The ETN series is a set of tough and reliable flasher relays. It provides industrial machinery with timed sequence delay, soft-start delay or auto-start function, thus enhancing its protection. The machinery also serves conveyor belts, exhaust fans, heating systems, and lubricators. When a supply voltage is applied, the OFF delay or T1 will begin. The load will be energized at the completion of this delay, and then the ON delay comes into operation. When it ends, one cycle is complete and the load is de-energized. This ON/ OFF cycle persists as long as the supply voltage is applied. The OFF delay equals the ON delay.