OEM part, new in box and pack of 10 units Part number: ATMR20 Size: 10.4 x 38.1 mm The ATMR is a popular choice for economical protection of control circuits and control circuit transformers where available short circuit currents exceed 10,000 amperes. ATMR’s rejection dimensions prevent substitution by lesser rated fuses. These fast acting fuses give currentlimiting protection to general circuits.