Product Type: Metal Electrical Distribution Box. Brand: Bosma. Specifications: Operates at 15 Amps and 500 Volts, Three-Phase (T.P.). Country of Manufacture: India. This product is an old Main Switch from the Indian company BOSMA, estimated to be around 50 to 60 years old, dating back to the late 1960s or 1970s. Here are the historical and technical details that confirm this: Company History (BOSMA): The company's brand was founded in India (Bombay) in 1957 by "Jamnadas Vora", and the trademark for electrical switches was officially registered in 1967. Technical Design Nature: The box is made of heavy cast iron with a side manual operating lever, which was a very common engineering and industrial style in installations and homes during the mid-20th century before the transition to plastic boxes and modern panels. Engraved Specifications: The switch carries electrical specifications for old and high-endurance systems: 15 Amps capacity, 500 Volts voltage, and it is Triple Pole (T.P. stands for Triple Pole).