The 5SY4310-8 from Siemens is a 3P circuit breaker rated 10 A at 400 V AC and 72 V DC (480V), with a lever handle, DIN rail mounting and a 5K D-T rating code (SUP PTOR 5SY4).
The 5SY4310-7 from Siemens is a 3-pole DIN rail circuit breaker rated 10 A at 400 V AC (480V) and 72 V DC, with a lever handle and 5K and C-T codes (SUP PTOR 5SY4 series).