The LPC 10643-485-3 is a 5 terminal device inserted in-line for protection of equipment operating on a wire pair of 0-9 V peak. Mounting is on wire pair 66 blocks. Applications include RS422 twisted wire pairs, RS485, and other applicable wire pair systems. Mounting utilizes standard spacing (0.40 in.), single clip terminations, and screw stud ground terminal.Lightning and surge protection is provided line to line and each line to ground. Either polarity of the transient is equally clamped. Equipment to be protected is connected to wires E1 and E2. The line side (transmission line experiencing surges) is connected to wires L1 and L2. In-line resistance is 10 ohms in each line.