The IDEC HW1B-A4F20-R is a robust 40mm red pushbutton from the HW series, designed for maintained operation with 2 normally open (N/O) contacts. It features finger-safe IP20 contacts and tamperproof construction for enhanced safety. This non-illuminated pushbutton meets EN60947-5-5 standards and complies with SEMI S2 guidelines, ensuring reliable performance in critical applications.