HF-KP43B 400W AC Servo Motor with Brake 18-Bit Encoder | Mitsubishi Electric

The Original New Mitsubishi Electric HF-KP43B is a 400 W (0.4 kW) low-inertia AC brushless rotary servo motor from the MELSERVO-J3 series, equipped with a built-in electromagnetic brake and an 18-bit absolute feedback encoder (262,144 ppr). Designed for small-capacity, high-precision applications, it operates at a rated speed of 3000 rpm with a maximum speed of 6000 rpm. The built-in spring-operated safety brake provides reliable holding and emergency stopping, making it ideal for vertical axis and belt-driven applications such as textile machinery and general industrial equipment. The motor features a straight shaft, 60×60 mm flange mounting, and IP65 protection. This product has been discontinued by Mitsubishi Electric (production ended May 2019) and is available as a spare part for maintaining existing MELSERVO-J3 installations.

Core Engineering Highlights:
400 W (0.4 kW) rated output | 2.7 A rated current / 8.1 A maximum | 1.3 N·m rated torque / 3.8 N·m maximum | 3000 rpm rated / 6000 rpm maximum speed | 18-bit absolute encoder (262,144 ppr) | Built-in electromagnetic brake (spring-operated safety brake) | 60×60 mm flange mounting | IP65 protection | 0°C to +40°C operating temperature | 2.1 kg weight

Key Features:

• Original New Mitsubishi Electric HF-KP43B servo motor

• 400 W (0.4 kW) rated output with 1.3 N·m rated torque

• Built-in 18-bit absolute feedback encoder (262,144 pulses/revolution) for precise position detection

• Built-in electromagnetic spring-operated safety brake (DC 24 V, static friction torque 1.3 N·m)

• Low-inertia, small-capacity design for high-frequency positioning

• Maximum speed 6000 rpm for high-speed positioning

• Straight shaft (without key) for direct coupling

• Natural cooling (self-cooled, fully enclosed)

• Recommended load inertia ratio: 22 times or less

• Moment of inertia: 0.5 kg·cm² (0.00005 kg·m²)

• Brake specifications: Rated voltage DC 24 V (+0%/-10%), power consumption 7.9 W at 20°C, release delay 0.03 s, engagement delay 0.02 s

• Brake life: 20,000 braking cycles (22 J per braking)

• Vibration level: V-10

• Maximum radial load: 245 N / Maximum axial load: 98 N

• Insulation class: Class B

• 60×60 mm flange mounting

• IP65 protection rating for dust and water jet resistance

Applications:

• Belt drive systems and textile machinery

• Vertical axis and gravity-loaded applications requiring holding brake

• Small-capacity machine tools and industrial equipment

• General industrial machinery requiring high-precision positioning

• Packaging machinery and material handling equipment

Technical Specifications:

System Compatibility:

• Compatible with Mitsubishi Electric MELSERVO-J3 series architecture. Drive model and firmware compatibility should be verified before installation.

• Verified compatible servo amplifiers: MR-J3-40A, MR-J3-40A1, MR-J3-40B, MR-J3-40B1, MR-J3-40T, MR-J3-40T1, MR-J3-40B-RJ006, MR-J3-40B1-RJ006

• For migration to MELSERVO-J4, the recommended replacement motor is HG-KR43B

Related Products:

• MR-J3-40B – 400 W servo amplifier, SSCNET III/H interface

• MR-J3-40A – 400 W servo amplifier, pulse train interface

• HG-KR43B – Recommended replacement servo motor (MELSERVO-J4 series, 400 W, 22-bit encoder)

• MR-BAT6V1SET – Battery for absolute encoder

• MR-J3ENCBL2M-A1-L – Encoder cable, 2 m (standard bending life)

• MR-PWS1CBL2M-A1 – Power cable, 2 m

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Mitsubishi Electric and MELSERVO are trademarks of Mitsubishi Electric Corporation.