De Dietrich Ignition transformer S62750

The De Dietrich S62750 ignition transformer, type designation ZAG1, is an OEM component for De Dietrich MCR…MI boiler series. It steps up the mains voltage to generate a high-voltage spark at the ignition electrode gap, operating only during the ignition phase under burner control. The transformer is designed for spark ignition in burner systems of the specified boiler series.

When selecting a replacement ignition transformer, key parameters include secondary voltage and current, primary voltage, duty cycle, mounting and terminal type, and the cable connector pattern. Primary voltage is typically 230 V, but 110 V and 24 V versions exist. Always verify that the replacement matches the original in electrical ratings and physical mounting to ensure correct integration with the burner control and electrode assembly.

Ignition cables are silicone-insulated to withstand high voltage and heat; a hardened or cracked cable can leak the spark to earth, which may be mistaken for a faulty transformer. Other issues such as moisture ingress, internal breakdown, or debris on the high-voltage output terminals can also cause ignition failure.