Table of Contents
Model Format of the low-Voltage AC Contactor
CJ20 – □ / □
| Code | Meaning |
|---|---|
| CJ | Abbreviation of “Contactor” |
| 20 | Design series number (CJ20 series) |
| □ | Rated operational current (AC-6b), e.g., 100 = 100A |
| /□ (optional) | Coil control voltage (e.g., 220 for AC220V, 380 for AC380V, 24DC for DC24V) |
Introduction to the low-Voltage AC Contactor
ZHIMING brand of the CJ20 series AC contactor for switching shunt capacitors (hereinafter referred to as “the contactor”) is mainly used in AC power systems with a frequency of 50Hz or 60Hz and a rated voltage up to 660V. It is designed for switching shunt capacitors in low-voltage reactive power compensation banks.
When equipped with a surge suppression device, the contactor can effectively limit inrush current during closing and suppress overvoltage during opening, thereby enhancing the safety and longevity of the power compensation system.
Structural Features of the low-Voltage AC Contactor
- Arc chute design ensures safe arc extinction and longer contact life.
- Silver alloy contacts for better conductivity and resistance to welding.
- Surge suppression unit (optional): integrated resistor-inductor group effectively mitigates inrush current and overvoltage.
- Flexible installation: available with both panel-mounting and rail-mounting versions.
Typical Applications of the low-Voltage AC Contactor
- Low-voltage power capacitor banks
- Automatic power factor correction (APFC) systems
- Reactive power compensation cabinets
- Industrial distribution panels for capacitor group switching
Notes
- If no control voltage is specified, the default coil voltage is AC 380V (based on the Chinese market standard).
- Surge suppression versions may be marked with a suffix such as CJ20-100Z, where “Z” indicates surge suppression (R-L group).
- Auxiliary contacts can be added and indicated separately in BOM (e.g., 1NO+1NC, etc.).
Compliance Standards：
GB/T 14048.1, GB/T 14048.4, IEC 60947-4-1
Technical Parameter of the of the low-Voltage AC Contactor
| Item | Specification |
| Rated insulation voltage | Up to 660V |
| Rated working voltage | 380V / 660V |
| Applicable frequency | 50Hz / 60Hz |
| Utilization category | AC-6b (capacitor switching) |
| Rated operating current (AC-6b) | 20A ~ 630A (depending on model) |
| Rated control voltage (Coil) | AC 220V / 380V / 110V / DC 24V (customizable) |
| Conventional thermal current (Ith) | 25A ~ 800A |
| Mechanical life | ≥ 1 million operations |
| Electrical life (AC-6b) | ≥ 0.1 million operations |
| Installation category | Class III |
| Pollution degree | Class III |
| Protection class | IP20 (basic) can be enhanced with enclosure |
| Mounting method | Vertical, inclination angle ≤ ±5° |
| Ambient temperature | –5°C to +40°C; daily average ≤ +35°C |
| Relative humidity | ≤ 50% at +40°C (up to 90% at 25°C with condensation) |
| Altitude | ≤ 2000 meters |
| Standard compliance | GB/T 14048.1, GB/T 14048.4, IEC 60947-4-1 |
| Type | Ui (V) | Ue (V) | Ith (A) | Rated operational current under intermittent periodic duty（A） | AC-3 Pe (kW) | Rated operational current under uninterrupted duty(A) | Weight (kg) | |||
| AC-1 | AC-2 | AC-3 | AC-4 | |||||||
| CJ20-10 | 690 | 220 | 10 | 10 | 10 | 10 | 2.2 | 10 | 0.353 | |
| 380 | 4 | |||||||||
| 660 | 5.2 | 5.2 | ||||||||
| CJ20-16 | 690 | 220 | 16 | 16 | 16 | 16 | 4.5 | 16 | 0.416 | |
| 380 | 7.5 | |||||||||
| 660 | 13 | 13 | 11 | |||||||
| CJ20-25 | 690 | 220 | 32 | 32 | 25 | 25 | 5.5 | 32 | 0.67 | |
| 380 | 11 | |||||||||
| 660 | 14.5 | 14.5 | 13 | |||||||
| CJ20-40 | 690 | 220 | 55 | 55 | 40 | 40 | 11 | 55 | 1.32 | |
| 380 | 22 | |||||||||
| 660 | 25 | 25 | ||||||||
| CJ20-63 | 690 | 220 | 80 | 80 | 63 | 63 | 63 | 18 | 80 | 2.9 |
| 380 | 30 | |||||||||
| 660 | 40 | 40 | 40 | 35 | ||||||
| CJ20-100 | 690 | 220 | 125 | 125 | 100 | 100 | 100 | 28 | 125 | 3 |
| 380 | 50 | |||||||||
| 660 | 63 | 63 | 63 | |||||||
| CJ20-160 | 690 | 220 | 200 | 200 | 160 | 160 | 160 | 48 | 200 | 5.5 |
| 380 | 85 | |||||||||
| 660 | 100 | 100 | 80 | |||||||
| CJ20-160/11 | 1140 | 1140 | 80 | 80 | 80 | |||||
