1. 3V is the coil voltage. You need to put a resistor in series with a coil to get the "set voltage". Use coil resistance and voltage divider equation to find the resistor value.

2. Here's a typical circuit for driving a latching relay:

Obviously, ensure that the transistors are only turned on for a short amount of time, as they will sink reasonable current.

3. The relay contact is rated for mains voltage, so no problem.

1. 3V is the coil voltage. You need to put a resistor in series with a coil to get the correct voltage. Use coil resistance and voltage divider equation to find the resistor value.

2. Here's a typical circuit for driving a latching relay:

Obviously, ensure that the transistors are only turned on for a short amount of time, as they will sink reasonable current.

3. The relay contact is rated for mains voltage, so no problem.

1. 3V is the coil voltage. You need to put a resistor in series with a coil to get the "set voltage". Use coil resistance and voltage divider equation to find the resistor value.

2. Here's a typical circuit for driving a latching relay:

Obviously, ensure that the transistors are turned for only a short amount of time, as they will sink reasonable current.

3. The relay contact is rated for mains voltage, so no problem.

1. 3V is the coil voltage. You need to put a resistor in series with a coil to get the "set voltage". Use coil resistance and voltage divider equation to find the resistor value.

2. Here's a typical circuit for driving a latching relay:

Obviously, ensure that the transistors are only turned on for a short amount of time, as they will sink reasonable current.

3. The relay contact is rated for mains voltage, so no problem.