FAIRINO FR3 vs. Rainbow Robotics RB3-730: Complete Cobot Comparison
The FAIRINO FR3 and Rainbow Robotics RB3-730 are compact six-axis collaborative robots designed for lightweight automation. Both have a nominal payload of 3 kg and a 128 mm mounting footprint, but they prioritize different advantages.
The FAIRINO FR3 is the stronger value-oriented choice. It offers better published repeatability, a lower direct purchase price, a published maximum payload of 5 kg, an optional IP65 configuration, and an 18-month manufacturer warranty.
The Rainbow Robotics RB3-730 is the stronger choice when reach, low arm weight, connectivity, environmental range, and published certification details are more important. It provides 730 mm of reach, weighs only 11 kg, operates at temperatures up to 50°C, and supports an extensive range of industrial communication protocols.
At the published prices used in this comparison, the FAIRINO FR3 costs $6,799, while the Rainbow Robotics RB3-730 is publicly listed by a European automation marketplace at €20,000 excluding VAT, approximately $22,538 using an exchange rate of €1 = $1.1269.
Main Specification Comparison
Specification | FAIRINO FR3 | Rainbow Robotics RB3-730 |
Robot type | Six-axis collaborative robot | Six-axis collaborative robot |
Published price | $6,799 | €20,000 excluding VAT |
Approximate USD equivalent | $6,799 | Approximately $22,538 |
Nominal payload | 3 kg | 3 kg |
Published maximum payload | 5 kg | 3 kg |
Reach | 622 mm | 730 mm |
Pose repeatability | ±0.02 mm | ±0.05 mm |
Degrees of freedom | 6 | 6 |
Typical TCP speed | 1 m/s | Not publicly specified as a directly comparable TCP value |
Maximum joint speed | Up to 180°/s | Up to 360°/s on J5 and J6 |
Standard protection rating | IP54 | IP54 |
Optional protection | IP65 available | Confirm available options with supplier |
Arm weight | Approximately 15 kg | 11 kg |
Mounting footprint | Ø128 mm | Ø128 mm |
Mounting orientation | Any orientation | No direction restriction |
Operating temperature | 0–45°C | 0–50°C |
Published noise level | Less than 65 dB | 60 dB(A) or less |
Tool power | 24 V / 1.5 A | 12/24 V, approximately 2 A |
Arm cable | Not separately stated on the main specification | 5 m |
Controller power | Confirm with supplied controller | 100–240 V AC, 50–60 Hz |
Approximate robot power consumption | Not published on the compared page | Approximately 100 W under a standard program |
Programming interface | 10.1-inch pendant or mobile Web App | Tablet UI, pendant and supported Windows/Linux environments |
Operating platform | FAIRINO control and Web App environment | Linux-based real-time ROS operating system |
Manufacturer warranty | 18 months | One-year free A/S has been publicly stated; confirm current contractual warranty |
U.S. presence | FAIRINO USA in San Diego, California | Rainbow Robotics U.S. office in Arlington Heights, Illinois |
Lead time | Confirm at ordering | Confirm with U.S. office or dealer |
Best overall advantage | Price, repeatability and payload headroom | Reach, low weight and connectivity |
Price Comparison
The price difference is one of the largest distinctions between these cobots.
The FAIRINO FR3 is listed by FAIRINO USA at $6,799. This is a direct published price for the robot and makes the FR3 one of the more accessible cobots in its payload category.
Rainbow Robotics does not publish one universal global MSRP for the RB3-730. A public listing from European automation marketplace Unchained Robotics shows a price of €20,000 excluding VAT. Using the referenced exchange rate, this is approximately $22,538 before VAT, international shipping, customs, integration and optional equipment.
Based solely on these visible prices:
FAIRINO FR3: $6,799
Rainbow Robotics RB3-730: approximately $22,538
Approximate difference: $15,739
The RB3-730 listing is approximately 3.3 times the FR3 price
The FR3 is approximately 70% less expensive
This is not necessarily a complete installed-system comparison. The Rainbow listing may include a different controller, pendant, service package or regional support arrangement. Buyers should request itemized quotations showing the arm, controller, safety hardware, pendant, software, shipping, training and integration.
Nevertheless, the visible difference is substantial. For organizations deploying several stations, the FR3’s lower acquisition cost can materially reduce project capital expenditure.
Payload Comparison
Both robots are categorized as 3 kg collaborative robots.
The Rainbow Robotics RB3-730 publishes a 3 kg carrying capacity. Applications must account for the complete wrist load, including the gripper, tool changer, camera, cables, fittings and handled component.
The FAIRINO FR3 publishes a 3 kg nominal payload and a 5 kg maximum payload. The higher maximum figure may provide additional flexibility, but it should not automatically be treated as equivalent to continuous 5 kg operation throughout the entire workspace.
