L&T MCX-34 2NO+2NC 255A 4 Pole Power Contactor is a device that is used to connect or disconnect an electrical circuit. It is usually operated by a switch or a circuit breaker. This contactor is great for electrical projects that require a current rating of 255 amps. The FR-4 size is perfect for most applications, and the 4 pole design means that this contactor can handle even the most complex jobs. The auxillary contact is also a great feature, allowing for more control and flexibility when using this contactor. It is also ideal for use in contactors and transformers.