NK Technologies DS3-SDT-24U

NK Technologies Current Sensing Switch solid-core case.
Type DS3-SDT-24U 
Set point Range 2-20, 10-50 and 20-100 A (DC) jumper selectable (derate by √2 for AC)
Frequency DC to 400 Hz.
Power Supply 24 VAC/DC (20 - 28 V.)
Output Type SPDT Relay (Form C)