ITEM NAME:4 channel 4 route mosfet button irf540 v2.0+ mosfet switch module for arduino FU @media screen and (max-width: 600px) .mobiledesfromibay { display:block; width: 350px;.We designed a 4-channel MOSFET switch. MOSFET is an electronic devices with good switching characteristics. Relay is another kind of module with switching characteristics. 1 x 4CH MOSFET.