A surge protective device is intended to limit brief overvoltage events reaching the circuits or equipment it serves. It doesn't supply backup power during an outage, and it isn't a repair for an existing electrical fault.
Before buying one, ask which device is proposed, where it goes and what protection the installer is recommending for your system.
The numbers aren't a simple quality ranking. Manufacturer guidance says Type 1 devices can be installed on the supply or downstream side of the main service overcurrent protection. Type 2 devices are for the downstream side.
The electrician selects the location and device according to its listing and the installation requirements. You don't need to open service equipment to compare the options.
Ask for the model, rating and listing. If protection at individual equipment is also recommended, ask what role it serves alongside the service level device.
An outage, a sustained supply problem and a transient surge are different events. A surge device isn't a guarantee against every electrical disturbance or every appliance failure.
If you're investigating repeated trips, flickering or a nonworking outlet, get that symptom assessed. Don't accept a surge product as the explanation for a fault the electrician hasn't identified.
Some products advertise connected equipment coverage as well as a warranty on the device. Get the actual terms, exclusions, limits and claims process for each.
A large advertised coverage amount doesn't tell you every damaged appliance will be reimbursed. Compare what the documents promise rather than treating the headline figure as insurance for the whole house.
Ask how to read the chosen device's indicator and what its replacement or maintenance instructions require.
Look for the device, mounting and connection work, any supporting work, permits and completion checks. If panel replacement is also proposed, ask for the reason separately. Installing surge protection doesn't automatically call for a new panel.
Confirm local permit requirements with the responsible building department. The panel guide helps if the quote includes broader changes to the electrical installation.