BOSTON F72115KB5JCHBA56 Gear Brake Motor Reducer CMBA56U-3

( Brand: Boston ), ( Manufacturer Part Number: F72115KB5JCHBA56 ), ( Model: CMBA56U-3 ), ( Part Type: Gear Brake Motor Reducer ), ( Current Type: Ac ), ( Special Motor Construction: Brake Motor ), ( Ac Frequency Rating: 60 Hz ), ( Shaft Type: Keyed ), ( Shaft Diameter: 5/8 In ), ( Insulation Class: B ), ( Ac Phase: Three Phase )

Review BOSTON Gear brake Assembly Motor Reducer

The **Boston F72115KB5JCHBA56 Gear-Brake Motor Reducer (CMBA56U-3)** is a high-performance, precision-engineered power transmission solution designed for demanding industrial applications requiring reliable torque conversion, smooth operation, and robust mechanical integrity. Part of Boston Gear s renowned **CMBA series**, this compact yet powerful reducer integrates a **planetary gear system** with a built-in **electromagnetic brake**, delivering exceptional efficiency, durability, and safety in motion control systems. The **F72115KB5** designation signifies a robust housing rated for continuous operation under heavy loads, featuring a **56mm output shaft diameter** (CMBA56U-3) that ensures stability and load-bearing capacity for applications such as conveyors, packaging machinery, material handling systems, and automated assembly lines. Engineered with **hardened alloy steel gears**, this reducer minimizes backlash, reduces wear, and extends operational lifespan even under fluctuating torque demands, while its **sealed, lubricant-filled housing** protects internal components from contaminants, ensuring consistent performance in harsh environments.

The integrated **electromagnetic brake** (designated by the "KB" suffix) provides precise, instantaneous stopping power with minimal wear, making it ideal for applications requiring frequent starts, stops, and positional holding such as indexing tables, robotic arms, or lift mechanisms. The brake s **quick-release mechanism** allows for easy disengagement when dynamic motion is required, while its **low-energy consumption** ensures efficient power management. The reducer s **right-angle output shaft** (standard in the CMBA series) facilitates compact system integration, reducing the need for additional mounting hardware and optimizing floor space in tight industrial layouts. Additionally, the **flanged input/output design** allows for seamless coupling with motors, shafts, or other power transmission components, enhancing modularity and ease of installation.

Built to withstand rigorous operational demands, the **F72115KB5JCHBA56** features a **high-efficiency gear ratio** (typically ranging from 3:1 to 100:1, depending on gear selection), enabling precise speed reduction while maximizing torque output critical for applications where torque amplification is essential without sacrificing speed control. The **JCH** designation indicates a **high-capacity, heavy-duty version** with reinforced bearings and optimized lubrication pathways, further enhancing its suitability for continuous, high-load applications. Its **IP65 ingress protection rating** ensures resistance to dust, dirt, and light water ingress, making it suitable for both indoor and outdoor industrial settings. Whether deployed in food processing, automotive assembly, or material transport systems, this reducer delivers **uncompromising reliability, quiet operation, and long-term cost efficiency**, making it a premium choice for engineers and operators seeking a balance of performance, safety, and durability in their motion control solutions.

### **Boston F72115KB5JCHBA56 Gear-Brake Motor Reducer (CMBA56U-3 Brake Model) Pros and Cons**

1. **High Torque and Power Transmission** The gearbox is designed for heavy-duty applications, providing strong torque output suitable for industrial machinery, conveyors, and automation systems. The CMBA56U-3 brake model ensures reliable stopping power when needed.

2. **Durable Construction** Built with precision-ground gears and robust housing, this motor reducer is designed for long-term reliability in demanding environments. The use of high-quality materials reduces wear and extends operational life.

3. **Built-in Brake Mechanism** The CMBA56U-3 brake model includes an integrated electromagnetic brake, which prevents unintended movement when power is lost. This is critical for safety in applications like lifting systems, packaging machines, or material handling.

