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New Synchronous Servo Motor Rexroth R911316378 MSK050B-0300-NN-S1-UP1-NNNN Intended For Precise Industrial Movement
| Place of Origin | Germany |
| Brand Name | REXROTH |
| Certification | CE |
| Model Number | R911316378 MSK050B-0300-NN-S1-UP1-NNNN |
The REXROTH R911316378 MSK050B-0300-NN-S1-UP1-NNNN is a compact synchronous servo motor from the Rexroth MSK / IndraDyn S series. It is designed for precision motion-control applications where compact size, accurate feedback, reliable torque output, and stable operation are required. This motor is suitable for automated machinery, compact handling systems, packaging equipment, assembly machines, small indexing units, feeder axes, printing equipment, and precision adjustment mechanisms.
The full type code MSK050B-0300-NN-S1-UP1-NNNN identifies a motor with the MSK050B frame size, 0300 winding, natural convection cooling, S1 encoder configuration, shaft with keyway and shaft sealing ring, and holding brake 1. The Rexroth order number R911316378 should be used together with the full model code when checking replacement compatibility, preparing a purchase request, or comparing the motor with an existing machine nameplate. Public supplier listings confirm this exact reference as R911316378 MSK050B-0300-NN-S1-UP1-NNNN, described as a Rexroth IndraDyn S synchronous servo motor.
For weight, the most reliable technical reference is the MSK050B motor data. Rexroth MSK050B-0300 data lists the basic motor mass as approximately 4.0 kg without holding brake and approximately 4.9 kg with holding brake. Since this exact model includes UP1, it should be treated as a brake-equipped version. Therefore, the recommended net product weight for R911316378 MSK050B-0300-NN-S1-UP1-NNNN is approximately 4.9 kg. Some online marketplace listings show a net weight around 5 kg, which is consistent with the brake-equipped reference.
Main Product Information
| Item | Specification |
|---|---|
| Brand | REXROTH |
| Order Number | R911316378 |
| Full Model | MSK050B-0300-NN-S1-UP1-NNNN |
| Product Family | MSK / IndraDyn S |
| Product Type | Synchronous Servo Motor |
| Frame Size | MSK050B |
| Winding Code | 0300 |
| Cooling Method | Natural Convection |
| Encoder Type | S1 Encoder Configuration |
| Shaft Version | Shaft With Keyway |
| Shaft Seal | Included |
| Holding Brake | Yes, Holding Brake 1 |
| Net Product Weight | 4.9 kg |
| Maximum Speed | 4300 rpm |
| Protection Rating | IP65 |
| Insulation Class | F |
| Typical Use | Compact Precision Servo Axis |
Type Code Interpretation
The Rexroth MSK type code should be checked as a complete configuration. Motors with the same frame size and winding may still differ in encoder type, shaft style, brake option, sealing, connection arrangement, and additional design code. For replacement work, the full code MSK050B-0300-NN-S1-UP1-NNNN should be matched, not only the shorter reference MSK050B-0300.
| Code Section | Meaning |
|---|---|
| MSK | Rexroth IndraDyn S synchronous servo motor series |
| 050B | Motor size 050 with B-length construction |
| 0300 | Winding variant |
| NN | Natural convection cooling |
| S1 | Singleturn encoder configuration |
| UP1 | Shaft with keyway and shaft sealing ring, with holding brake 1 |
| NNNN | Standard additional configuration |
The S1 encoder configuration is suitable for servo systems that require accurate speed and position feedback but do not require multiturn absolute position information. This is an important distinction from M1 or M2 encoder versions. If the original machine is configured for an S1 feedback interface, replacing it with a different encoder version may require drive parameter changes or may create compatibility problems.
