80W 20Ω Cement Resistor for Soft Start & Surge Protection
Rated power range: 80W
Working voltage range: <1000V
Rated resistance range: 0.1Ω~10KΩ
Maximum withstand voltage: 1500V
Maximum accuracy: 1%
IP level: IP33
Vibration: 0.5g
Temperature drift range: ≤400ppm/℃
Working temperature range: -55℃～+275℃
Application areas: power supply system, charging equipment
Description
80W 20Ω Cement Resistor is built for soft start and surge protection applications. With a non-inductive design, it ensures fast response and minimal EMI, ideal for power supplies and motor drives. The ceramic core and cement coating improve heat resistance and flame protection, ensuring safety and long service life.
Its compact rectangular body offers easy mounting, while the 20Ω resistance effectively limits inrush current and voltage spikes. This resistor combines performance, reliability, and cost-efficiency—perfect for engineers demanding stable results in industrial environments.
Key Features of 80W cement resistor
Rated Power: 80W
Resistance: 20Ω ±5%
Operating Temperature: -55°C to +200°C
Material: Ceramic core with cement coating
Non-inductive design: Ideal for high-frequency applications
Applications: Soft start, surge protection, inverter circuits, motor drives
Product Dimensions
| Rated Power (W) | L±1 | L1±1 | L2±10 | W±0.5 | H±0.5 | M±0.2 | N±0.2 | Resistance Range (Ω) | Outlet Mode | Weight (g) |
|---|---|---|---|---|---|---|---|---|---|---|
| 60W | 90 | 35 | 200 | 45 | 15 | 10 | 5 | 0.1~10K | Lead Wire | 140 |
| 80W | 90 | 35 | 200 | 45 | 15 | 10 | 5 | 0.1~10K | Lead Wire | 140 |
| 100W | 90 | 35 | 200 | 45 | 15 | 10 | 5 | 0.1~10K | Lead Wire | 140 |
Electrical Characteristics
| Property | Test Method | Performance Requirements | Test Standard |
|---|---|---|---|
| Terminal Strength | 20N tensile load for 10 seconds | No visible damage | GB/T5729 4.16 |
| Vibration Resistance | Frequency 10Hz–500Hz, acceleration 10g | No visible damage | GB/T5729 4.22 |
| Short-time Overload | 10× rated power for 5 seconds | ΔR ≤ ±(2%R + 0.1Ω) | GB/T5729 4.13 |
| Insulation Resistance | 500V ±50V DC between leads and aluminum housing | ≥100MΩ | GB/T5729 4.6.1.3 |
| Dielectric Withstanding Voltage | 1000Vac, 5mA, 1 minute | No breakdown or flashover | GB/T5729 4.7 |
| Load Life | Rated power for 96h (1.5h ON / 0.5h OFF cycles at room temperature) | No visible damage | GB/T5729 4.25.2 |
| Damp Heat, Steady State | (40±2)℃, (93±3)%RH, 96 hours | ΔR ≤ ±(5%R + 0.1Ω) | GB/T5729 4.24.2.1.a |
| Rapid Temperature Change | -55℃ to +155℃, 5 cycles | ΔR ≤ ±(2%R + 0.1Ω) | GB/T5729 4.19 |
Resistor usage recommendations
It is recommended to leave 1.5 times the power margin when using resistors in circuits. For example, if the voltage in the circuit is 100V and the current is 0.01A, the power is calculated as: P=100*0.01=1W. At this time, a 1W resistor cannot be used, so 1*1.5=1.5W is calculated. There is no 1.5W resistor, so a 2W resistor is required.
Typical Applications
Motor soft start
Surge limiting in AC power lines
Power supplies
Inverter drive protection
Energy discharge for capacitor banks
Installation Tip
To ensure optimal heat dissipation, always mount the resistor on a metallic surface or use a heat sink. This improves lifespan and minimizes thermal stress.
