NI 9481

NI 9481 is NI’s standalone C Series relay output module for switching external loads in CompactDAQ and CompactRIO systems. NI describes it as a 4-channel electromechanical SPST relay output module with screw-terminal connectivity, and lists the headline rating as 60 VDC (1 A) / 250 Vrms (2 A). This catalog entry refers to the base NI 9481 module, not the assembled NI USB-9481 device, which NI states combines an NI 9481 module with an NI USB-9162 carrier. https://www.ni.com/en/shop/hardware/digital-i-o/model-ni-9481 https://download.ni.com/support/manuals/371571d.pdf

NI’s product page identifies the primary commercial part number as 779006-01, while NI certification documentation also references assembly identifier 198863-01L for a 4-channel general-purpose SPST relay module. The module uses a screw-terminal connection, and NI lists an NI-9936 10-position screw terminal plug as an included accessory. https://www.ni.com/en/shop/hardware/digital-i-o/model-ni-9481 https://www.ni.com/en/support/documentation/product-certifications/model.ni-9481.html

Detailed electrical and operating values in the official manual are published for the NI 9481E suffix variant, so they should be interpreted carefully for the base NI 9481. In that NI 9481E manual, NI specifies 4 channels, SPST relay form, maximum switching voltage of 60 VDC or 250 Vrms, power-on output state with channels off, and a maximum switching rate of 1 operation per second. The same manual also documents a 10-terminal detachable screw-terminal connector and isolation values of 250 Vrms channel-to-channel continuous and 250 Vrms channel-to-earth continuous. https://download.ni.com/support/manuals/372621a.pdf