Kromschroder Ignition transformer TZI 8-20/33QT 84391141

This Kromschroder ignition transformer (model TZI 8-20/33QT) steps up a 120 V AC supply to a secondary voltage of 8 kV, providing 16–20 mA at 50–60 Hz. It has a duty cycle of 33% and a single-pole output to ground. The transformer operates only during the ignition period and is intended for installation in a control cabinet. It is suitable for gas and gas-oil burners and carries CE, UL, and CSA certifications.

Parts of this type are selected by secondary voltage and current, primary voltage, duty cycle, mounting style, terminal type, and cable connector pattern. Before ordering, confirm that the primary voltage matches the burner supply and that the mounting pattern and terminal arrangement fit the existing bracket and wiring. The ignition cable between the transformer and electrode must be silicone-insulated to withstand high voltage and heat.

A common failure mode is a hardened or cracked ignition cable that leaks the spark to earth, which may be mistaken for a faulty transformer. The burner may fail to ignite or show intermittent ignition. Check the cable and electrode condition before replacing the transformer.