In some aspects, a configurable multi-pole relay system is provided. The configurable multi-pole relay system can include a first relay module, a second relay module, and a connecting structure. The first relay module can include a first switch that can be electrically connected to a first electrical circuit. The second relay module can include a second switch that can be electrically connected to a second electrical circuit. The connecting structure can include first and second physical connectors. The first physical connector can be attached to a first interlocking portion of the first relay module. The second physical connector can be attached to a second interlocking portion of the second relay module.