This Lot (Qty.10) is New Raychem/Tyco/TE Connectivity Polyswitch SMD Resettable Fuse,  Part Number: SMD100-02 Internal part number: 434213-000. The device allow the circuit to open when exceed certain current in order to protect the circuit. It will reset to normal when current is normal.

General Spec for SMD100-02:

• Hold Current: 1.1A
• Trip Current: 2.2A
• Maximum Voltage: 30V
• Maximum Current Without Damage: 40A
• Maximum Power Dissipation: 1.7W
• Initial Resistance: 0.048 Ohm
• Operating temp: -40C to +85C
• No Manual Resetting or Replacement

Data Sheet(note following data sheet is for RoHS version SMD100F-2, but part we sell here is non RoHS version without F, F stand for RoHS Version):

http://www.mouser.com/catalog/catalogusd/646/749.pdf

http://www.te.com/catalog/pn/en/RF0318-000

http://rfbayinc.com/upload/files/data_sheet/smd_polyswitch.pdf