The Omron D4SLN4DFA is a guard lock safety-door switch from the D4SL series, with a key-actuated locking mechanism and 4NC contact configuration. It is rated IP67, meaning the housing and terminal area are sealed against dust ingress and temporary water immersion — suitable for washdown zones in food, beverage, or pharmaceutical lines.
Switching Ratings and Service Life
Rated switching current is 1.5 A AC at 120 V and 220 mA DC at 125 V. These are the maximum continuous switching limits; the electric service life is listed at 150,000 cycles, while mechanical endurance reaches 1 million cycles. The 4NC contact set provides dual-channel redundancy for safety circuits up to PL d / SIL 3, typical for guard-door monitoring on a machine cell.
Mounting and Actuation
Dimensions are 39 mm wide by 39 mm deep by 180 mm tall, fitting a standard panel cutout for safety interlock switches. The key actuator can be inserted from four head directions, simplifying alignment on hinged or sliding guards. Termination is via a terminal block — no connector to crimp, but the wiring must be secured inside the IP67 enclosure before the cover is closed.