Learn the pin configuration and wiring method for an 8‑pin timer relay to control loads with delay. Includes coil connections, NO/NC contacts, and timing logic.
multiple switch one light
A 1-light, 4-switch circuit connection can enable you to switch a light on or off at any of four switches. This is done by use of two (2) 2-way (SPDT) switches and two intermediate switches (DPDT or 4-way). This installation is often in a large hall or staircase when there are several access points to the light in question. The wiring layout and the way the switches link are imperative to shun confusion or short circuits. The simplified explanation and diagram are given below, which can be followed easily.
timer relay wiring diagram
An 8‑pin timer relay is used to control electrical loads with a preset delay using a DPDT contact arrangement. It provides both normally open and normally closed outputs across two separate channels. Understanding its pin configuration helps ensure safe and efficient circuit wiring for motors, lamps, and automation systems.
8 pin timer connection
| Pin | Function | Type | Notes |
|---|
| 2, 7 | Coil | Power Input | Apply voltage to activate timer |
| 1 | COM 1 | Contact | Switches between NC (4) & NO (3) |
| 8 | COM 2 | Contact | Switches between NC (5) & NO (6) |
What is an 8‑pin timer relay?
A timer relay with coil, two common contacts each with NC and NO terminals.
Which pins are for the coil?
Pins 2 and 7 are used for the coil (L and N supply) on most models.
How are relay contacts arranged?
Pins 1 & 8 are COM; 1 NC‑4/NO‑3; 8 NC‑5/NO‑6 contacts.
Which pins are NO and NC?
Pin 3 & 6 are NO; pin 4 & 5 are NC relays.
Can the timer drive motors?
Yes, in auto ON/OFF circuits for motors using appropriate rating.
Is this a DPDT timer?
Yes, two separate poles each with NC/NO outputs.
What voltage is coil rated?
Common options: 12 VDC, 24 VDC, 110 VAC, or 220 VAC depending on model.
Can I wire it without a diagram?
It’s risky; pin numbering and logic vary—always follow manufacturer pinout.
Do I need MCB protection?
Yes—use a SP or DP MCB/RCCB rated for coil and load currents.
How do I use it for delay ON/OFF?
Apply coil voltage to start delay, contacts change after set duration.
