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EI24 Voltage Transformer Vertical BobbinEI24 3+3 pin bobbin for current transformer/power transformer/switching transformer. Bobbin Pin Pitch=5.0mm. Bobbin Size=20.8mmX19.2mmX17.4mm. Parallel Distance=17.5mm. China transformer bobbin factory, we have been doing it over 10 years, we have experienced engineers and sales team.