Siemens-Converter-Control-24V-For-Semiconductor-Relay-Siemens-3RF2900-0EA18-p-This-device-converts-an-analogue-input-signal-&-converts-it-into-a-PWM-digital-signal-for-controlling-SSRs-The-units-are-designed-to-clip-on-to-the-3RF21-&-3RF23-range-of-solid-state-relays-p-Siemens-3RF2900-0EA18-Converter-Control-24V-For-Semiconductor-Relay