The Z15GQ21 is a basic switch from the Omron Z Series. It uses a panel-mount cross roller plunger actuator, a single-pole changeover (1CO) contact set, and terminates via solder terminals. It switches 15 A at 250 VAC for AC loads, and 15 A at 14 VDC for DC loads. The actuating force is 5.3 N, with an insulation voltage of 500 VDC. The IP00 rating means no protection against dust or moisture — it's a switch for a clean, dry panel interior.
If you're stocking spares or filling a line-down slot, this part's lifecycle status is current — it's not on any phase-out list. Source it without a last-time-buy rush.
Mounting: the panel-mount plunger requires a clean cutout in the panel. Solder terminals need a fixed wire connection — no quick-disconnect tabs. IP00 means the switch itself isn't sealed, so locate it inside an enclosure safe from dust or splash.