Iron shelves for sprouting barley or other crops With a control panel for water, electricity, and lighting. Based on the data shown in the image, these devices operate at 230/400 volts AC (Alternating Current), not 12 or 24 volts. Circuit breaker (on the left): It is a Schneider Electric brand breaker, model C60N. Clearly visible under the model name is the phrase "230/400V~", which means it is designed to work with standard household or industrial AC current. The symbol "C25" also indicates that the current capacity is 25 amps. It is noted that these devices are commonly used in electrical distribution boards to control loads operating on standard electricity (220-240 volts).