This part is a kind of semiconductor called SA10.

Function of this product has 5.0 thru 170 volts 500 Watts Transient Voltage Suppressors.

Manufacturers : Microsemi Corporation

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Some of the text within the PDF file :

8700 E. Thomas Road Scottsdale, AZ 85252 Phone: (480) 941-6300 Fax: (480) 947-1503 FEATURES: • • • • • ECONOMICAL SERIES AVAILABLE IN BOTH UNIDIRECTIONAL AND BI-DIRECTIONAL CONSTRUCTION 5.0 TO 170 STAND-OFF VOLTAGE AVAILABLE 500 WATTS PEAK PULSE POWER DISSIPATION QUICK RESPONSE SA5.0 thru SA170A DESCRIPTION: This Transient Voltage Suppressor is an economical, molded, commercial product used to protect voltage sensitive components from destruction or partial degradation. -12 The response time of their clamping action is virtually instantaneous (1 x 10 seconds) and they have a peak pulse power rating of 500 watts for 1 ms as depicted in Figure 1 and 2. Microsemi also offers a great variety of other Transient Voltage Suppressor's to meet higher and lower power demands and special [ ... ]

SA10 PDF Datasheet Download