For production planning, integrators should verify:
Payload at the required reach
Permitted center of gravity
Tool orientation
Acceleration limits
Duty cycle
Cable and hose forces
Required collaborative speed
Whether the application relies on the nominal or maximum load rating
For applications consistently below 3 kg, the robots are closely matched. When occasional additional load capacity is valuable, the FR3 has the stronger published specification.
Reach and Workspace
The RB3-730 has a clear reach advantage.
FAIRINO FR3 reach: 622 mm
Rainbow Robotics RB3-730 reach: 730 mm
Difference: 108 mm
RB3-730 reach advantage: approximately 17.4%
An additional 108 mm can be meaningful in a compact workstation. It may allow the robot to serve a wider tray, reach deeper into test equipment, cover more inspection points or operate between two adjacent process locations.
The FR3’s shorter reach can still be advantageous in very compact cells. Shorter arms can be easier to contain inside a small safety envelope and may provide better stiffness for some precision tasks.
The correct decision should be based on a reach study using the real tool geometry. A robot’s maximum reach does not mean every orientation is available at every point. Integrators should check singularities, joint limits, approach angles, cable routing and clearance around the base.
Repeatability and Precision
The FAIRINO FR3 has the better published pose repeatability.
FAIRINO FR3: ±0.02 mm
Rainbow Robotics RB3-730: ±0.05 mm
The FR3’s published repeatability error is 0.03 mm smaller. Numerically, the FR3 specification is 2.5 times tighter.
Repeatability describes the robot’s ability to return to a previously taught position under defined conditions. It is not the same as absolute accuracy. Actual process quality also depends on:
Fixture stability
Tool rigidity
Payload and center of gravity
Calibration
Temperature
Part variation
Vision accuracy
TCP definition
Robot speed and acceleration
External forces from dispensing, polishing or assembly
The FR3 is the stronger specification for repeated point-to-point placement, compact assembly, inspection positioning and applications where small positional variation matters.
Rainbow Robotics emphasizes the RB3-730’s S-pipe joint structure and contour-tracking capability. This may benefit welding, bonding and dispensing paths where smooth trajectory behavior matters more than the smallest point-repeatability number.
Robot Weight and Portability
The RB3-730 is significantly lighter.
FAIRINO FR3: approximately 15 kg
Rainbow Robotics RB3-730: 11 kg
Difference: 4 kg
RB3-730 weight advantage: approximately 26.7%
This difference matters for:
Mobile laboratory equipment
Portable demonstrations
Benchtop automation
Carts and mobile workstations
Frequently reconfigured cells
Overhead or wall installations
Structures with limited load capacity
Both robots use a compact Ø128 mm mounting footprint and support flexible installation orientations. However, mounting structures still need to resist robot-generated moments, vibration and emergency-stop forces.
The RB3-730 wins on arm portability. The FR3 remains compact but requires a more substantial supporting structure because of its higher arm weight.
Protection Rating and Operating Environment
Both manufacturers officially publish IP54 as the standard arm protection rating.
An IP54 enclosure is protected against limited dust ingress and splashing water. It is appropriate for many assembly, inspection, laboratory and general manufacturing environments but should not be assumed suitable for washdown or full exposure to coolant.
FAIRINO publishes IP65 as an optional FR3 configuration. This is a meaningful advantage for applications involving dust, mist or more demanding cleaning procedures. The buyer must confirm that the quoted robot, wrist connections and accessories are all included in the required protection level.
Rainbow Robotics’ official RB3-730 page specifies IP54. One reseller listing describes IP66, creating a discrepancy between the official manufacturer page and the marketplace specification. Until the exact ordered configuration is documented, buyers should use IP54 as the conservative specification and request written confirmation for any higher rating.
The operating-temperature ranges are:
FAIRINO FR3: 0–45°C
Rainbow Robotics RB3-730: 0–50°C
The RB3-730 therefore offers a five-degree advantage at the upper end of the published operating range.
Speed and Motion
The FAIRINO FR3 publishes a typical TCP speed of 1 m/s, with maximum joint speeds of up to 180°/s.
The Rainbow Robotics RB3-730 publishes:
J1: up to 180°/s
J2: up to 180°/s
J3: up to 180°/s
J4: up to 180°/s
J5: up to 360°/s
J6: up to 360°/s
The RB3-730’s faster wrist axes may help with tool reorientation and short-cycle manipulation. However, Rainbow does not publish a directly comparable typical TCP-speed value on the main product page.
Maximum speed is not the same as collaborative operating speed. A completed risk assessment may require lower speed, force, momentum or separation limits. Cycle-time testing should be performed using the actual payload and safety configuration.
