B90 Bus Differential Relay - UR Series Instruction Manual - B90 Revision: 3.0x
B90 Bus Differential Relay - UR Series Instruction Manual - B90 Revision: 3.0x - C2
B90 Bus Differential Relay - B90 Revision: 4.0x
B90 Bus Differential Relay - UR Series Instruction Manual - B90 Revision: 4.9x - M1
B90 Low Impedance Bus Differential System - UR Series Instruction Manual - B90 revision: 5.5x - S1