This is an Original Thermo King part for type Unit:
KD-I                          
UMD 20DG                      
URD 25DG                      
URD-III 50 MAX TCIA           
UT-1200X met TK3'7'6
UTS                           
ThermoKing Part Description:
BREAKER - circuit
BREAKER - circuit (50 amp)
BREAKER - circuit (auto reset)
BREAKER - circuit (CB1)
Thermo-King no. 44-5575 / 1084A99G35
Description on Article: 
Breaker 12V 50A
Examples and applications or 
Names and unit codes: 
TK44-5575 / TK-445575 / TK.44.5575 / TK445575 / TK44-5575TKA / TK-445575TKA / TK.44.5575TKA / TK445575TKA
UTS                                                                                                                                                         
KDI / KD I / KD1 / KD 1 / KD-1                                                                                                                              
HattinkThermo-Parts.ComUMD20DG / UMD 20 DG                                                                                                                                         
UT_1200X
URDIII50MAXTCIA / URD III 50 MAX TCIA / URD-III-50-MAX-TCIA / URD350MAXTCIA / URD 3 50 MAX TCIA / URD-3-50-MAX-TCIA                                         
UT/1200X
URD25DG / URD 25 DG                                                                                                                                         
UT1200X
AMP Breaker / 12v breaker / 12v safty switch / AMP Breaker / 12v breaker / 12v safty switch / Safty switch / AMP breaker / amp protection switch / elektro protection switch /