The first high voltage coil is separated from the low voltage coil by an annular first space, and the second high voltage coil is separated from the first high voltage coil by an annular second space.

The single-phase transformer (TM) comprises a high-voltage coil (K) and a low-voltage coil (N).

A normally closed high voltage auxiliary contact is magnetically linked with the high voltage coil.

Each of the coil assemblies (12) includes a low voltage coil (30) and a high voltage coil (32).

The invention is related to a fluid insulated high voltage coil (12, 14, 16, 66), comprising a closed tank (22) for an insulation fluid (30) and a high voltage coil arranged therein with at least two taps (18, 54).

The ignition coil assembly (100) includes an ignition coil (140), a high voltage coil terminal (120), a terminals connecting insert (30) and an insulator (40).

Two branches of a tap (K1) of the high-voltage coil (K) are connected with the input of a first converter (Q＇), and a first voltage (U1＇) is obtained.

The insulator (40) can be non-detachable from the high voltage coil terminal (120) to form a non-detachable-insulator (44).

The insulator (40) can be detachable as a separate component from the high voltage coi l terminal (120) of the ignition coil (140) to form a detachable-insulator (42).

The insulator (40) provides a passageway to house the high voltage coil terminal (120), the terminals connecting insert (30), the electrode terminal (22) and portion of the resistor-type spark plug (20).

The high voltage contactor includes a high voltage coil magnetically linked with a normally open high voltage main contact.