G27471 - Optek K-8112 Opto Interrupter
Optek K-8112 opto interrupter consists of a gallium arsenide LED and a silicon NPN phototransistor. Features a 0.12" wide slot. Designed for use in high ambient light conditions. Standard 4 lead type with mounting ears. Size about 0.97" long x 0.40" tall. Dot on side indicates collector lead.