This part is a kind of semiconductor called MOC3041.

Function of this product has OPTICALLY COUPLED BILATERAL SWITCH LIGHT ACTIVATED ZERO VOLTAGE CROSSING TRIAC.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

MOC3040, MOC3041, MOC3042, MOC3043 MOC3040X, MOC3041X, MOC3042X, MOC3043X OPTICALLY COUPLED BILATERAL SWITCH LIGHT ACTIVATED ZERO VOLTAGE CROSSING TRIAC 'X' SPECIFICATION APPROVALS l 2.54 7.0 6.0 1.2 Dimensions in mm 1 2 3 6 5 4 VDE 0884 in 3 available lead form : - STD - G form - SMD approved to CECC 00802 DESCRIPTION The MOC304_ Series are optically coupled isolators consisting of a Gallium Arsenide infrared emitting diode coupled with a monolithic silicon detector performing the functions of a zero crossing bilateral triac mounted in a standard 6 pin dual-in-line package. FEATURES l Options :10mm lead spread - add G after part no. Surface mount - add SM after part no. Tape&reel - add SMT&R after part no. l High Isolation Voltage (5.3kVRMS ,7.5kVPK ) l Zero Voltage Crossing l 400V [ ... ]

MOC3041 PDF Datasheet Download