Delta-T Alert™ is a wireless, self-contained temperature-monitoring sensor that attaches to an electrical enclosure cover. The patented, Delta-T Alert™ unit is simple to install and comprises of two temperature sensors – one to monitor the electrical enclosure’s interior temperatures and the second to monitor the ambient room temperature where the enclosure is located. The Delta-T Alert™ sensors are then configured to collect data daily, at specific time intervals. The data is wirelessly transmitted for analysis and trending and warns the operator of abnormal temperature rises within their electrical enclosures before more serious problems occur. As a result, Delta-T Alert™ provides an easier, more effective way to prevent costly electrical damage and system downtime.