300W 50 Ω Aluminum Type Inverter startup protection resistor
Description
300W 50 Ω Aluminum Type Inverter startup protection resistor
This 300W 50Ω aluminum-housed resistor is designed to protect inverter and motor drive systems during startup by effectively limiting inrush current. Its robust structure, excellent heat dissipation, and high overload capacity make it ideal for industrial applications where reliability and safety are critical.
🔧 Features
- Rated power: 300W, resistance: 50Ω
- Limits inrush current during inverter startup
- Aluminum housing for efficient heat dissipation
- High overload capacity and stable performance
- Flame-retardant and RoHS compliant
- Custom resistance and size available
Aluminum resistor used in inverter startup circuits
Dimension
| Model | rated power (KW) |
L | W | H | L×W D1×W1 Pin pitch |
Mounting opening | Lead wire (mm) (Optional cable length) |
| RXLG | 1.2 | 250 | 150 | G | 236×70 | 8 | 500 |
| 1.5 | 280 | 150 | 61 | 266×70 | 8 | 500 | |
| 2 | 310 | 150 | 61 | 296×70 | 8 | 500 | |
| 2.5 | 350 | 150 | 336×70 | 8 | 500 | ||
| 3 | 400 | 150 | 61 | 386×70 | 8 | 500 | |
| 4 | 380 | 150 | 61 | 366×70 | 8 | 500 | |
| 4.5 | 410 | 150 | 61 | 396×70 | 8 | 500 | |
| 5 | 460 | 150 | 61 | 446×70 | 8 | 500 | |
| 5.5 | 500 | 150 | 61 | 486×70 | 8 | 500 | |
| 6 | 550 | 150 | 61 | 536×70 | 8 | 500 |
VFD Power vs. Braking Resistor Power Selection Table (General Reference)
| VFD Power (kW) | Recommended Resistor Power (W) | Recommended Resistance (Ω) | Notes |
|---|---|---|---|
| 0.75 kW | 100–200 W | 100–150 Ω | Light-duty, fans |
| 1.5 kW | 200–400 W | 75–100 Ω | – |
| 2.2 kW | 300–600 W | 60–80 Ω | Standard braking |
| 3.7 kW | 600–800 W | 40–60 Ω | – |
| 5.5 kW | 800–1000 W | 30–50 Ω | Common industrial use |
| 7.5 kW | 1.0–1.5 kW | 20–40 Ω | – |
| 11 kW | 1.5–2.0 kW | 15–25 Ω | – |
| 15 kW | 2.0–3.0 kW | 10–20 Ω | – |
| 18.5 kW | 3.0–4.0 kW | 8–15 Ω | Heavy-duty applications |
| 22–30 kW | 4.0–6.0 kW | 6–10 Ω | Large equipment |
| 37–45 kW | 6.0–8.0 kW | 4–8 Ω | Cranes, hoists |
| ≥55 kW | ≥10 kW | 2–5 Ω | May use multiple resistors in parallel |
Application
This inverter startup protection resistor is ideal for use in:
-
Motor drives and servo systems
-
Industrial automation equipment
-
Elevators and HVAC systems
-
Power supplies and UPS units
Whether you’re designing a system that needs consistent startup protection or upgrading existing equipment, this high-power aluminum resistor provides a reliable and customizable solution. Resistance values, power ratings, and mounting options can all be tailored to your needs.
Why do I need an inrush current protection resistor?
Without one, sudden surges at startup can damage inverters, blow fuses, or cause long-term stress to power electronics. Our 300W aluminum resistor helps prevent such issues reliably.
