This part is a kind of semiconductor called SA10.

Function of this product has TRANSZORB TRANSIENT VOLTAGE SUPPRESSOR.

Manufacturers : General Semiconductor

Image and pinout :

Some of the text within the PDF file :

SA5.0 THRU SA170CA TRANSZORB™ TRANSIENT VOLTAGE SUPPRESSOR Stand-off Voltage - 5.0 to 170 Volts DO-204AC Peak Pulse Power - 500 Watts FEATURES 0.034 (0.86) 1.0 (25.4) MIN. 0.028 (0.71) DIA. 0.300 (7.6) 0.230 (5.8) 0.140 (3.6) 0.104 (2.6) DIA. 1.0 (25.4) MIN. ♦ Plastic package has Underwriters Laboratory Flammability Classification 94V-0 ♦ Glass passivated junction ♦ 500W peak pulse power surge capability with a 10/1000µs waveform, repetition rate (duty cycle): 0.01% ♦ Excellent clamping capability ♦ Low incremental surge resistance ♦ Fast response time: typically less than 1.0ps from 0 Volts to V(BR) for uni-directional and 5.0ns for bi-directional types ♦ For devices with V(BR)≥10V, ID are typically less than 1.0µA ♦ High temperature soldering guaranteed: 265°C [ ... ]

SA10 PDF Datasheet Download