Dimplex EUAR31 24-Volt Relay/Transformer Kit for 240-Volt Industrial Unit Heaters Low-voltage relay/transformer kit with 24 volts of power Designed for use with a 240-volt industrial unit heater Should be mounted to grounded metallic box only Color-coded wires for easy installation; UL listed Measures approximately 5 by 7-1/5 by 5-4/5 inches