This part is a kind of semiconductor called TPB11CGRA.

Function of this product has TP Series Pushbutton Switches.

Manufacturers : Tyco

Image and pinout :

Some of the text within the PDF file :

TP Series Pushbutton Switches, Tiny, Part Number Matrix MATERIAL SPECIFICATIONS: Contacts ..Gold - gold plate, silver - silver plate Case Material..High temperature polyester Actuator MaterialPolyamide Terminals/Fixed Contacts ..Tin lead plate Terminal Seal..SP epoxy, DP epoxy optional TYPICAL PERFORMANCE CHARACTERISTICS: Contact Rating Gold: 0.4 VA Max. @ 20 VDC or peak AC Silver: 1A @ 125 VAC or 28 VDC resistive Initial Contact Resistance ..20 Milliohms max. Contact Timing ..Break-before-make Insulation Resistance ..1,000 Megohms @ 500VDC min. Dielectric Strength..1,000 [ ... ]

TPB11CGRA PDF Datasheet Download