That I-o of 2.5 amps, is "Average Half Wave Rectified Forward current (Resistive Load, 180-degree Conduction Angle, 60 cps, Free Convection Cooling)" at 40 degrees C. It drops to 0.5 amps at 100 degrees C.
Maximum Full-Cycle Average Forward Voltage Drop (@ rated current, 40 degrees C) = 10 volts. Maximum Full-Cycle Average Reverse Current (ditto) = 3.0 mA.
The device has an operating frequency range of DC to 400 cps (Hz).
Size: 11.25" Long x 2" wide by 1.75" HIgh.
Used * No longer available for export MFR: Motorola