Siemens 3TX7005-3AC03 Interface Relay, Narrow Design, Output Interface With Semiconductor Output, Cage Clamp Terminal, 1 NO Contact, 12.5mm Width, 2A Max Switching Current, 24-250VAC Switching Voltage, 0.05A Min Load Current, 1.5A/20ms Short Time Load Cap

Interface modules are available either with relays or semiconductors. Semiconductor interfaces offer some significant advantages: The electronic components are extremely reliable and have an extremely long service life (refer to the diagram below). The input interface combines the best of both worlds – improved technical features and a lower price. When considering output interfaces, the question of “relay or semiconductor” needs to be taken into account as well as the making/breaking capacity and the number of operating cycles. If a relay has to be replaced just once during the complete lifetime of a machine, then a semiconductor interface will already have paid for itself.