Epsilon Electronic Equipment & Components Pvt. Ltd. Supplies Fail Safe Electronic Time Delay Unit. Epsilon Electronic Equipment & Components Pvt. Ltd. Manufactures signal & telecom items for the Indian railways. Fail Safe Electronic Time Delay Unit is supplied for 24VDC or 60VDC and the time setting can be for 60 secs or 120 secs. This Fail Safe Electronic Time Delay Unit is assembled on Q type Relay Base. This relay energizes the DC Line Relays after a time delay of 60 secs or 120 secs, as per the factory setting.