@Stephanie Grady Good day, I’m a licensed electrical contractor in NJ and would be glad to help you out anyway I can. First off, this is an electric panel that uses fuses to protect the circuits in it instead of using circuit breakers, which is what you are accustomed to. The differences between the two are as follows, a circuit breaker functions like a switch, each time the circuit it protects experiences an overload situation(too many appliances using the circuit simultaneously) the circuit breaker automatically switches to the tripped (off) position. When a fuse experiences an overload situation, it shuts off completely and needs to be replaced with a new one.
Also, Installation is different as well, let’s say a circuit trips because a tenant keeps putting too many appliances on it. If your property has a panel that uses circuit breakers, the entire panel cover needs to be removed, this exposes a lot of live electric parts, and the tenant has to remove the existing circuit circuit breaker, disconnect a wire, and then reconnect the wire to a larger circuit breaker and then install that circuit breaker. This is kind of a pain to do and unsafe for the inexperienced, however if a tenant wishes to upsize a fuse that keeps blowing, they just unscrew the fuse and install a larger one.
Now, please note, this practice is highly illegal because circuit breakers and fuses are sized based the size of wires they protect. If a tenant were to upsize the fuses, it is a major fire hazard because the wires can not handle the extra amps and now the fuse will not protect the wires anymore. Worst part, you as a landlord would never know a tenant did this, unless you kept a log of your electric panel schedule, and I have yet to find a landlord who does that.
If I had an electric panel that uses fuses in a property where a tenant had access to it, I would change it out to a panel that uses circuit breakers.
If I failed to address any of your concerns, or any of this post was confusing, please contact me via DM and I can provide further clarification. Best of luck.