RTS PS-31 – Used

RTS PS-31 System Power Supply
The Model PS-31 supplies 32 volts of regulated DC power to each of three intercom channels. It has short circuit and thermal overload protection, with automatic recovery when the fault is removed

The PS-31 provides the required channel terminating impedance for each channel. A 200/400 Ω impedance select switch for each channel is located on the rear panel. These switches are set to 200 Ω for normal operation. The 400 Ω setting permits two PS-31’s to be coupled to double the DC capacity of the system.