2TLA010002R0000

The JSBR4 series Safety Universal Relay for 2-handed devices. It has two inputs, which both have to be closed to keep the safety output contacts closed. A short-circuit across the inputs will cause the output contacts to open. The inputs can however be subjected to a continuous short-circuit without damaging the safety relay. In order to make the safety outputs close the reset input must be closed and opened. In this way an unintentional reset is prevented in the case of short-circuit in the reset button cable or if the button gets jammed in the actuated position. The reset input can also be used for test/supervision to ensure that contactors or valves have returned to their initial OFF "stop" position before a new start can be allowed by the safety relay. When the relay is used as a two hand relay both buttons have to be pressed within 0.5 seconds of each other in order to close the outputs.