Here's some information about it:

Series: MR-J4

Power Rating: 100W

Frame Size: B

Communication Interface: RJ020 (likely refers to an RJ45 Ethernet interface)

Manufacturer: Mitsubishi Electric

The MR-J4 series of servo motors from Mitsubishi Electric is known for its high-performance capabilities, advanced control features, and precise motion control. These motors are widely used in various industrial applications that require accurate positioning and motion control, such as robotics, CNC machines, packaging equipment, and more.

Mitsubishi Servo Motor 

MR-J4-10A  
MR-J4-10B 
HG-KR053 HG-KR13 
HG-KM053 HG-KM13   
MR-J4-20A   
MR-J4-20B  
HG-KR23  
HG-KM23  
MR-J4-40A 
MR-J4-40B 
HG-KR43  
HG-KM43  
MR-J4-60A   
MR-J4-60B 
HG-SR51（B）J 
HG-SR52（B）J 
MR-J4-70A 
MR-J4-70B 
HG-KR73（B）J 
HG-MR73（B）J 
MR-J4-100A   
MR-J4-100B 
HG-SR81（B）J 
HG-SR102（B）J 
MR-J4-200A 
MR-J4-200B 
HG-SR121（B）J 
HG-SR201（B）J 
HG-SR152（B）J 
HG-SR202（B）J 
MR-J4-350A 
MR-J4-350B 
HG-SR301（B）J 
HG-SR352（B）J 
MR-J4-500A   
MR-J4-500B 
HG-SR421（B）J 
HG-SR502（B）J 
MR-J4-700A 
MR-J4-700B 
HG-SR702（B）J