The 8WD4408-0AD with Signallers accessories is an 8-way double-pole relay base manufactured by Siemens. This relay provides 8 signal outputs with a voltage rating of 8 V DC. It can be used to control lights, pumps, motors, valves, and other devices. The base includes features such as status indication (LEDs for indication of output signals), signal input test buttons for each output, power contacts for external control, and a plug-in facility for connection to external control signals. The product also includes additional equipment such as a signaller plug, which is used to provide additional cabling for the signal outputs and a connecting plate for the additional plug. This base is designed for use with Siemens Signalling Equipment.