na2121NA21 Datasheet. Part #: AHNA21. Datasheet: 136Kb6P. Manufacturer: Panasonic Semiconductor. Description: Relay for control panel of 1c 10A, 2c 5A and 1aNA2121-20. NA2121-21. Dimensions (mm) 340×256×54. Hole size (mm) 330×246. Display size. 12.1(Length: width = 4:3) Weht (g) 2160. Working temperature. 0℃~55℃(No freezing)