A mounting adapter for mounting a device on a support rail includes a central body, at least one rail attaching member, and at least one detent. The rail attaching member projects rearward from the body and is configured for releasable attachment to at least one of the upper and lower flanges of the support rail. The detent projects forward from the body. The detent is resiliently deflectable relative to the body and configured for releasable attachment to the electronic device.