The Mitsubishi HG-SR301BJ is a 3.0 kW servo motor from the HG-SR series, spinning at 1000 r/min. It ships with an electromagnetic brake and an oil seal — the 'B' and 'J' suffixes respectively — so it holds position when power is removed and resists oil ingress on the shaft, which matters for vertical-axis or lubricated-machine applications.
Rated for indoor use away from direct sunlight, corrosive gas, flammable gas, oil mist, dust, and dirt. Ambient temperature range is 0 °C to 40 °C during operation, non-freezing, with humidity up to 80 %RH non-condensing. Altitude limit is 1000 m above sea level. Vibration resistance is specified at 24.5 m/s² on the X axis and 29.4 m/s² on the Y axis — figures that matter when the motor is mounted on a moving gantry or a machine tool carriage.