The 84-5031.2B20 is an Emergency-stop Switch with gold-plated contact, red plastic lens, mushroom lens profile, opaque lens optics and 1NC (SPST) + 1NO (DPST) contact type. 2.8 x 0.5mm plug terminal connection method. Snap-make switching element. 100% switching reliability and foolproof, even in harsh environments. Small behind-panel depth.