The Universal Robots UR3e is the smallest of the UR e-Series robots. The e-Series have multiple improvements compared to the CB3 series (UR3/UR5/UR10).
The main improvements are:
- Built-in 6-axis force/torque sensor (to improve force/torque applications)
 - Repeatability improved from ± 0.1 mm to ± 0.03 mm on UR3e/UR5e and ± 0.05 mm on UR10e
 - Completely redesigned teach pendant with higher resolution screen and improved user interface
 - Added safety features
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Improved tool connector supports new end-effectors
 - Much thinner and more manageable teach pendant cable
 - Redesigned and lighter controller
 - Improved mechanical features on robot arm (mainly base, couplings and joints)
 - Addition of four separate high speed quadrature digital inputs
 

Datasheet (UR3e_ENG.pdf)
			
