Cofi Ignition transformer TRK2-40SHK

The Cofi TRK2-40SHK is an ignition transformer designed to generate a high-voltage spark for ignition systems in liquid fuel and gas burners. It operates with a supply voltage of 220–240 V and a frequency of 50–60 Hz. The transformer has dimensions of 80 mm in length, 60 mm in width, and 40 mm in height, with a net weight of 0.335 kg. It is packaged in a box measuring 170 mm by 90 mm by 55 mm, with a gross weight of 0.37 kg. This model is suitable for use in boiler installations and automatic ignition systems.

When selecting a replacement ignition transformer of this type, key parameters to match include the primary voltage (typically 230 V, but 110 V and 24 V variants exist), secondary voltage and current, duty cycle, mounting arrangement, and terminal configuration. The connector pattern for the ignition cable must also be compatible. Before ordering, measure the physical dimensions and compare them with the existing unit to ensure proper fit. The ignition cable must be silicone-insulated to withstand high voltage and heat.

Common failure modes for ignition transformers include internal short circuits, open windings, or insulation breakdown, which can result in no spark or a weak spark. Equipment may fail to ignite, causing the burner to lock out after repeated ignition attempts. Before replacing the transformer, inspect the ignition cable and electrode insulator for cracks or hardening, as these can leak the spark to earth and mimic a defective transformer.