The Omron D4NL2DFAB4 is a key-actuated safety door switch with a mechanical lock, built for guarding access on industrial machinery. The 4NC contact configuration gives you dual-channel monitoring for the safety circuit — each NC pair can be wired to a separate safety relay input, which catches a welded contact or a shorted wire before the machine starts. IP67 means the housing and the key entry survive washdown; this is the right part for food, beverage, or chemical lines where you hose the guard down at the end of a shift.
Switching current is 3 A at 240 V AC and 270 mA at 250 V DC. Mechanical life is rated at 1 million cycles, electrical life at 500,000 cycles at the rated load. The head rotates to four directions, so you can align the key entry to the guard door swing without reworking the mounting bracket.