The 84-5340.0040 is an emergency stop switch designed for human-machine interface applications requiring reliable emergency shutdown capability. It features a red-white mushroom-head lens with a 32 mm front diameter and 22.3 mm panel mounting cutout, constructed from UL 94 V0 plastic material for enhanced safety. The switch employs a maintained switching action with a slow-make switching element, offering 2 normally closed contacts with forced opening per EN 60947-5-5, and is rated for 120 VAC at 3 A or 240 VAC at 1.5 A with silver gold-plated contacts. Key electrical specifications include a rated operational voltage of 250 VAC/DC, electrical lifetime of 50,000 cycles, and mechanical lifetime of 250,000 cycles, with an operating force of 20 N ±4 N and approximately 4 mm operating travel. The switch is certified to EN 60947-5-1, EN 60947-5-5, and DIN EN ISO 13850 standards, with IP65/IP67/IP68 front protection and IP20 rear protection, making it suitable for industrial control panels, machinery safety systems, and emergency shutdown applications across diverse environmental conditions.