High Voltage Soft Start Resistor for Safe Inverter Startup
Description
Product Overview
The high voltage soft start resistors is a vital component for managing inrush current during inverter and power supply startup. By gradually charging capacitors, it helps reduce electrical stress and protects sensitive components from sudden surges. As a result, overall system stability improves, and the lifespan of key devices is extended. Moreover, the resistor’s non-inductive construction makes it highly suitable for high-speed switching and pulse load applications in industrial systems.
Product size table
| Type | Rated Power (W) | Structural Type | Lmax (mm) | Dmax (mm) | L1 (mm) | d (mm) | Resistance Range (Ω) | Max Operating Voltage (KV) | Temp. Coefficient (ppm/℃) | Operating Temp (℃) | Resistance Tolerance (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RI80 | 3 | A | 24±2 | 8±1 | 30±3 | 1±0.1 | 100~2G | 5 | ≤±200 | -55℃~+70℃ | F/G/J/K |
| RI80 | 5 | A/B | 51±2 | 8±1 | 30±3 | 1±0.1 | 100~2G | 10 | ≤±200 | -55℃~+70℃ | F/G/J/K |
| RI80 | 10 | A/B | 72±2 | 12±1 | 30±3 | 1±0.1 | 100~2G | 15 | ≤±200 | -55℃~+70℃ | F/G/J/K |
| RI80 | 20 | A/B | 102±2 | 12±1 | 30±3 | 1±0.1 | 100~200M | 20 | ≤±400 | -55℃~+70℃ | F/G/J/K |
| RI80 | 25 | A/B | 127±2 | 12±1 | 30±3 | 1±0.1 | 100~200M | 30 | ≤±400 | -55℃~+70℃ | F/G/J/K |
| RI80 | 30 | A/B | 152±2 | 12±1 | 30±3 | 1±0.1 | 100~200M | 40 | ≤±400 | -55℃~+70℃ | F/G/J/K |
| RI80 | 50 | B/C | 120±2 | 22±1 | 10±1 | M6 | 100~200M | 50 | ≤±400 | -55℃~+70℃ | F/G/J/K |
| RI80 | 75 | B/C | 130±2 | 27±1 | 10±1 | M6 | 100~200M | 70 | ≤±400 | -55℃~+70℃ | F/G/J/K |
| RI80 | 100 | B/C | 170±2 | 27±1 | 10±1 | M6 | 100~100M | 100 | ≤±400 | -55℃~+70℃ | F/G/J/K |
| RI80 | 200 | B/C | 260±2 | 27±1 | 10±1 | M5/M6 | 100~100M | 100 | ≤±400 | -55℃~+70℃ | F/G/J/K |
| RI80 | 300 | B/C | 310±2 | 27±1 | 10±1 | M5/M6 | 100~100M | 100 | ≤±400 | -55℃~+70℃ | F/G/J/K |
| RI80 | 500 | B/C | 310±2 | 53±1 | 10±1 | M8 | 100~100M | 100 | ≤±400 | -55℃~+70℃ | F/G/J/K |
Why Use High Voltage Soft Start Resistors?
Inrush Current Control for Safer Startups
During initial power-on, inverters, converters, and IGBTs can experience high inrush current. High voltage soft start resistors manage this current by gradually charging input capacitors, protecting sensitive components, reducing startup stress, and minimizing noise.
For engineers seeking more details on safe inrush current management and soft start techniques, refer to the official IEC guideline on Power Electronics Safety
Electrical Characteristics
| Parameter | Value |
|---|---|
| Resistance Range | 100Ω – 2000MΩ |
| Rated Voltage | 5kV – 100kV |
| Power Rating | 3W – 500W |
| TCR | ±100ppm/°C (typical) |
| Tolerance | ±1%、±3%、±5%、±10% |
| Construction | Thick Film, Glass Glaze |
| Mounting | Axial / Screw Terminal |
Applications Across Industries
-
Inverter and VFD pre-charge circuits
-
High-voltage DC power supply startup
-
Capacitor charging and discharging modules
-
Pulse power equipment
-
Medical X-ray and CT systems
-
Industrial automation systems
Furthermore, their compact size and customizable specifications make them easy to integrate into control panels, test equipment, and high-energy discharge systems.
Looking for general-purpose HV resistors? Explore our high voltage thick film resistor series
