A timer module (or time delay relay module) is an electronic circuit board used to automate the turning on and off of electrical loads after a specific time delay or in a repeating cycle.
| • Operating Voltage | Ranges from low-voltage DC (5V, 12V, 24V) to AC mains voltages (110V–220V). |
| • Timing Range | From fractions of a second (0.1s) up to thousands of minutes, hours, or full 365-day annual event schedules. |
| • Output Type | Relay (dry contact / switching AC or DC loads) or MOSFET (fast DC switching). |