a latching arrangement for a plug - in type of electromagnetic relay employing an insulative mounting sub - base for receiving an insulative relay base . an elongated leaf spring carried by the insulative mounting sub - base and having its ends protruding beyond the top and bottom of the insulative mounting sub - base . a pair of inclined ears formed on the insulative relay base for engaging the ends of the elongated leaf spring and locking the plug - in relay to the insulative mounting sub - base . a spring biased push rod for deflecting the elongated leaf spring for causing its ends to retract and disengage the inclined ears to permit the relay to be unplugged from the insulative mounting sub - base .