The Schneider Electric VW3A7708 is a braking resistor from the Altivar 61 drive family. It's rated at 4 Ohm with an average power dissipation of 1 kW at 50 °C, sized to absorb regenerative energy from a decelerating motor and dump it as heat. Thermal protection is handled by the drive or a temperature control switch set at 120 °C, so the resistor itself doesn't carry a built-in thermostat — the drive or an external controller monitors the thermal switch contact.
The enclosure measures 301 mm deep, 240 mm wide, and 484 mm high — a sizable box that needs panel space or a dedicated mounting plate. Ambient operating range is 0 to 50 °C; storage from -25 to 70 °C.