Pushbutton Switch, DPDT, Momentary, 1A, 28VDC, Solder Terminal, Through Hole-straight
AC Input-Transistor Output Optocoupler, 4-Element, 2500V Isolation, PLASTIC, SOP-16
Optocoupler DC-IN 1-CH Transistor DC-OUT 4-Pin Ultra Small Flat Magazine

Optocoupler DC-IN 1-CH Transistor DC-OUT 4-Pin PDIP Magazine
Darlington Output Optocoupler, 2-Element, 5000V Isolation, PLASTIC, DIP-8
Switch Push Button N.O./N.C. DPDT Round Plunger 1A 125VAC 28VDC 0.4VA Momentary Contact PC Pins Panel Mount/Through Hole