For further details of contact blocks see RS ; 350-894 350-894 , for lenses see RS ; 350-917 350-917 typically For suitable T-1 midget-groove indicator lamps see RS ; 655-9205 655-9205 etc. IP67 Switch Mechanisms ; Indicators. Panel mounting switches in modular format Separate Lenses, contact elements and indicator lamps required Two contact elements may be fitted to each unit giving up to 4 N/O and 4 N/C contacts Contact ratings: 4A @ 24Vdc, 5A @ 250 Vac Standard 16mm diameter mounting