I came across a 30 amp/125 Volt “Murray Safety Switch” in an older home today (see pics)…house built ~1927. This is the first I have seen this model of device and was looking for any expert advice (were these used as the homes main service panel back in the day?). The home does have an upgraded electrical service panel (200 amp service with circuit breakers) at the rear of the structure that appear to be servicing the entire home. However, when I did a quick check of the wiring using a voltage pen detector, it indicated live wiring entering/exiting the switch…which confused me. Based on the live wiring entering/exiting the switch, I recommend further evaluation by a licensed electrician. Any thoughts/suggestions?
Thanks in advance.