SEW BW072-003 Detailed Product Description
SEW BW072-003 is a high-resistance ultra-miniature braking resistor of the SEW BW series, specially designed for 0.18–0.25kW small-power servo/variable frequency systems, used for precise braking and energy dissipation in micro-inertia, light-load, and low-speed equipment, suitable for compact electronic control cabinets and embedded micro-drive scenarios.

I. Basic Information

Product Series: BW Series Brake Resistor (Brake Resistor)

Full Model: BW072-003

Variant Model: BW072-003-T (Metal Mesh Cover, IP54 Protection)

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

Manufacturer: SEW-EURODRIVE (Germany)

Driver Compatibility: SEW MOVITRAC, MC07B, MOVIDRIVE B Micro Series

Application Scenarios: Ultra-miniature equipment braking, light-load emergency stop, micro-inertia positioning, embedded micro servo systems

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

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

Product Status: Discontinued (DISCONTINUED)

II. Model Meaning Interpretation

BW: Brake Resistor (Brake Resistor) Series

072: Nominal Resistance 72Ω (Ohm)

003: Rated Power 0.3kW (300W/250W)

III. Core Technical Parameters

1. Electrical Parameters

Rated Power (PR): 0.25–0.3kW (Continuous, 100% ED)

Peak Power (PP): 3kW (Short Time, 10s, 10% ED)

Nominal Resistance (R): 72Ω ±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 Driver Alarm

Maximum Temperature Rise: 375℃ (Resistance Wire)

Shell Temperature: ≤120℃ (Safe Contact)

2. Physical Parameters

Package: Aluminum Shell Wave Heat Dissipation (BW072-003) / Metal Mesh Cover (BW072-003-T)

Size (W×H×D): Approximately 110×80×15mm (Ultra-Miniature)

Weight: Approximately 0.3kg

Installation Method: Wall-mounted, Vertical Installation

Connection Terminals: 2×M3 Screw Terminals

3. Environmental Characteristics

Operating Temperature: -25℃ ~ +45℃

Humidity: 5–95% (No Condensation)

Vibration Resistance: Industrial Grade, Compatible with Precision Instruments, Micro-Small Automation Equipment

Life: 10,000 Hours (Full Load)

IV. Functions and Advantages

1. Ultra-High Resistance Micro-Power Braking

0.3kW/72Ω: Precisely Match 0.18–0.25kW Small-Power Drive Systems

Ultra-High Resistance Feature: Compatible with Low Bus Voltage, Micro Current Braking Scenarios

Peak 3kW: Satisfy Micro-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. Ultra-Miniature Design

Extremely Small Size, Extremely Light Weight: Compatible with Ultra-Miniature Electronic Control Cabinets, Embedded Installation

Flexible Installation: Vertical Installation, Spacing ≥ 20mm, No Forced Air Cooling Required

Connection Simple: M3 Terminals, 1.5mm² Cable Sufficient for Current Carriage

4. Strong Compatibility SEW Original: Directly compatible with MOVITRAC, MC07B, and MOVIDRIVE B mini series

Voltage compatibility: 300V/600V DC bus is universal

Multiple parallel connections: Can be connected in parallel for expansion to meet higher braking requirements

VII. Typical Applications

Applicable power: 0.18–0.25kW frequency converter / servo drive

System configuration: Ultra-miniature driver + BW072-003 + micro servo / frequency motor

Typical working conditions:

Precision instruments, medical equipment, small rotating tables

Micro-sized conveying lines, light-load lifting tables, electronic manufacturing equipment

3C automation, micro-inertia positioning systems, robot end effectors

Small packaging machinery, laboratory equipment, micro-pump valve control

VI. Selection and Installation Tips

Power matching: Braking power ≤ 0.3kW (continuous)

Resistance matching: The recommended braking unit for the mini driver is 72Ω

Voltage matching: DC bus ≤ 600V DC

Heat dissipation: Vertical installation, spacing ≥ 20mm, natural cooling is sufficient

Cabling: Short, thick, straight wiring (≥ 1.5mm² cable), reduces interference

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

VII. Order Information

Model: BW072-003 (aluminum case, IP20)

Variant: BW072-003-T (net cover, IP54)

Order number: 8260583 / 8022658

Guarantee: 12 months

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

VIII. Comparison of Mini Resistors in the Same Series

BW068-004: 0.4kW / 68Ω (compatible with 0.25–0.37kW)

BW072-003: 0.3kW / 72Ω (current) (compatible with 0.18–0.25kW)

BW047-004: 0.4kW / 47Ω (compatible with 0.37–0.75kW)

BW027-006: 0.6kW / 27Ω (compatible with 0.75–1.5kW)