SEW BW012-050 Detailed Product Description

SEW BW012-050 is a brake resistor (braking resistor) of the BW series under the SEW brand. It is specifically designed for use in variable frequency drives and servo drives during deceleration and braking, providing an energy dissipation circuit to convert regenerated electrical energy into heat, stabilizing the DC bus voltage, protecting power components, and is suitable for medium-power servo/variable frequency systems.

1. Basic Information

Product Series: BW Series Brake Resistor (Brake Resistor)

Full Model: BW012-050

Product Type: Wound-rotor Brake Resistor (Aluminum Shell / Cement Encapsulation)

Manufacturer: SEW-EURODRIVE (Germany)

Applicable Equipment: SEW Variable Frequency Drives, BTS/BFS Series Servo Drives

Application Scenarios: Rapid motor braking, frequent forward and reverse rotations, lowering of potential energy loads, protection of DC bus overvoltage

Installation Method: Wall-mounted / Rail-mounted, independent heat dissipation

Protection Grade: IP20 (standard) / IP54 (optional - T-type)

2. Model Meaning Interpretation

BW: Brake Resistor (Brake Resistor) Series

012: Resistance Power Rating 1200W (1.2kW)

050: Nominal Resistance Value 50Ω (Ohm)

3. Core Technical Parameters

1. Electrical Parameters

Rated Power (PR): 1200W (Continuous)

Peak Power (PP): ≥ 6kW (Short Time, 10s)

Nominal Resistance (R): 50Ω ± 5%

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

Insulation Class: F Grade (155℃)

Temperature Coefficient: ≤ ±100ppm/℃ (Low Drift)

Maximum Allowable Temperature Rise: 375℃ (Resistance Wire)

Shell Temperature: ≤ 120℃ (Safe Contact)

2. Physical Parameters

Encapsulation Form: Aluminum Shell Waveform Heat Dissipation (BW012-050) / Cement Encapsulation (BW012-050-T)

Size (W×H×D): Approximately 100×160×80mm

Weight: Approximately 1.8kg

Installation Hole Spacing: 120mm

Connection Terminals: 2×M6 Screw Terminals

3. Functional Characteristics

Braking Characteristics: Rapid Energy Dissipation, Response < 1ms

Protection Function: Built-in Temperature Switch (Normally Closed 85℃), Overheating Cut-off, Linked Drive Alarm

Stability: Non-inductive Winding, Low Inductance, Low EMI

Life: 10,000 Hours (Full Load)

Environment: -25℃ ~ +45℃, Humidity 5–95% (No Condensation)

4. Functions and Advantages

1. High-Efficiency Braking

1.2kW/50Ω: Compatible with 2.2–5.5kW Servo/Variable Frequency Systems

Peak 6kW: Satisfies Frequent Braking, Large Inertia Load

Non-inductive Design: Does Not Interfere with Servo Control, Precise Positioning

2. Safe and Reliable

Temperature Protection: Built-in 85℃ Temperature Switch, Anti-Overheating Burnout

High Insulation: 800V Voltage Rating, F Grade Insulation, Safe and Stable

Industrial Grade: Anti-Vibration, Corrosion Resistance, Adaptation to Harsh Working Conditions

3. Strong Compatibility

SEW Original: Directly Match BTS20, Movidrive, MOVITRAC, etc. Series

Voltage Compatibility: 300V/600V DC Bus Universal

Installation Flexible: Wall-mounted / Rail-mounted, Vertical Installation, Forced Air Cooling Optimization

4. Maintenance Simple

No Maintenance: Solid State Resistor, No Aging, No Consumables

Status Monitoring: Temperature Switch Output, Can Be Connected to PLC Monitoring

Replacement Convenient: Standard Size, Direct Replacement with the Same Specification Resistor

5. Typical Applications

Applicable Power: 2.2–5.5kW Variable Frequency Drives / Servo Drives System configuration: Drive + BW012-050 + servo / variable frequency motor

Typical operating conditions:

Fast braking of the machine tool spindle and servo axis

Lowering of the crane and lifting platform under potential load

Frequent start-stop and forward/reverse operation of packaging and printing equipment

Emergency stop protection of the conveyor belt and centrifuge

VI. Selection and installation tips

Power matching: Braking power ≤ 1.2kW (continuous)

Resistance matching: Recommended for the driver's braking unit 50Ω

Voltage matching: DC bus ≤ 600V DC

Heat dissipation: Vertical installation, spacing ≥ 50mm, forced air cooling is better

Wiring: Short, thick, straight wiring, reducing voltage drop and interference

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

VII. Order information

Model: BW012-050 (aluminum case)

Variant: BW012-050-T (cement packaging, IP54)

Guarantee: 12 months

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

VIII. Comparison of the same series

BW012-025: 1.2kW / 25Ω (small resistance, large current)

BW012-050: 1.2kW / 50Ω (current)

BW012-100: 1.2kW / 100Ω (large resistance, small current)

BW015-042: 1.5kW / 42Ω (higher power)