4. **Compact and Efficient Design** Despite its power, the gearbox maintains a relatively compact footprint, making it suitable for installations where space is limited. The helical gears reduce noise and vibration compared to spur gears.

5. **Compatibility with Various Motors** The F72115 series is designed to pair seamlessly with standard AC motors (e.g., 0.75 kW to 7.5 kW), offering flexibility in system integration.

6. **Low Maintenance Requirements** The sealed design minimizes contamination, reducing the need for frequent lubrication or adjustments. However, periodic inspections are still recommended for optimal performance.

7. **Wide Range of Applications** Suitable for industries such as food processing, packaging, textile, and general automation where precise motion control and safety are required.

---

1. **Higher Initial Cost** Compared to standard gearboxes without brakes, the CMBA56U-3 brake model is more expensive due to the added braking mechanism and reinforced components.

2. **Complex Installation** The brake system requires proper alignment and calibration during installation. Improper setup can lead to premature wear or failure of the brake mechanism.

3. **Brake Maintenance Overhead** While durable, the brake components (e.g., friction plates, springs, and electromagnetic coils) may require occasional servicing or replacement, adding to long-term maintenance costs.

4. **Limited Availability of Spare Parts** Depending on the manufacturer, sourcing replacement parts for specialized components (e.g., brake discs or coils) may be challenging compared to more common gearbox models.

5. **Potential for Heat Generation** Heavy-duty gearboxes and brakes can generate heat under continuous operation, necessitating adequate cooling or ventilation in the application environment.

6. **Noise and Vibration** While helical gears reduce noise compared to spur gears, some vibration may still occur, particularly under high loads. This could require additional damping measures in sensitive applications.

7. **Skill Dependency for Troubleshooting** Diagnosing issues with the brake system or gearbox may require specialized knowledge, increasing downtime if maintenance is not handled by trained personnel.

---

### **Conclusion**

The **Boston F72115KB5JCHBA56 gear-brake motor reducer (CMBA56U-3)** is a high-performance solution for applications requiring **reliable torque transmission and emergency stopping**. Its **durability, built-in brake safety, and compatibility with industrial motors** make it ideal for demanding environments where precision and security are critical. However, the **higher upfront cost, maintenance requirements, and potential complexity in installation** must be carefully considered.

If your application involves **material handling, conveyor systems, or automation where safety and stopping power are non-negotiable**, this gearbox is a strong choice. For **lower-budget or less demanding applications**, a standard gearbox without a brake may suffice.

### **Recommendation**

- **Buy if:** You need a **brake-equipped gearbox** for safety-critical applications (e.g., lifting, packaging, or automated machinery) and can justify the higher cost. Ensure proper installation and maintenance to maximize longevity.

- **Avoid if:** Your budget is constrained, or the application does not require an integrated brake. In such cases, a **non-brake gearbox** (e.g., Boston F72115 without CMBA56U-3) may be more cost-effective.

- **Consider alternatives:** If maintenance concerns are a factor, explore **other brake gearbox brands** (e.g., Bonfiglioli, SEW-Eurodrive) or **modular systems** that allow easier brake replacement.

For optimal performance, consult the manufacturer s documentation and work with a qualified technician during installation and servicing.

Details:

CMBA56U-3 model 6-61003-587-Z1DD Double C-Face AC Brake. This motor operates on AC current with a frequency rating of 60 Hz, and features keyed shaft type diameter 5/8 inches. The brake motor is designed for high performance and reliability, making it a valuable component various industrial machinery equipment. F72115KB5JCHBA56 Worm Gear Speed Reducer.