Noise and Energy Use
The published noise specifications are:
FAIRINO FR3: less than 65 dB
Rainbow Robotics RB3-730: 60 dB(A) or less
The RB3-730 has the lower published noise ceiling, making it attractive for laboratories, educational facilities, electronics production and workstations located close to operators.
Rainbow Robotics also publishes approximate power consumption of 100 W while running a standard program. FAIRINO does not provide a directly comparable power-consumption figure on the FR3 product page.
Because robot energy use changes with payload, acceleration, duty cycle and controller configuration, buyers should request comparable test conditions before making a formal energy-cost calculation.
Controller, Programming and User Interface
FAIRINO FR3
The FR3 can be operated using a 10.1-inch teach pendant or a mobile-terminal Web App. The web-based approach can simplify access because programming and monitoring are not limited to one specialized pendant.
The FR3 is suited to buyers who prioritize straightforward deployment, direct web access and affordable ownership. Available FAIRINO documentation and integration resources should be reviewed against the intended gripper, vision system, PLC and process equipment.
Rainbow Robotics RB3-730
Rainbow Robotics uses a Linux-based real-time ROS operating system. The robot supports a tablet user interface, collision detection, gravity compensation and over-the-air software updates.
The official controller specification lists:
Four USB ports
One RJ45 LAN port
Ethernet TCP/IP
Modbus TCP
Control Script
Siemens S7
OMRON FINS
Mitsubishi MC
EtherNet/IP
PROFINET
OPC UA
This broad published protocol list is a major strength for factories with mixed automation equipment. It may reduce the amount of gateway hardware or custom communication work required during integration.
For organizations that value ROS familiarity, PLC connectivity and a transparent list of supported industrial protocols, the RB3-730 has the stronger published software and connectivity proposition.
I/O Comparison
The FAIRINO FR3 tool interface publishes:
2 digital inputs
2 digital outputs
1 analog input
1 analog output
2 high-speed pulse inputs
24 V / 1.5 A tool power
The Rainbow Robotics RB3-730 supports M8/M10 tool connections with 12/24 V and approximately 2 A. Its controller specification publishes:
16 PNP digital inputs
16 PNP digital outputs
4 analog inputs, 0–10 V
4 analog outputs, 0–10 V
Dedicated I/O expansion option
The Rainbow system has the stronger published controller-level I/O capacity and approximately 0.5 A more available tool current. The FR3 provides useful wrist-level I/O for compact end effectors, but a complex cell may require additional control hardware.
Safety and Certifications
Rainbow Robotics explicitly states that the RB3-730 has met:
TÜV SÜD requirements
CE requirements
KC requirements
ISO 10218-1
ISO/TS 15066
It also publishes collision-detection and gravity-compensation functionality.
FAIRINO markets the FR3 as a collaborative robot with human-robot collaboration features. However, the compared U.S. product page does not present the same detailed certification list beside the main FR3 specifications.
This does not mean the FR3 lacks applicable certification. It means purchasers should request the specific declarations, certificates, safety manual and firmware documentation supplied with the ordered unit.
Neither robot is automatically safe for every application merely because it is called a cobot. The final machine requires an application-level risk assessment covering:
End-effector hazards
Sharp or hot parts
Crushing and trapping points
Payload momentum
Workpiece ejection
Unexpected startup
Safety-rated stops
Power and force limiting
Speed and separation monitoring
Emergency-stop placement
Operator training
Warranty, Support and U.S. Availability
FAIRINO USA publishes an 18-month manufacturer warranty for the FR3 and lists U.S.-based after-sales support. FAIRINO USA operates from San Diego, California, and the FR3 can be purchased or quoted through its U.S. website.
Rainbow Robotics has a U.S. office in Arlington Heights, Illinois, a U.S. dealer locator and authorized integration relationships. This confirms that the RB3-730 is supported in the U.S. market, although the final supply channel depends on region and project requirements.
Rainbow Robotics previously published one year of free A/S for its RB cobot series. Because warranty terms may change by country, dealer and contract, buyers should confirm:
Warranty period
Covered parts
Labor coverage
Shipping responsibility
On-site support
Software-update entitlement
Response time
Spare-parts location
Training and commissioning
Warranty treatment for third-party accessories
Neither manufacturer provides one guaranteed public lead time for every configuration. Delivery should therefore be treated as quote-dependent.
Best Applications for the FAIRINO FR3
The FR3 is especially attractive for:
Compact pick-and-place cells
Light assembly
Screwdriving
Visual inspection
Laboratory automation
Education and research
Small-parts handling
Electronics manufacturing
Testing and measurement
Budget-sensitive multi-robot deployments
Its combination of ±0.02 mm repeatability, low price and published 5 kg maximum capacity gives it an unusually strong performance-to-cost ratio.
