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A relay board is an electrical assembly that houses multiple relays to switch high-power loads in boiler and burner systems. It is commonly used to control pumps, fans, valves, or ignition components, ensuring reliable on/off operation. In heating equipment, a functioning relay board is essential for proper sequencing and safety. This spare part is a practical solution for technicians repairing control panels or replacing worn-out relay modules in gas burners and other heating devices.