This Stopper® Station, key-to-activate push button switch, with shield with sound, is housed in a curved shell with HVAC SHUT-DOWN messaging. Interchangeable or replaceable N.O. or N.C., SPST gold-plated contact blocks rated for 3 amps @ 600 VAC or 1 amp @ 250 VDC. Standard switch includes one N.O. and one N.C. contact. Holds up to three individual isolated contacts. Part of the Stopper® Station series, which is a multipurpose push button series that covers a wide range of applications both indoors and outdoors. This product's unique, curved design helps protect against accidental activation.