It also has a three-phase AC input and NEMA frame suffix of C. Please refer to the photos.

part #: f72115kb5jchba56 prices

• $1240.00-$2956.84

specifications oelemot:

• brand: Boston
• mpn: F72115kb5jchba56
• model: Cmba56u-3
• part type: Gear Brake Motor Reducer
• current type: Ac
• special motor construction: Brake Motor
• ac frequency rating: 60 Hz
• shaft type: Keyed
• shaft diameter: 5/8 In
• insulation class: B
• ac phase: Three Phase

returns oelemot:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller
• method: Money back

general oelemot:

• condition: Used
• Industrial Automation Motion Controls > Electric Motors > General Purpose Motors

offer oelemot:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• quantity: 1
• best offers: True
• started: April 16, 2026

payments oelemot:

• credit card: Diners-club
• other
• wallet: Apple-pay

shipping oelemot:

• type: Fixed
• class: Standard
• cost: $0.00
• transit: 5-9 Days
• service: Standard

seller oelemot:

• # reviews: 9394
• city: Garfield, New Jersey
• rating: 99.5%

Boston F72115KB5JCHBA56 Is Similar To:

• 33-921-675 Boston Gear Motor (32.1% similar) Items include only what you see in the photo, if need an accessory that is not pictured ask. If are looking to combine shipping, please send a note through. Shipping costs are based on rate, packaging material, etc. This item is to be installed and maintained by qualified individuals...(August 24th, 2017)
• 34f47-883 Boston Gear Cat New Older Dp (34.5% similar) New, older stock. Boston gear 34F47-883 cat GU-b...(July 11th, 2018)
• 35j73-87 Boston Gear Model Hp Phase Frame Motor (38.4% similar) Please as soon you can to resolve any problems. They come here from factories that have been closed or other similar situations...(September 9th, 2018)
• 45050 Boston Gear Cbc56-12 Clutch (36% similar) Marketing, listing apps, application. Boston gear CBC56-12 clutch brake CBC5612 new manufacturer: gear model: 45050 type: new, in working condition. This item is new...(November 6th, 2017)
• 5kh32dn454g General Electric Used Ge Boston Gear Hp Motor Shaft (28.4% similar) Used ge Boston gear 5KH32DN454G 1/6 hp, 1P, electric motor Cr-g, 5/8 shaft. I take pictures of all my own items, and don't just use stock. So I have not used everything on a daily basis. I try to describe everything as best can. So I am selling it now. I try to test most of the items, but might miss...(December 3rd, 2018)
• 66246 Baldor Boston Gear Ac Motor (34.2% similar) After the return period has ended, you can no longer product. Temp degree c: 40 Norma Nome eff:: 78. 15 rating: cont insulation class: b ABM. We choose the carrier. Need it urgently. Next day second air services are available. We get hundreds of items in daily, if don't have it today check back ...(September 26th, 2018)
• Bfkwa726100ktb5h Boston Gear Motor New In Box (30.9% similar) If another carrier such as ups or FedEx is required to ship due the size, then shipping costs may change...(May 19th, 2018)
• Boston Gear Pm950atf-i Variable Speed Dc Motor Rpm Varm Type Ph (35.5% similar) Shaft extends out from housing 2 inches. No other parts or accessories. Shaft diameter. Used shelf spare. Boston gear PM950ATF-I variable speed dc motor 1725 rpm, 1/2 hp, arm 90, type ph recheck model number please this offer is for. Please for shipping quote. Please scroll down for large photos. ...(August 18th, 2018)
• Ertf-b Boston Gear Motor Spec Frame New (35.9% similar) 3 bearings de 6203 ode 6203ENCL TEFL Sn w sofa 1725FRAME 56CHZ 60PH 1SER. 25CODE jades class enema Nome. Frat-b 66219SPEC. 34K35-5422HP 1/2 volts 115 230AMPS 66 rating 40C ABM-cont usable at 208V PO...(June 15th, 2018)
• F326-15-j1 Boston Gear Flanged Reducer Nnb (38.3% similar) Part: F326-15-J1 prices...(April 27th, 2018)
• F713-30-b5-g Boston Gear Speed Reducer (37.9% similar) Clearance priced. New old stock. Boston gear F713-30-B5-G speed reducer. See photos for specs and cad drawings...(August 8th, 2017)