Has anyone tested motorised breakers for external transfer switch applications?
The relay must close within 90 ms, otherwise the system will revert to inverter mode when switching from inverter to mains operation.
It is important to note that the transfer time to inverter mode in the event of a power failure takes as long as the relay needs to open.
To slow … is normally used for switching to generator but this one also has start up time.
1 Like
I would say spring charged motorized breakers from any of the reputable brands (Eaton, ABB, Schneider, Siemens, Mitsubishi, etc) should be able to work. On a single motor charge they should be able to perform three changes. Usually these charge the spring directly after opening.
But your would also be playing in the 250A+ territory. Below that its usual servo driven switches. Those are slow. I’m thinking about those Youtube shorts with “auto-resettable breakers” from China. With app control. I’ll happily leave those in China.
1 Like
UL listing is at least 6 cycles for a breaker listed as a ATS so 100ms+ at 60hz
a fast transfer model would be less than 2 cycles
look at data sheet for breaker and check transfer time listed in cycles or ms depending on mfg.
1 Like