This Lot (Qty.10) is New Raychem/Tyco/TE Connectivity Polyswitch SMD Resettable Fuse,  Part Number: SMD050-2. The device allow the circuit to open when exceed certain current in order to protect the circuit.

General Spec for SMD050-2:

• Hold Current: 0.5A
• Trip Current: 1A
• Maximum Voltage: 60V
• Maximum Current Without Damage: 10A
• Maximum Power Dissipation: 1.7W
• Initial Resistance: 1.4 Ohm 
• Operating temp: -40C to +85C
• No Manual Resetting or Replacement

Data Sheet (RoHS Version SMD050F):

http://rfbayinc.com/upload/files/data_sheet/smd-050f-2.pdf

http://www.te.com/catalog/pn/en/RF0315-000

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