An enclosure for an electrical device includes a five-sided case with an open side closable by a removable cover. First and second pocket plates are mounted in the case and ogether with a side wall of the case define a compartment for receiving the electrical device. The first pocket plate flexes away from a side wall of the case to enlarge the opening into the compartment for receiving the electrical device. Once the electrical device is in the compartment the first pocket plate is biased into engagement with the device to retain it in the compartment. The second pocket plate is spaced from the back wall of the case to prevent contact between the electrical device and the back wall.