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Omron R88M-K40030H-S2 — front view of the G5 servo motor showing the 60 mm mounting flange, the straight shaft with keyway, and the encoder cover on the back of the housing

Omron R88M-K40030H-S2 — Servo Motor, 400 W, 3000 rpm

SKU: R88M-K40030H-S2

USD 175.00

Accurax G5 K-series servo motor, 400 W, 3000 rpm, 200 V, 1.27 N.m, keyway shaft, no brake.

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Product Overview

The Omron R88M-K40030H-S2 is a 400 W AC servo motor in the Accurax G5 line, with a rated speed of 3000 rpm and a rated torque of 1.27 N.m at 200 V. The 'K4' marks 400 W, '0030' marks the 3000 rpm speed rating, 'H' marks the 200 V / no-brake configuration, and 'S2' marks a straight shaft with keyway. The motor pairs with any R88D-KNxxx-ECT / R88D-KTxxx drive in the Accurax G5 family, with 20-bit incremental encoder feedback as standard. It is the standard pick for mid-power axes on packaging, material-handling, and small machine-tool machines that need a keyway shaft for a mounted pulley or pinion.

Why 400 W without a brake

The H suffix means no holding brake. For vertical axes (Z-axis on a press loader, lift on a stacker crane) that need the motor to hold position when de-energised, choose the R88M-K40030H-BS2 (with 24 VDC brake). For horizontal axes (conveyors, indexers) where coast-down is acceptable, the non-brake H version is the right pick and saves the cost and wiring of the brake circuit.

Shaft and mounting

The S2 suffix is straight shaft with keyway, which is the standard pick when the load couples to the motor through a pulley, pinion, or coupling that needs a keyed connection. For a smooth round shaft (no keyway), pick the S1 suffix. For an oil seal, add the O-ring option. The motor face matches the standard 60 mm Accurax G5 mounting flange used across the 100 W to 750 W range.

Before ordering

Confirm the drive is rated 400 W at 200 V, such as the R88D-KN04H-ECT (with EtherCAT) or R88D-KT04H (analog / pulse). Confirm the load inertia is within the 20-30 x rotor inertia range the drive supports; higher ratios need a larger motor or a gearbox. Order the matching encoder cable and power cable from the R88A-CAGxxx and R88A-CAFxxx series.

Key Features

  • Accurax G5 K-series AC servo motor
  • 400 W rated power, 3000 rpm rated speed
  • 1.27 N.m rated torque, 200 V supply
  • 20-bit incremental encoder as standard
  • Straight shaft with keyway (S2 suffix)
  • No holding brake (H suffix)
  • Insulation class B, IP67 body (excluding shaft)
  • SKU: R88M-K40030H-S2
  • Series: Accurax G5 K-series servo motor
  • Voltage: 200 VAC

Best-Fit Applications

  • Index table drive on a small packaging or assembly machine
  • Conveyor belt drive on a sortation line at 3000 rpm
  • Pinch roller or feed roller drive on a film line
  • Small X-Y table on a pick-and-place or dispenser machine
  • Palletiser axis drive for medium-speed horizontal travel axes

Buying Checklist

  • Choose R88M-K40030H-S2 for 400 W, 3000 rpm, no brake, keyway shaft.
  • Choose R88M-K40030H-BS2 for the same motor with a 24 VDC brake.
  • Choose R88M-K75030H-S2 for the next size up at 750 W.
  • Choose R88M-K40030T-S2 for the same motor with absolute encoder.
  • Choose R88D-KN04H-ECT for EtherCAT or R88D-KT04H for analog / pulse.
  • Confirm the load inertia is within the drive's accepted range.

Technical Specifications

Series Accurax G5 K-series servo motor
Rated Power 400 W
Rated Speed 3000 rpm
Rated Torque 1.27 N.m
Max Torque 3.82 N.m (instantaneous)
Rated Voltage 200 VAC
Rated Current 2.4 A per phase
Encoder 20-bit incremental (131072 ppr)
Shaft Straight shaft with keyway (S2)
Holding Brake None (H suffix)
Compatible Drives R88D-KN04H-ECT / R88D-KT04H
Protection Rating IP67 (excluding shaft entry)

FAQ for R88M-K40030H-S2

What is the difference between R88M-K40030H-S2 and R88M-K40030H-BS2?
Both are 400 W 200 V motors at 3000 rpm with a keyway shaft. The H-S2 (this SKU) has no brake; the H-BS2 adds a 24 VDC holding brake for vertical axes that must hold position when de-energised. Pick H-S2 for horizontal axes where coast-down is acceptable; pick H-BS2 when the load needs to hold.
Which Accurax G5 drive pairs with this motor?
The R88D-KN04H-ECT (400 W, 200 V, EtherCAT) or R88D-KT04H (400 W, 200 V, analog / pulse with safety) are the standard pairings. Both drives accept the 20-bit incremental encoder of the K40030H-S2 and run the full Accurax G5 tuning toolset in CX-Drive.
What cables are needed for this motor?
Order the R88A-CAGxxx series encoder cable and the R88A-CAFxxx series power cable, in 3 m, 5 m, 10 m, or 20 m lengths. The brake wires (if fitted on the BS2 variant) use the R88A-CAHxxx brake cable. Avoid running the encoder cable parallel to the power cable.

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