From our inventory we are selling a Allen Bradley Allen Bradley 440R-C23017 Ser B Dual MSR6R/T Channel Safety Relay Unit 24VAC/DC Ser B Dual Channel Safety Relay Unit 24VAC/DC . Specifications: Model #: 440R-C23017 MSR6R/T More Information: 24V DC/AC power Saftey inputs: 2 N.O. X1-X2 Contactor Monitor Loop: Normally Closed contactor loop Relay Output: 3 N.O. and 1 N.C. use with gate interlock and emergency stop buttons.