RAC4.3-300-460-A0I-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RAC4.3-300-460-A0I-W1 is an AC main spindle drive controller from the RAC Spindle Drive Controllers series. It delivers a continuous and peak output of 93 kW, with a rated current of 300 Amps and operates at a connection voltage of 3 x AC 400 V 50 Hz or 3 x AC 460 V 60 Hz. The controller uses a mounted blower for cooling and features a width of 560 mm, a height of 1080 mm, and an IP10 protection rating.
Internal Product Review
The RAC4.3-300-460-A0I-W1 is an AC main spindle drive controller with a 93 kW continuous output that suits demanding spindle applications very well. Analog ±10 V speed set-point control and incremental encoder output support precise command handling and straightforward machine integration. Mounted blower cooling adds confidence in sustained operation, making the controller a strong choice for high-demand spindle service.
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Product Description:
The RAC4.3-300-460-A0I-W1 is an AC main spindle drive controller produced by Bosch Rexroth Indramat as part of the RAC Spindle Drive Controllers series. Intended for industrial automation, it governs high-speed spindle motors by supplying controlled three-phase power and closed-loop regulation for machining centers, grinders, and turning equipment. This allows the spindle to maintain commanded cutting speed and torque more consistently when load conditions change during drilling, milling, or other demanding machining processes.
Delivering a continuous output of 93 kW, the unit can sustain spindle operation and draw up to 300 A of line current. Heat is removed by a mounted blower, allowing full power without external liquid cooling. The housing is 560 mm wide, 315 mm deep, and 1080 mm high, which suits standard control-cabinet layouts. Peak output also reaches 93 kW, and an internal channel reports a continuous feedback rating of 60 kW for thermal modeling inside the connected CNC. The unit has no additional bleeder hardware, so external regeneration must be handled elsewhere. It also has no auxiliary encoder input, but an incremental encoder output is available for downstream speed supervision.
The controller maintains its performance up to 1000 m above sea level and carries a protection class of IP10, so guarded live parts still require the protection of a cabinet enclosure. It is compatible with 3 x AC 400 V 50 Hz; 3 x AC 460 V 60 Hz, which supports use on different plant power systems. The drive accepts an analog (+/- 10 V) speed reference, simplifying interfacing with legacy CNC analog channels. When the spindle decelerates, feedback peak power of 93 kW can be returned to the drive for energy management. The A0I code indicates the internal parameter set, and the W1 suffix indicates use with incremental encoder systems.