Technical Performance Data
The MSK050B-0300-NN motor is a compact servo motor intended for precise industrial movement rather than ordinary constant-speed rotation. Technical data for the MSK050B-0300 version shows 3.0 Nm continuous standstill torque at 60 K, 9.0 Nm maximum torque, 1.8 A continuous current at 60 K, and 7.2 A maximum current. Public Rexroth product literature also lists the MSK050B-0300 motor with 4300 rpm maximum speed, 3 Nm rated/continuous torque reference, and 9 Nm maximum torque for the basic version without holding brake.
| Technical Parameter | Value |
|---|---|
| Continuous Torque at Standstill 60 K | 3.0 Nm |
| Continuous Current at Standstill 60 K | 1.8 A |
| Continuous Torque at Standstill 100 K | 3.4 Nm |
| Continuous Current at Standstill 100 K | 2.0 A |
| Maximum Torque | 9.0 Nm |
| Maximum Current | 7.2 A |
| Torque Constant at 20 °C | 1.80 Nm/A |
| Voltage Constant at 20 °C | 111.0 V/min⁻¹ |
| Winding Resistance at 20 °C | 13.10 Ohm |
| Winding Inductivity | 76.400 mH |
| Number of Pole Pairs | 4 |
| Rotor Moment of Inertia Without Brake | 0.00028 kg·m² |
| Thermal Time Constant | 8.0 min |
| Maximum Speed | 4300 rpm |
| Sound Pressure Level | Less Than 75 dB(A) |
| Operating Ambient Temperature | 0 to 40 °C |
| Degree of Protection | IP65 |
| Insulation Class | F |
Product Weight and Packing Reference
The correct listing weight for REXROTH R911316378 MSK050B-0300-NN-S1-UP1-NNNN is approximately 4.9 kg net motor weight because the model includes the UP1 holding brake configuration. This is close to marketplace references showing a net weight around 5 kg for the same full model code.
| Weight Item | Reference Value |
|---|---|
| MSK050B Net Weight Without Holding Brake | 4.0 kg |
| MSK050B Net Weight With Holding Brake | 4.9 kg |
| Correct Net Weight for R911316378 | 4.9 kg |
| Marketplace Net Weight Reference | 5.0 kg |
| Gross Shipping Weight | Must Be Confirmed Before Shipment |
| Packing Note | Carton, foam support, shaft protection, and connector protection may increase final weight |
The net motor weight should not be confused with the packed shipping weight. For export shipment, the final gross weight may include carton or wooden-case packaging, internal foam, moisture-proof wrapping, shaft cover, brake connector protection, encoder connector protection, and reinforced outer packaging. For a product listing, the safer wording is net product weight approximately 4.9 kg; gross packed weight to be confirmed before shipment.
Holding Brake Information
The UP1 configuration includes a holding brake. For the MSK050 motor size, holding brake data references include a 24 V DC electrically released brake. Earlier MSK050B brake references also show a holding brake value used for compact axis holding. The holding brake is designed to hold the shaft when the drive is disabled or when the machine is stopped, not to act as a repeated dynamic braking device.
| Brake Item | Description |
|---|---|
| Brake Configuration | Holding Brake 1 |
| Brake Function | Holds the axis when the servo drive is disabled |
| Typical Brake Voltage | 24 V DC Reference |
| Suitable Use | Position holding during stop or power-off conditions |
| Important Limitation | Not intended for repeated dynamic service braking |
| Application Check | Required for vertical axes and suspended-load mechanisms |
For vertical axes, lifting units, or safety-related movement, the brake must be reviewed as part of the complete machine safety design. The machine builder should check load torque, brake timing, drive control sequence, emergency stop logic, and mechanical risk requirements before relying on the motor brake for holding.
Design Characteristics
The R911316378 MSK050B-0300-NN-S1-UP1-NNNN is useful where the machine requires precise servo control in a small mechanical envelope. Its compact frame makes it suitable for machines where available space is limited, while the brake-equipped shaft configuration helps support controlled stopping and holding requirements.
