MTL4500 range MTL Digital Input modules MTL 4516, stock MTL 4516 isolated barrier for sale. MTL 4501-SR MTL 4504 MTL 4510 MTL 4510B MTL 4511 MTL 4513 MTL 4514 (B)(D) MTL 4516 MTL 4516C MTL 4517 MTL 4521 MTL 4521L MTL 4523 MTL 4523L MTL 4523R MTL 4523V MTL 4523VL MTL 4524 MTL 4524S MTL 4525 MTL 4526 MTL 4531 MTL 4532 MTL 4533 MTL 4541 MTL 4541A MTL 4541AS MTL 4541B MTL 4541P MTL 4541S MTL 4541T MTL 4544 MTL 4544A MTL 4544AS MTL 4544B MTL 4544D MTL 4544S MTL 4546 MTL 4546C MTL 4546S MTL 4546Y MTL 4549 MTL 4549C MTL 4549Y MTL 4561 MTL 4575 MTL 4576-RTD MTL 4576-THC MTL 4581 MTL4599 MTL4599N