Description
External contacts A and B typically are push buttons mounted 1m + apart on a press both buttons, keeping his hands safely away, before the machine operates. Apply the supply voltage. The contacts A & B must be actuated within 0.5s in order to make the relay operate. If one of the contacts is interrupted the relay will immediately release.
Ideal for use in machine safety guard systems.

OVER/UNDER SPEED & TACHO RELAY CONTROL 