Siemens Ignition transformer ZM20/10 00425173

This Siemens ignition transformer is used to ignite the fuel-air mixture in burners and boilers. It operates from a 230 V, 50 Hz supply and produces a secondary voltage of 10 kV. The primary current is 1.1 A and the ignition current is 20 mA. It has a duty cycle of 33% at 3 minutes. The screw thread connection accepts the ignition cable. This two-pole transformer is active only during the ignition period.

For this class of ignition transformer, replacements must match the primary voltage (for example 230 V, 110 V or 24 V), secondary voltage and current, and the duty cycle required by the burner. Verify the mounting arrangement, terminal type and the pattern of the high-voltage cable connector against the original part. Also check the condition of the ignition cable and electrode gap, since cable deterioration can cause ignition failure even with a correctly selected transformer.