Power transformers are highly sophisticated, motionless electric machines. The start-up process is also a highly sophisticated matter, involving high currents, but without causing the fuse to trip. On the other hand, though, the power circuit must be reliably interrupted if excessively high currents flow for an excessively long time. In this particular area, standards can provide general recommendations only – but thanks to our many years of experience, we knowexactly what fuse is needed to take care of what situation.