Aluminum Housed Startup Protection Resistor
Description
Overview
A startup protection resistor, also known as a precharge resistor or inrush current limiting resistor, is designed to control initial current surge during power-up conditions and protect sensitive components in electrical systems.
Our aluminum housed startup protection resistors provide excellent heat dissipation, stable thermal performance, and reliable energy absorption for inverter systems, motor drives, DC power supplies, and industrial electronics. Custom resistance values and power ratings are available to meet different application requirements.
🔧 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 
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 |
Applications of Startup Protection Resistors
- Inverter and motor drive systems
Limits inrush current during startup and protects power components. - Servo systems and motion control equipment
Ensures stable operation during repeated power cycles. - HVAC and industrial control panels
Helps protect capacitors and electronic components during energizing. - DC power supplies and energy storage systems
Supports safe precharge and capacitor charging processes.
Why Choose Our Aluminum Housed Startup Protection Resistor?
- Custom resistance values and power ratings available
- Aluminum housing for efficient heat dissipation
- Stable performance during repeated startup cycles
- Flexible lead length and mounting options
Related Products
Explore our Aluminum Housed Inrush Current Resistors for additional solutions in inverter startup protection, precharge circuits, and industrial power systems.
FAQ
What is a startup protection resistor?
A startup protection resistor limits the initial current surge when a system is powered on. It protects capacitors, inverters, and other sensitive components from excessive inrush current.
Is a startup protection resistor the same as a precharge resistor?
Yes. In many DC power systems and inverter applications, startup protection resistors are used as precharge resistors to control capacitor charging current during startup.
Can the resistance value and power rating be customized?
Yes. We can provide customized resistance values, power ratings, lead lengths, and mounting options according to your application requirements.
