OPTB4I/O Card by Eaton, Cutler Hammer or Westinghouse EATON EXTENDED I/O CARD 1 ANALOG IN & ANALOG OUT (mA, ISOLATED) +24 VEXT + 24 V CAT# OPTB4 New Surplus Inventory Code: A Make an Offer Send to a Friend WHSE Code: M3B5 Return To Misc Electrical Components and Parts