To prevent unwanted tripping of the circuit breaker during short voltage drops, this delay unit can be installed to delay the undervoltage trigger. The tripping only occurs if the voltage is too low for a specified period. Delay unit for undervoltage trigger 48/60V AC/DC, adjustable time. Delay time adjustable: 0.5s - 1s - 1.5s - 3s. It can be deactivated with an emergency stop switch to achieve immediate shutdown of the circuit breaker.