The IDEC HW1B-A4F10-S is a robust 40mm blue pushbutton featuring a maintained operation with one Normally Open (N/O) contact. This non-illuminated switch from the HW series ensures safety with finger-safe IP20 contacts and tamperproof construction. It meets EN60947-5-5 standards for emergency stops and complies with SEMI S2 guidelines, making it suitable for critical applications where reliability is paramount.