PB1L metal series pushbuttons adopt the structure of modular combination consisting of single-chip clip-on type contact module and luminescent module, which is reliable and convenient for installation and maintenance. The materials comply with the requirements of EU RoHS standard and the protection class of heads reach up to IP65. The contact module with self-cleaning function has the contact reliability of ppm grade. The luminescent module designed as integrated structure has complete voltage specifications with low energy consumption.