Guard-lock safety-door switch for hazardous-zone interlocking
The Omron D4SLN4EDAD is a guard-locking safety-door switch from the D4SL series, designed to interlock access doors on machinery with hazardous motion. The key-actuated lock mechanism prevents the door from opening until the machine controller signals that the hazard has been cleared — the 4NC contact configuration provides the positive-break safety signal back to the safety relay or PLC. Rated IP67, the switch body and key entry withstand washdown and temporary immersion, making it a fit for food-and-beverage lines, packaging floors, and outdoor machine guarding where hose-down cleaning is routine. The 39 x 39 x 180 mm footprint is compact for a guarded locking switch — it fits into the cutout of the D4SL family without requiring a larger panel opening than the predecessor models.
Switching capacity and contact duty
The 4NC contacts are rated 1.5 A at 120 V AC and 220 mA at 125 V DC. These are signal-level currents, not load-switching ratings — the switch feeds into a safety monitoring relay or PLC input, not directly to a motor contactor coil above its rating. Electrical life is specified at 150,000 cycles under rated load; mechanical life reaches 1 million cycles. For a guard door opened 50 times per shift, the electrical life translates to roughly 10 years of service before contact replacement is needed — the mechanical life is not the limiting factor in most production environments. Termination is via a terminal block inside the switch body — no pre-wired pigtail or M12 connector. Field wiring lands directly on screw terminals, which simplifies replacement without unseating a connector but requires access to the switch interior for installation.
Mounting orientation and actuator alignment
The switch accepts key entry from four head directions — the actuator head can be rotated to face up, down, left, or right relative to the switch body. This lets the same switch align with a sliding door (horizontal key entry) or a hinged door (vertical entry) without a separate bracket or adapter. The 39 mm width and 39 mm depth match the standard D4SL mounting pattern — replacement of an existing D4SL unit requires no panel modification or re-drilling.
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