This part is a kind of semiconductor called 1N6040.

Function of this product has 1500 WATT BIDIRECTIONAL TRANSIENT VOLTAGE SUPPESSOR.

Manufacturers : Microsemi

Image and pinout :

Some of the text within the PDF file :

1N6036(A) thru 1N6072(A) Available on commercial versions 1500 WATT BIDIRECTIONAL TRANSIENT VOLTAGE SUPPESSOR Qualified per MIL-PRF-19500/507 DESCRIPTION This popular Transient Voltage Suppressor (TVS) series for 1N6036 thru 1N6072A are JEDEC registered selections for bidirectional devices. All have the same high Peak Pulse Power rating of 1500 W with extremely fast response times. They are also available in military qualified selections as described in the “Features” section herein. They are most often used for protecting against transients from inductive switching environments, induced RF effects, or induced secondary lightning effects as found in lower surge levels of IEC61000-4-5. They are also very successful in protecting airborne avionics and electrical systems. Since their r [ ... ]

1N6040 PDF Datasheet Download