The Heinemann AM1-A3-A Hydraulic-Magnetic Circuit Breaker is a reliable and efficient main breaker designed for electrical systems up to 250VAC. With a unit quantity of 9, this product is ideal for use in various industrial and commercial applications. The hydraulic-magnetic technology ensures quick and accurate tripping, while the brand reputation of Heinemann guarantees quality and durability. This circuit breaker is a crucial component for the protection and regulation of electrical circuits in a wide range of settings.