Best Applications for the Rainbow Robotics RB3-730
The RB3-730 is especially attractive for:
Precision assembly
Inspection
Experiment automation
Contour tracking
Light welding
Adhesive dispensing
Biotechnology automation
Electronics production
Portable laboratory equipment
PLC-intensive factories
ROS-oriented development
Cells requiring longer reach from a compact base
Its 730 mm reach and 11 kg arm weight make it a compelling option when the robot must reach farther without adding significant structural mass.
FAIRINO FR3 Advantages
Much lower published acquisition price
Better published repeatability
Published maximum payload of 5 kg
Optional IP65 protection
18-month manufacturer warranty
Direct U.S. pricing
Web App programming option
Compact Ø128 mm footprint
Any-orientation mounting
Strong choice for price-sensitive automation
FAIRINO FR3 Limitations
Shorter reach
Heavier robot arm
Lower published maximum operating temperature
Higher published noise ceiling
Less controller-level I/O shown on the main product page
Less detailed public certification presentation
Lower tool-current rating
Rainbow Robotics RB3-730 Advantages
108 mm more reach
Four kilograms lighter
Lower published noise level
Higher maximum operating temperature
Faster J5 and J6 wrist axes
Linux-based real-time ROS environment
Extensive published industrial protocol support
Large controller I/O allocation
Approximately 2 A tool power
Clear public listing of TÜV, CE, KC and ISO conformity
Rainbow Robotics RB3-730 Limitations
Significantly higher public marketplace price
Lower published repeatability
No payload headroom above 3 kg is published
Standard official protection rating is IP54
Warranty should be confirmed with the selected U.S. supplier
No directly comparable TCP-speed figure on the main product page
Final U.S. price is quotation-dependent
Final Verdict
Choose the FAIRINO FR3 when price, repeatability, payload flexibility and an optional IP65 configuration are the main priorities. At $6,799, it provides a strong specification package at a fraction of the visible RB3-730 marketplace price.
Choose the Rainbow Robotics RB3-730 when the project needs longer reach, a lighter arm, quieter operation, higher ambient-temperature tolerance or extensive PLC and industrial-network compatibility.
For most cost-sensitive pick-and-place, assembly and inspection projects, the FR3 offers the better overall value.
For laboratories, compact long-reach cells and factories where ROS, PLC communication and published certification details are central to the integration strategy, the RB3-730 may justify its higher purchase price.
Frequently Asked Questions
1. Which robot is less expensive?
The FAIRINO FR3 is listed at $6,799. The Rainbow Robotics RB3-730 is publicly listed by a European marketplace at €20,000 excluding VAT, approximately $22,538 at the referenced exchange rate.
2. Do both robots have the same payload?
Both have a nominal 3 kg payload. FAIRINO also publishes a 5 kg maximum for the FR3, while Rainbow Robotics publishes 3 kg for the RB3-730.
3. Which robot has longer reach?
The RB3-730 has 730 mm of reach, compared with 622 mm for the FR3.
4. Which robot has better repeatability?
The FR3 publishes ±0.02 mm, compared with ±0.05 mm for the RB3-730.
5. Which robot is lighter?
The RB3-730 weighs 11 kg. The FR3 weighs approximately 15 kg.
6. Are they the same size at the base?
Both publish a Ø128 mm mounting footprint.
7. Which robot has better environmental protection?
Both are officially specified at IP54 as standard. FAIRINO offers an optional IP65 FR3 configuration.
8. Which robot operates at a higher temperature?
The RB3-730 is rated up to 50°C. The FR3 is rated up to 45°C.
9. Which robot is quieter?
Rainbow Robotics publishes 60 dB(A) or less. FAIRINO publishes less than 65 dB.
10. Which robot provides more tool power?
The RB3-730 publishes approximately 2 A at 12/24 V. The FR3 provides 24 V at 1.5 A.
11. Which robot offers better industrial connectivity?
The RB3-730 has the more extensive published protocol list, including Modbus TCP, EtherNet/IP, PROFINET, OPC UA, Siemens S7, OMRON FINS and Mitsubishi MC.
12. Which robot is better for precision placement?
Based on published repeatability, the FR3 has the advantage. The entire application must still be validated with the real payload, fixture and end effector.
13. Which robot is better for contour tracking?
Rainbow Robotics specifically promotes the RB3-730’s S-pipe structure for contour tracking, welding and bonding applications.
14. Is the RB3-730 available in the United States?
Yes. Rainbow Robotics maintains a U.S. office in Illinois and provides a U.S. dealer locator. Pricing and delivery remain quote-dependent.
15. Which robot should I buy?
Select the FR3 for value, repeatability and payload headroom. Select the RB3-730 for longer reach, lower weight and more extensively documented industrial connectivity.
