Sealed electric plug

A sealed electric plug (100) comprises: one or more temperature sensors (120a, 120b) used to monitor a temperature inside the electric plug (100); a data cable (166) housed within a blocking enclosure (162) used to block electric noise so as to precisely acquire and transmit temperature data; and a housing or a supporting member (130) used to receive the one or more temperature sensors (120a, 120b) and capable of being inserted into an internal casing (170) of the electric plug (100) and positioned near one or more pins (102, 104, 106). One or more sealing members (910) can be placed at the one or more pins (102, 104, 106), the internal casing (170), and regions at connections between wires of the data cable (166), thereby insulating the internal casing (170) from air, moisture and particles.