B3F4055 (Omron, manufacturer part number B3F-4055) is a 12 × 12 mm through-hole tactile switch with a 7.3 mm high projected plunger and silver-plated contact.
Operating force 2.55 N (260 gf) · yellow plunger
Rating 1 to 50 mA at 3–24 V DC (resistive load)
Contact resistance 100 mΩ max. (initial)
Durability 1,000,000 operations min.
Ambient temperature −25 °C to +70 °C · without ground terminal
