ASI SF903, Type sfr.4/DBA is a DIN rail mounted diode terminal block with 3 amp diode, Type by 255. This compact DIN rail terminal block has a user friendly lever in which the 3a diode is inserted between two screw clamp terminal connections which accept 20-12 AWG. This diode DIN rail terminal block has a Label on top showing the direction of the diode and it has a robust mounting foot for the standard DIN rail. Sold in packages of 10.