5V relay module with a NE555 (timer) IC. By adding this timer it is possible to set a delay of 0 to 10 seconds before this relay switches on.
The module is initially off and turns on after X seconds. You can also use the NC output, this input is connected in the beginning and turns off after X seconds. The status is not reset until the power is removed from the module.
Connection diagram: The terminal block next to the relay has 3 connection points NC, COM and NO. On the other side is the input (+ and -). The + is closest to the capacitor and is marked with + or VCC.