What this combo is
The MR-J4-60A+HG-SR52J is a matched Mitsubishi Electric servo system pairing the MR-J4-60A amplifier with the HG-SR52J low-inertia AC servo motor. Rated output is 0.5 kW, with a rated current of 3.2 A and peak torque of 7.2 N·m at 2000 r/min. The motor includes an oil seal (J suffix), so it's ready for applications with gearboxes or direct coupling where oil mist or splash is present.
Rated current of 3.2 A sets the continuous thermal limit for the amplifier — size your mains supply and motor cable for that, not the peak. The 7.2 N·m maximum torque is the short-term overload capability for acceleration or load disturbances; the sine-wave PWM current control method manages that peak without saturating the magnetics. The 0.5 kW rated output tells you the continuous mechanical power available at the shaft, so match it to a load that doesn't exceed that duty cycle.