor questions cover support, lifecycle, integration cost, and references. We have a buyer-focused checklist: Industrial Arm Vendor Selection: Capability Matrices and Proof Points.
Going deeper — picking the right robot
TCO of a 6-Axis Arm Cell: Hardware, EOAT, Integration, Programming
7 min readIndustrial Arms
Industrial Arm Vendor Selection: Capability Matrices and Proof Points
9 min readIndustrial Arms
Programming Approaches: Teach Pendant, Offline, AI-Assisted — What Each Costs You
8 min readIndustrial Arms
Build vs buy vs lease: which model fits a first deployment
8 min readChoosing Your First Robot
The hidden specs vendors hope you'll miss
10 min readReading the Spec Sheet
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About this comparison
KR 120 R3900-2 K vs RX6-600 compares two robots in the industrial-arm category. All data is sourced from manufacturer spec sheets, verified deployments, and third-party filings; see our methodology for how the Robo Score is calculated.