Most electrolytes conduct electricity when they produce ions in their fused state or in the solution state.
Lead Bromide() in its solid form is not a conductor of electricity.
They are not conducting electricity since electrons present on them are not free to move since they are present by a strong electrostatic force of attraction.
When the solid bromide is heated to its molten state it will conduct electricity since ions are produced and electrons are free to move.
So Lead bromide conducts electricity in its molten state.