ELK-912B, ELK-912B6 (six modules) The ELK-912B is a heavy duty relay module featuring 12 or 24V DC selectable operation, SPDT Form "C" contacts, low current draw, voltage input LED, and high quality large cross-head terminals. It is ideal for general purpose switching of devices or high current loads. Also available in a 6 pack (ELK-912B6) which is packaged as multiple relay modules grouped on a pre-scored break-off circuit board.