HIMA F3237 8 Channel Safety-Related Input ModuleFunction: It reads signals from safety related proximity switches and monitors for malfunctions like short circuits and wire breaks. Channels: It has 8 channels for connecting input devices. Safety Rating: It meets safety requirement class AK 1 to 6, making it suitable for safety critical applications. Here are some additional details to consider: Supply Voltage: 8. 2 V Operating Current: Varies depending on voltage Dimensions: 5 x 18 x 25 cm Weight0.