Detailed Product Description of SEW BW018-035

SEW BW018-035 is a high-power braking resistor of the SEW BW series, specially designed for 11–22kW servo/variable frequency systems. It is used to quickly discharge the regenerated electrical energy of the motor, stabilize the DC bus voltage, and protect the power devices of the driver. It is suitable for high inertia, frequent braking, and potential energy load conditions. 

I. Basic Information

Product Series: BW Series Brake Resistor (Brake Resistor)

Full Model: BW018-035

Variant Model: BW018-035-T (Metal Mesh Cover, IP54 Protection)

Product Type: High-power Wire-Wound Brake Resistor, Aluminum Shell / Waveform Heat Dissipation, With Temperature Control Protection

Manufacturer: SEW-EURODRIVE (Germany)

Compatible Equipment: SEW MOVIDRIVE, BTS20, MDX61/60 Series Drives

Application Scenarios: Rapid Braking, Frequent Start/Stop, Potential Load (Crane, Hoist Platform), Large Inertia Equipment

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

Cooling Method: Natural Cooling (Optional Forced Air Cooling)

II. Model Meaning Explanation

BW: Brake Resistor (Brake Resistor) Series

018: Rated Power 3.5kW (3500W)

035: Nominal Resistance 18Ω (Ohm)

III. Core Technical Parameters

1. Electrical Parameters

Rated Power (PR): 3500W (Continuous)

Peak Power (PP): ≥ 14kW (Short Time, 10s)

Nominal Resistance (R): 18Ω ± 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℃ (Wire Resistance)

Shell Temperature: ≤ 120℃ (Safe Contact)

2. Physical Parameters

Package: Aluminum Shell Waveform Heat Dissipation (BW018-035) / Metal Mesh Cover (BW018-035-T)

Size (W×H×D): Approximately 300×400×150mm

Weight: 8.46kg

Installation Method: Wall-mounted, Vertical Installation

Connection Terminals: 2×M8 Screw Terminals

3. Environmental Characteristics

Operating Temperature: -25℃ ~ +45℃

Humidity: 5–95% (No Condensation)

Vibration Resistance: Industrial Grade, Compatible with Machine Tools, Lifting Equipment

Life: 10,000 Hours (Full Load)

IV. Function and Advantages

1. High Power Braking Capacity

3.5kW/18Ω: Compatible with 11–22kW Servo / Variable Frequency Systems

Peak 14kW: Satisfies High Inertia, Frequent Braking, Heavy Load Lowering

Low Inductance Design: Does Not Interfere with Servo Control, Precise Positioning

2. Safe and Reliable

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

Industrial Grade Material: High Temperature Wire Resistance, Corrosion-resistant Shell

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

3. Strong Compatibility

SEW Original: Directly Matched with MOVIDRIVE, BTS20, MDX60 Series

Voltage Compatibility: 300V/600V DC Bus Universal

Installation Flexibility: Vertical Installation, Forced Air Cooling Optimization, Multiple Units Parallel Expansion

4. Maintenance Convenient

Status Monitoring: Temperature Switch Connected to Drive BRK Terminal

Replacement Convenient: Standard Size, Direct Replacement with Same Specification Resistors

No Maintenance Required: No Consumables, Long-Term Stable Operation

V. Typical Applications

Compatible Power: 11–22kW Variable Frequency / Servo Drives

System Configuration: Drive + BW018-035 + Servo / Variable Frequency Motor

Typical Conditions:

Machine Spindle,龙门铣， Large Servo Axis Braking

Crane， Lifting Platform， Palletizing Garage Potential Load

Centrifuge， Fan， Pump Type Large Inertia Equipment Emergency Stop

Packaging， Printing， Textile Equipment Frequent Start/Stop， Forward/Reverse Rotation

VI. Selection and Installation Tips

Power Matching： Braking Power ≤ 3.5kW (Continuous) Resistance matching: The driver braking unit is recommended at 18Ω

Voltage matching: DC bus ≤ 600V DC

Heat dissipation: Vertical installation, spacing ≥ 100mm, forced air cooling is preferred

Wiring: Short, thick, straight wiring (≥ 6mm² cable), reduces voltage drop and interference

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

VII. Order Information

Model: BW018-035 (aluminum case, IP20)

Variant: BW018-035-T (net cover, IP54)

Order number: 18201385

Guarantee: 12 months

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

VIII. Comparison with the same series

BW012-050: 1.2kW / 50Ω (suitable for 2.2–5.5kW)

BW018-035: 3.5kW / 18Ω (current) (suitable for 11–22kW)

BW018-075: 3.5kW / 7.5Ω (high current, low resistance)

BW027-012: 5.5kW / 12Ω (higher power)