Abstract: An electrical device such as a network protector relay is protected from ambient conditions by a housing having a printed circuit board (PCB) providing a seal for the housing and air and water tight connections between relay leads and external leads. The relay leads are soldered in first plated through apertures in the PCB substrate while the external leads are soldered in second plated through apertures connected to corresponding first apertures by conductive traces on the substrate. Potting material confined by a potting dam electrically insulates the solder connections on the external side of the PCB. Components can be mounted on either side of the substrate by soldering the component pins or leads in additinal plated through apertures electrically connected to relay and/or external leads by the conductive traces.