I have a 12VAC-controlled contactor (ESB 20-20, rated for 12V @50Hz), and a 220/12 transformer that I intend to connect to the contactor. Unfortunately, rather than 12V, the transformer outputs 14V (which is outside of the 85—110% range of allowed voltage). Which option should I employ?
- Put a resistive voltage divider between the transformer and the contactor?
- Use two opposite 12V Zener diodes to clip a half-wave each?
- Return the transformer to the shop and try to find a more precise one?
- Throw out both the transformer and the contactor, buy a DC-driven contactor and a stabilized power supply?
- Stop caring, connect them as they are?
Edit: forgot to add, while 14V is the measure of an unloaded transformer, under the contactor load the transformer voltage drops an insignificant amount, to around 13.8V.