The BackEMF diode that ships with Schlage and Isonas Reader-Controllers is required for low voltage DC installations with electric strikes. An industry standard 1N4007 diode can be used in its place.
For protection against other transient voltages (i.e. lightening), we recommend using a fast-switching transient voltage suppressor, such as a transient-voltage suppression (TVS) diode (or bipolar TransZorb).
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