What the Ratings Mean for Fit
The 2TLA042022R4600: The '4 OSSD IN' designation tells you this relay accepts four OSSD inputs, which typically come from a pair of light curtains or a multi-beam array. In a guarding application, each OSSD pair from the light curtain connects here. The relay's internal logic checks that both OSSD signals are present and alternating correctly — if one drops out or a short circuit is detected, the relay opens its safety contacts and stops the machine. That's the core function: it's the decision-maker between the light curtain and the contactors that kill power to the hazard zone.