| Design Feature | Practical Benefit |
|---|---|
| Compact MSK050B Frame | Suitable for small machines and limited installation spaces |
| 0300 Winding | Balanced torque and speed behavior for compact servo axes |
| Natural Convection Cooling | Simplifies installation without external cooling hardware |
| S1 Encoder Feedback | Supports precise singleturn position and speed control |
| Shaft With Keyway | Helps provide positive mechanical torque transmission |
| Shaft Sealing Ring | Improves shaft-side protection in industrial environments |
| Holding Brake 1 | Helps hold the axis when the drive is disabled |
| IP65 Protection | Supports machine-mounted use under correct installation conditions |
Typical Application Areas
This motor can be used in compact motion-control systems where a small servo motor must still provide reliable torque, accurate feedback, and industrial durability. It is suitable for replacement projects and new machine designs when the drive, cable, encoder, and mechanical interface match.
| Industry | Typical Application |
|---|---|
| Packaging Machinery | Labeling axis, small feed axis, sealing adjustment mechanism |
| Assembly Automation | Indexing unit, fixture movement, small servo press |
| Electronics Manufacturing | Feeder drive, component positioning, precision transfer module |
| Printing Equipment | Small roller drive, material feed adjustment, registration control |
| Handling Systems | Pick-and-place module, small rotary axis, transfer unit |
| Textile Machinery | Thread feed, winding adjustment, compact synchronized axis |
| Laboratory Equipment | Test stand movement, compact actuator positioning |
| General Automation | Small servo axis replacement and retrofit projects |
Replacement and Compatibility Notes
When replacing this motor, the order number R911316378 and full model code MSK050B-0300-NN-S1-UP1-NNNN should be verified against the original motor nameplate. Similar MSK050B motors may not be direct replacements if the encoder, brake, shaft, or additional configuration code is different.
| Compatibility Check | Reason |
|---|---|
| Order Number R911316378 | Confirms the exact Rexroth material reference |
| Full Type Code | Prevents encoder, brake, shaft, or configuration mismatch |
| Encoder Type | S1 feedback must match the drive feedback interface |
| Brake Configuration | UP1 includes holding brake 1 |
| Shaft Type | Keyway shaft must match the coupling or transmission part |
| Shaft Seal | Must match the machine-side sealing requirement |
| Cooling Method | NN natural convection must match thermal conditions |
| Cable Set | Power, feedback, and brake cables must be compatible |
| Drive Controller | Motor data and encoder parameters must match the servo drive |
Procurement and Inspection Guidance
For procurement, the buyer should specify both the order number and the full model code. If the motor is purchased as used or refurbished stock, the supplier should confirm the nameplate, encoder feedback, holding brake function, shaft condition, connector condition, bearing condition, insulation test result, and packing method before shipment.
| Inspection Item | Recommended Check |
|---|---|
| Nameplate | Confirm R911316378 and MSK050B-0300-NN-S1-UP1-NNNN |
| Encoder | Verify S1 feedback function and connector condition |
| Holding Brake | Test brake release and holding function |
| Shaft and Keyway | Check for wear, rust, deformation, or impact marks |
| Bearings | Check smooth rotation, abnormal noise, and mechanical play |
| Insulation | Perform insulation resistance testing before installation |
| Connectors | Inspect pins, seals, threads, and cable interface |
| Housing | Check for cracks, dents, corrosion, or signs of improper repair |
| Packaging | Protect shaft, feedback connector, brake wiring, and power connector |
SEO-Oriented Product Summary
The REXROTH R911316378 MSK050B-0300-NN-S1-UP1-NNNN synchronous servo motor is a compact IndraDyn S motor for precision industrial automation and motion-control systems. It features an MSK050B frame, 0300 winding, natural convection cooling, S1 encoder configuration, shaft with keyway, shaft sealing ring, holding brake 1, IP65 protection, and an approximate net product weight of 4.9 kg. With 3.4 Nm continuous standstill torque at 100 K, 9.0 Nm maximum torque, and 4300 rpm maximum speed, this motor is suitable for packaging machinery, assembly automation, electronics manufacturing, printing equipment, compact handling systems, textile machinery, laboratory equipment, and small servo-driven machine axes. For accurate replacement and purchasing, buyers should confirm both the Rexroth order number R911316378 and the complete model code MSK050B-0300-NN-S1-UP1-NNNN before ordering.
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