20-Channel Actuator/GP Switch Module for 34970A/34972A. The Agilent (now Keysight) 34903A 20-Ch Actuator/GP Switch Module is a general-purpose switch module designed for use with the 34970A/34972A Data Acquisition/ Switch Units. It has 20 independent single-pole, double-throw (SPDT) relays. Use it to cycle power to products under test, control indicator and status lights, and to actuate external power relays and solenoids. Combine it with matrix and multiplexer modules (must be ordered separatley) to build custom switch systems. 300 V, 1A contacts can handle up to 50 W. 20 channel actuator/GP switch SPDT (Form C) latching relays 300 V, 1 A actuation and control Max. power: 50 W