Time relays can also be referred to as timers.

The time relay is a kind of device for delay control, which is equivalent to a timer; and the timer is equivalent to a time relay in the relay circuit, which can be used for delay control in the program.

Knowledge point extension:

The time relay is a kind of relay that needs to pass the specified precise time to generate a jump change (or contact action) when the input action signal is added (or removed). It is an electrical component used in circuits that use lower voltages or smaller currents to turn on or off higher voltage, higher current circuits. At the same time, the time relay is also a control device that realizes delay control by using electromagnetic principle or mechanical principle. It has many types, including air damping type, electric type and electronic type.