UR3e vs RealMan RM75-B: Cobot Comparison of Axes, Weight and Price
Updated: 9 hours ago
IN A NUTSHELL
🔎 THE KEY DIFFERENCE RealMan RM75-B has the higher stated load capacity and longer stated reach. Those figures help shortlist it for heavier loads or wider layouts, but do not prove a faster production cycle. Universal Robots UR3e has 6 axes, compared with 7 axes for RealMan RM75-B. |
→ CONSIDER Universal Robots UR3e Consider it when its stated load and reach already cover your task and its controls fit your equipment. This article compares 3 kg with a published reach of 500 mm; include the gripper and part in the load. |
→ CONSIDER RealMan RM75-B Consider it when additional load capacity and reach matter. This article compares 5 kg with a published reach of 610 mm; include the gripper and part in the load. |
💡 THE TAKEAWAY Check the required tool angles and approach path: different axis counts change movement options. Choose only after both suppliers demonstrate the loaded task and quote the same complete installation. |
The Universal Robots UR3e and the RealMan RM75-B are light arms for different users. The RM75-B adds a seventh axis, carries 2 kg more, weighs 7.8 kg with its controller in the base and costs about 30% less. The UR3e is more precise, faster and fully industrial.
Quick verdict. The RealMan RM75-B is the better choice for mobile, humanoid and research platforms that need redundant motion, with 7 axes, 5 kg payload and a listed price about 30% lower. The UR3e is the better choice for production work, with ±0.03 mm repeatability, a 3 m/s tool speed and a built-in force/torque sensor.
UR3e and RealMan RM75-B at a glance
The UR3e carries 3 kg over 500 mm, repeats to ±0.03 mm and weighs 11.2 kg.
The RealMan RM75-B carries 5 kg over 610 mm with 7 axes, repeats to ±0.05 mm and weighs 7.8 kg with the controller inside its base.
Main specification comparison
Specification | Universal Robots UR3e | RealMan RM75-B |
Brand | Universal Robots | RealMan |
Listed price | $33,800 | $23,550 |
Payload | 3 kg | 5 kg |
Reach | 500 mm | 610 mm |
Repeatability | ±0.03 mm | ±0.05 mm |
Axes | 6 | 7 |
Speed | 3 m/s maximum TCP speed | TCP up to 1.8 m/s; joints 1-2: 180°/s; joints 3-7: 225°/s |
Arm weight | 11.2 kg | 7.8 kg |
IP rating | IP54 | Not specified |
Controller | UR control box CB 5.5 / CB 5.6 | Integrated in the robot base |
Price comparison
UR3e: listed from $33,800
RealMan RM75-B: listed from $23,550
Difference: $10,250
The RM75-B costs roughly 30% less
Axes and payload
The RM75-B's seventh, redundant axis lets it reach around obstacles while keeping the tool orientation. It carries 5 kg against 3 kg and reaches 610 mm against 500 mm, which suits manipulation tasks on mobile and humanoid robots.
Weight and power
The RM75-B weighs 7.8 kg, runs from 24 V DC at a typical 200 W and houses its controller in a 107 mm base. The UR3e weighs 11.2 kg and uses a separate control box.
Precision and industrial features
The UR3e publishes ±0.03 mm repeatability and a 3 m/s maximum tool speed, against ±0.05 mm and 1.8 m/s for the RM75-B. It has a built-in ±30 N / ±10 Nm force/torque sensor, IP54 and PROFINET with PROFIsafe, EtherNet/IP, Modbus TCP and ROS/ROS2.
Best applications for the UR3e
Production benchtop assembly
Force-controlled insertion
Robots inside machines
Best applications for the RealMan RM75-B
Humanoid and mobile manipulation
Research needing redundant motion
Battery-powered platforms
UR3e advantages
±0.03 mm repeatability
3 m/s maximum tool speed
Built-in force/torque sensor
UR3e limitations
About $10,250 higher listed price
6 axes
RealMan RM75-B advantages
7 axes and 5 kg payload
7.8 kg arm with integrated controller
About 30% lower listed price
RealMan RM75-B limitations
±0.05 mm repeatability
Final verdict
Choose the RealMan RM75-B for redundant motion on mobile and humanoid platforms. Choose the UR3e for precise production work.
Sources and further reading
Frequently asked questions
Which is cheaper, the UR3e or the RealMan RM75-B?
The RM75-B is listed from $23,550 and the UR3e from $33,800, a difference of $10,250.
How many axes do they have?
The RM75-B has 7 axes and the UR3e 6.
Which robot carries more?
The RM75-B carries 5 kg and the UR3e 3 kg.
Which robot is more precise?
The UR3e publishes ±0.03 mm repeatability and the RM75-B ±0.05 mm.
Which robot is lighter?
The RM75-B weighs 7.8 kg and the UR3e 11.2 kg.
Which robot should I buy?
Choose the RM75-B for mobile platforms. Choose the UR3e for production.
