The IDEC YW1B-V4E21R is a compact emergency stop button featuring a 40mm red mushroom head for quick actuation. It includes 2 Normally Open (NO) and 1 Normally Closed (NC) contacts within a space-saving, 10mm thick contact block. The device's removable operator and lightweight design facilitate easy handling and installation. Equipped with a durable metal bezel, it also offers unibody pilot lights and key selector switches for additional functionality. The separate contact block design simplifies installation and maintenance processes.