ASCO Model 138 (Edco RJA-RJD Series) Surge Protective Device
Low Voltage DC | 0.200kA
The ASCO Model 138 incorporates female jacks in and out. The ANALOG Model 138 voltage clamp is set for C.O. Trunks and Analog Telephone Extensions (with ring in voltage), and the DIGITAL Model 138 voltage clamp is set for Digital Extensions (no ring in voltage).