Pulse transformers are used for the triggering of Thyristors , IGBT etc.
Ours pulse are totally shielded transformers. It has 6 legs with equal pin to pin distance 5mm and row to row is 12.8mm . This has three isolated coils with equal ratio. Anyone can be used for the primary & others two for the secondary. Its dimensions are as L- 25MM, W-25MM, H-20MM.