Epsilon Electronic Equipment & Components Pvt. Ltd. Offers Block Bell Equipment. Epsilon Electronic Equipment & Components Pvt. Ltd. Supplies signal & telecom items for the Indian railways. Block Bell Equipment is used in 25KV AC electrified area. Block Bell Equipment is part of the block instrument which is provided at the end of block section at Cabins / ASMs. This is used in AC electrified area to convert the DC impulses to AC at the sending end and AC impulses to DC at the receiving end. This equipment works on 24V DC.