PS - this one http://docs-europe.electrocomponents.com/webdocs/0f35/0900766b80f35037.pdf is inexpensive and quite good for your application~~, although it will still dissipate around 5W at 18A, so you might choose to use 2 in parallel.~~
PS - this one http://docs-europe.electrocomponents.com/webdocs/0f35/0900766b80f35037.pdf is inexpensive and quite good for your application~~, although it will still dissipate around 5W at 18A, so you might choose to use 2 in parallel.~~