Anstoss Ignition transformer FZ 4 (TYPE2) 07000740/03

The Anstoss FZ 4 (TYPE2) ignition transformer, model 973, is a spare part for ignition systems in gas and liquid fuel burners. It operates on a supply voltage of 220–240 V at 50–60 Hz, with a power consumption of 0.8 W. The transformer measures 111 mm in length, 34 mm in width, and 23 mm in height, and weighs 0.077 kg net. It is designed for ambient temperatures up to 120 °C and features silicone-insulated ignition cable. This transformer is used to generate a spark for burner ignition and is suitable for replacement in compatible systems.

When selecting a replacement ignition transformer of this type, verify that the primary voltage matches the burner's supply (commonly 230 V, but 110 V and 24 V versions exist). Check the secondary voltage and current ratings, duty cycle for intermittent operation, and mechanical details such as mounting bracket type, terminal shape, and high-voltage cable connector pattern. Ensure the ignition cable has silicone insulation to withstand high voltage and heat. Before ordering, compare the electrode gap and cable condition to the transformer's specifications.

Typical failures of this kind include cracked or hardened ignition cable insulation, which can cause spark leakage to earth and be mistaken for a transformer fault. A failing transformer may produce inconsistent or no spark, leading to burner lockout after the safety time. Check the electrode gap and fouling, as incorrect gap or dirt can prevent ignition. If the transformer fails to operate, verify the primary voltage and connections before replacing the unit.