Контактор,автоматический выключатель,солнечный инвертор,электрический счетчик,солнечные батареи
CJ40-125-380V is a mainstream industrial Контактор переменного тока in China, complying with standards GB/T 14048.4 и МЭК 60947-4-1. It is widely used for switching control in three-phase motor control and power distribution circuits.
- Model Explanation
CJ: Code for AC Contactor
40: Design series number
125: Rated operational current of main circuit: 125A at 380V under utilization category AC-3
380В: Rated control voltage of electromagnetic coil (AC 50Hz), also suitable for main circuit rated voltage 380V
- Ключевые технические параметры
2.1 Main Circuit Parameters
| Элемент | Спецификация |
| Rated insulation voltage Ui | 690В (1140V for some brands) |
| Conventional thermal current Ith | 125А |
| Max. motor power (АС-3) | 380В:75kW; 660В:55kW; 1140В:55kW |
| Number of main poles | 3-столб (стандартный) |
| Rated operating frequency (АС-3) | 1200 operations/hour |
| Short-circuit protection device (SCPD) | Recommended: RT16-250 fuse |
2.2 Катушка & Operating Characteristics
Rated control voltage: AC 380V/50Hz; options: 220В, 110В, 36В, и т. д..
Pull-in voltage: (85%~110%) of rated coil voltage Us
Drop-out voltage: (20%~75%) of rated coil voltage Us
Coil consumption: Starting 492VA, Holding 61VA/20W
2.3 Auxiliary Contact Parameters (standard for 63A and above)
Conventional thermal current: 10А
Rated control capacity: AC 300VA, DC 60W
Standard configuration: 4 НЕТ + 2 Северная Каролина; необязательный: 3 НЕТ + 3 Северная Каролина, 2 НЕТ + 2 Северная Каролина
Utilization categories: АС-15 (AC control), DC-13 (DC control)
- Construction & Mounting Dimensions
- Функции: Direct-operated double-break structure, silver-alloy main contacts, arc-resistant plastic + steel grid arc chute, strong arc extinguishing performance, high durability.
- Mechanical life: 10 миллион операций; Electrical life: 1.2 миллион операций (АС-3)
- Mounting dimensions (common for CJ40-63~125):
Overall dimensions: 116мм (Вт) × 143mm (ЧАС) × 154mm (Д)
Mounting hole spacing: Horizontal 100±0.435mm, Vertical 90±0.435mm
Mounting hole diameter: φ5.8mm
Mounting: Screw fixing, suitable for TH75 mounting rail
- Application & Operating Conditions
4.1 Main Applications
Used in AC 50/60Hz power systems up to 1140V for frequent starting/stopping and remote control of three-phase squirrel-cage induction motors.
Can be combined with thermal relays / motor protectors to form magnetic starters for overload protection.
Also used for switching resistive loads, capacitor banks, and other distribution loads.
4.2 Standard Operating Conditions
Температура окружающей среды: -5℃ ~ +40 ℃, average ≤ +35℃ in 24h
Высота: ≤ 2000m
Степень загрязнения: 3; Категория установки: Ⅲ
Mounting: Inclination ≤ ±5° from vertical; no significant shock or vibration
- Selection & Usage Notes
- Motor control: Under AC-3 duty, verify contactor current ≥ 1.25 × motor rated current. For heavy-duty / frequent inching, select one size larger.
- Электропроводка: Use copper cables with adequate current rating; tighten terminals to avoid overheating. Observe coil terminals A1/A2 polarity; do not exceed rated voltage.
- Maintenance: Regularly inspect arc chute and contacts for damage. Maintenance only when power is disconnected.
- Ordering: Specify model, coil voltage, and auxiliary contact configuration. Default: 4 НЕТ + 2 NC if not specified.
Summary of Cross‑Brand Replacements for CJ40-125-380V
Matching Criteria:
AC-3 at 380V, rated operational current ≥125A, 3-столб, coil AC380V 50Hz, plus mounting compatibility, вспомогательные контакты, and duty compatibility.
Priorities: Direct Drop‑in Replacements → Domestic Equivalents → Imported Equivalents.
Priority 1: 100% Direct Drop‑in Replacements
Same CJ40 series from major Chinese brands, identical mounting, контакты, electrical characteristics.
- CHNT: CJ40-125 AC380V
- ДЕЛИКСИ: CJ40-125 AC380V
- TENGEN: CJ40-125 AC380V
- Shanghai People Electric: CJ40-125 AC380V
- HUANYU, GREATWALL: CJ40-125 AC380V
- Tianshui 213: CJ40-125 AC380V
Priority 2: Domestic Equivalent Series
| Бренд | Запасная модель | Key Features |
| CHNT | NXC-125 AC380V | New economical heavy‑duty, rail/screw mount, expandable aux contacts |
| CHNT | CJ20-125 AC380V | Classic national standard, fully compatible with CJ40 duty |
| CHNT | NC1-125 AC380V | Компактный, frequent starting, rail mount |
| ДЕЛИКСИ | CJX2s-F125 AC380V | High-current dedicated, excellent arc extinguishing |
| ДЕЛИКСИ | CDC1-125 AC380V | Long mechanical life, high-frequency operation |
| TENGEN | CJX4-125 AC380V | Compatible with LC1‑D mounting, for imported equipment replacement |
| Tianshui 213 | GSC2-125F AC380V | Heavy‑duty, high shock & vibration resistance |
Priority 3: Imported / Joint‑Venture Premium Models
| Бренд | Запасная модель | Key Features |
| Шнайдер | LC1D125Q7C | Classic D series, 125A AC-3, widely used |
| Шнайдер | LC1F125Q7C | Heavy‑duty F series, long life for continuous operation |
| АББ | A125-30-11 AC380V | Reliable general‑purpose |
| АББ | AF125-30-11 AC380V | Wide voltage coil, переменный/постоянный ток, strong voltage fluctuation resistance |
| Сименс | 3RT5055-1AP36 | SIRIUS premium, for PLC systems |
| Сименс | 3RT6055-1AP36 | Economy version, same ratings |
| Mitsubishi | S-N125 AC380V | Japanese standard, 120–125A range |
| LS (LG) | GMC-125 AC380V | Korean standard, cost‑effective |
Core Replacement Rules
- No compromise on ratings: Must meet AC-3, ≥125A at 380V, 3‑pole, coil AC380V. Do NOT downsize.
- Aux contact matching: Original = 4 НЕТ + 2 Северная Каролина. Use auxiliary contact modules if needed.
- Mounting check: Direct replacement for same CJ40 series; verify hole spacing for cross‑series / импортированные модели.
- Duty upgrade: For frequent inching, reversing, heavy loads: use longer‑life models or step up to 160A. For light loads: economical models are acceptable.
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