SF-AC - 

Panasonic SF-AC Safety Relay
The SF-AC Safety Relay from Panasonic is compatible with PNP output (equivalent) type light curtains (SF4B-x, SF4-AHx, SF2-Ax-PN, SF2-Nx-PN, SF2-EHx). It incorporates power supply and synchronization line terminals for the light curtain, so terminal blocks are not required. Wiring on this safety relay can be performed with the terminal blocks removed so it is not necessary to detach the controller from the control panel when performing maintenance. Also, when replacing the relay units, you simply insert new terminals without having to manipulate the wiring. It is equipped with a trailing edge switching function, which causes an ON signal to be sent when the start switch signal is falling. This prevents unexpected starting which can occur if the start switch gets welded. The SF-AC relay incorporates both an auxiliary output that operates together with the light curtains control output (OSSD), and an alarm output that functions together with the light curtains auxiliary output (non-safety output). These features allow for monitoring of light curtain activity. Equipped with a hybrid fuse that enables recovery with only the reintroduction of the power supply making fuse replacement unnecessary.