As the direct replacement for SP12390

While it can often replace a SPST relay by utilizing only one set of contacts

you may experience overheating or a blown internal fuse

supporting simple two-wire installations without the need for a common wire when battery-powered

It is designed to slide onto the existing pilot valve tube of the Ranco assembly

Fireye MEP108 Module 318518-761 As the direct replacement forFor veteran technicians managing commercial burner systems, the Fireye MEP108 Module is a high performance MicroM Programmer designed for non recycle operation. This plug in module integrates seamlessly into MEC120 and MEC230 chassis, providing precise microprocessor based timing that eliminates the drift associated with older discrete components. The Fireye MEP108 is characterized by a 0 second pre purge and a fixed 15 second PTFI (Pilot Trial For