I would like to use a 12V relay in my LTspice circuit, however there is no relay in the component list.
How can I do?
Relay model: SRD-12VDC-SL-C
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As @KevinWhite said, you can use a voltage controlled switch. Here is an example of a very rough model for a relay:
And this is the result of the simulation:
The model is very rough because:
Both points above can be neglected unless you need to simulate the exact behavior of the relay under transient conditions (switching delays, oscillations, contact bounces, etc.).
An inductor in series with the coil resistance can be useful to simulate the inductive kick the relay produces when switched off.
You can use a voltage controlled switch to simulate the contacts (Just called SW in LTSpice).
Set the operating voltage to match pull-in voltage of your relay.
You can use a resistor (and an inductor if desired) to simulate the relay coil.