Overcurrent is a common cause, where too much current flows through the relay, generating excessive heat. 5 A) and I'm using a Bosch DC relay to do it (exact part is pictured; see page 6 of the datasheet). The issue is that the coil and contacts get very hot (can't touch with a finger) after 5-10. Distribution boxes are the unsung heroes of our electrical systems, quietly managing power until something goes wrong. When they start tripping, overheating, or making strange noises, it's more than just an inconvenience - it's your home's cry for help. Other causes include poor ventilation, which traps heat, and prolonged use, which wears out the. However, for distribution boxes operating under the scorching summer sun, due to direct sunlight, heat reflection from cement ground, and heat generated by the equipment inside, the temperature inside the box can sometimes exceed 60°C.