Kromschroder Ignition transformer TZI 8-12/100QE 84391130

The Kromschroder TZI 8-12/100QE is an ignition transformer designed for industrial burners, converting supply voltage into a high-voltage discharge of 8 kV with a secondary current of 9–12 mA. It operates at a frequency of 50–60 Hz and has a 100% duty cycle, allowing continuous operation. This single-pole transformer features grounded secondary insulation and is intended for cabinet installation with IP00 protection. It is energized only during the ignition phase, as controlled by the burner management system.

When selecting a replacement ignition transformer of this type, verify that the secondary voltage and current match the electrode gap design, and that the primary voltage corresponds to the burner's mains supply. The duty cycle must be adequate for the control sequence, and the terminal pattern and cable connector must be compatible with existing wiring. Mounting forms include cabinet installation, and the high-voltage cable must be silicone-insulated to withstand heat and electrical stress.

Typical failures of ignition transformers include internal short circuits or open windings, leading to weak or absent spark. The burner may fail to ignite or experience intermittent ignition, often accompanied by a buzzing sound from the transformer. Check the high-voltage cable for hardening or cracks, as these can leak the spark to earth, mimicking a faulty transformer. Also inspect the electrode gap and insulation for wear or contamination.