Review on Siemens Q120DFH Function Circuit Breaker by Amicz Kakaruk

Excellent AFCI and GFCI protection integrated in one device. I like the display, the self-test function and the built-in test button. The only problem I have with this switch is that when an APC UPS is on the load, the test button doesn't work properly (doesn't turn off the circuit breaker), but the GFCI protection still works (no AFCI test device). I have contacted Siemens regarding this and it appears to be a known issue that they are still investigating. UPDATE June 2015: No solution to my APC UPS problem. Siemens technical department said this is an APC issue and requires replacing APC's UPS or contacting APC to resolve the issue.