Iron-cored transformers, usually embedded in resin to reduce noise. The core either has a magnetic shunt, or a gap in the iron core, both of which serve to current-limit the output, allowing them to run indefinitely in short-circuit conditions. They can also run indefinitely with no load. Iron cored varieties are quite heavy, for example a 15 kV, 60 mA device may weigh up to 20 kg (44 lb). Some newer manufactured iron cored NSTs include a large capacitor in parallel with the output for PFC (power factor correction). This serves to correct the shift in the phase of voltage and current caused by the large inductance of the transformer.
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