Detailed Product Description of SEW BW047-004
 SEW BW047-004 is a micro braking resistor from the SEW BW series, specifically designed for 0.37–0.75kW small-power servo/variable frequency systems. It is used for precise braking and energy dissipation of equipment with light load, low speed, and small inertia, and is suitable for compact electronic control cabinets and distributed drive scenarios.

I. Basic Information

Product Series: BW Series Brake Resistor (Brake Resistor)

Full Model: BW047-004

Variant Model: BW047-004-T (Metal Mesh Cover, IP54 Protection)

Product Type: Wound-Resistor, Aluminum Shell Wave Heat Dissipation, Built-in Temperature Control Protection

Manufacturer: SEW-EURODRIVE (Germany)

Compatible Drives: SEW MOVITRAC, MOVIDRIVE B, MDX60/61, MC07B Mini Series

Application Scenarios: Micro-device Braking, Light Load Emergency Stop, Small Inertia Positioning, Distributed Servo System

Protection Grade: IP20 (Standard) / IP54 (-T Type)

Cooling Method: Natural Cooling (No Forced Air Cooling Required)

II. Model Meaning Explanation

BW: Brake Resistor (Brake Resistor) Series

047: Nominal Resistance Value 47Ω (Ohm)

004: Rated Power 0.4kW (400W)

III. Core Technical Parameters

1. Electrical Parameters

Rated Power (PR): 0.4kW (Continuous, 100% ED)

Peak Power (PP): 4kW (Short Time, 10s, 10% ED)

Nominal Resistance (R): 47Ω ±5%

Voltage Rating: 800V DC (Compatible with 300–600V DC Bus)

Insulation Class: F Grade (155℃)

Temperature Switch: Built-in Normally Closed 85℃ Temperature Control, Overheating Cut-off, Linked Drive Alarm

Maximum Temperature Rise: 375℃ (Resistance Wire)

Shell Temperature: ≤120℃ (Safe Contact)

2. Physical Parameters

Package: Aluminum Shell Wave Heat Dissipation (BW047-004) / Metal Mesh Cover (BW047-004-T)

Size (W×H×D): Approximately 150×100×60mm (Compact)

Weight: Approximately 1.92kg

Installation Method: Wall-mounted, Vertical Installation

Connection Terminals: 2×M4 Screw Terminals

3. Environmental Characteristics

Operating Temperature: -25℃ ~ +45℃

Humidity: 5–95% (No Condensation)

Vibration Resistance: Industrial Grade, Compatible with Machine Tools, Robot End, Conveyor Line

Life: 10,000 Hours (Full Load)

IV. Function and Advantages

1. Micro Precision Braking

0.4kW/47Ω: Precisely Match 0.37–0.75kW Micro Drive System

Peak 4kW: Satisfy Small Inertia, Light Load, Low Speed Equipment's Rapid Braking

Low Inductance Design: Does Not Interfere with Servo Control, High Positioning Accuracy, No Electromagnetic Interference

2. Safe and Reliable

Dual Protection: 85℃ Temperature Switch + High Insulation Voltage Rating

Industrial Grade Material: High Temperature Resistance Wire, Corrosion Resistant Aluminum Shell

Long Life: Solid State Resistance, No Aging, No Maintenance Required

3. Compact Design

Small Size, Light Weight: Compatible with Micro Electrical Control Cabinets, Distributed Installation

Flexible Installation: Vertical Installation, Spacing ≥ 30mm, No Forced Air Cooling Required

Connection Simple: M4 Terminals, 2.5mm² Cable Sufficient for Current Carriage

4. Compatibility

SEW Original: Directly Match MOVITRAC, MC07B, MDX60 Micro Series

Voltage Compatibility: 300V/600V DC Bus Universal

Multiple Parallel Connections: Can be Parallel Expanded to Meet Higher Braking Requirements

V. Typical Applications

Compatible Power: 0.37–0.75kW Frequency Converter / Servo Drive

System Configuration: Micro Drive + BW047-004 + Micro Servo / Frequency Motor

Typical Working Conditions:

Robot End Effector, Small Rotating Table

Micro Conveyor Line, Light Load Elevator, Packaging Machinery

Medical Equipment, Precision Instruments, Small Machine Spindle Electronic manufacturing equipment, 3C automation, small inertia positioning system

VI. Selection and Installation Tips

Power matching: Braking power ≤ 0.4kW (continuous)

Resistance matching: Micro driver braking unit recommended 47Ω

Voltage matching: DC bus ≤ 600V DC

Heat dissipation: Vertical installation, spacing ≥ 30mm, natural cooling is sufficient

Wiring: Short, thick, straight wiring (≥ 2.5mm² cable), reduce interference

Protection: Temperature control switch connected to driver BRK terminal to achieve overheat protection

VII. Order Information

Model: BW047-004 (aluminum case, IP20)

Variant: BW047-004-T (net cover, IP54)

Order number: 8220808

Guarantee: 12 months

Standard equipment: Resistor body, installation screws, temperature control switch wire

VIII. Comparison of Micro Resistors in the Same Series

BW027-006: 0.6kW / 27Ω (suitable for 0.75–1.5kW)

BW047-004: 0.4kW / 47Ω (current) (suitable for 0.37–0.75kW)

BW033-012: 1.2kW / 33Ω (suitable for 2.2–5.5kW)

BW039-012: 1.2kW / 39Ω (suitable for 2.2–5.5kW)