To prevent false tripping of the circuit breaker during short-term voltage drops, this delay unit can be installed to delay the undervoltage trigger. The tripping occurs only when the voltage is too low for a specific period of time. Delay unit for undervoltage trigger 100/130 VAC/DC fixed time. Fixed delay time of 0.25 seconds. It can be deactivated with an emergency stop switch to achieve an immediate shutdown of the circuit breaker.