Undervoltage is defined as a condition where the applied voltage drops to 90% of rated voltage, or less, for at least 1 minute. This condition if allowed to persist, can expose electrical devices to problems such as overheating, malfunction, premature failure and shut down, especially for motors (i.e. refrigerators, dryers and ...

Time delay relays are like normal relays however introduce a timing element in order to intentionally delay when the relay either turns on (energises) or turns off (de-energises). Used typically to control various types of equipment throughout many types of industries. Factory automation, production processes, lighting control, air conditioning, electrical ...