คอนแทคเตอร์,เบรกเกอร์,อินเวอร์เตอร์พลังงานแสงอาทิตย์,มิเตอร์ไฟฟ้า,แบตเตอรี่พลังงานแสงอาทิตย์
CJ40-125-380V is a mainstream industrial คอนแทคเตอร์เอซี in China, complying with standards GB/T 14048.4 และไออีซี 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
380วี: Rated control voltage of electromagnetic coil (AC 50Hz), also suitable for main circuit rated voltage 380V
- พารามิเตอร์ทางเทคนิคที่สำคัญ
2.1 Main Circuit Parameters
| Item | ข้อมูลจำเพาะ |
| Rated insulation voltage Ui | 690วี (1140V for some brands) |
| Conventional thermal current Ith | 125ก |
| Max. motor power (เอซี-3) | 380วี:75กิโลวัตต์; 660วี:55กิโลวัตต์; 1140วี:55กิโลวัตต์ |
| Number of main poles | 3-เสา (มาตรฐาน) |
| Rated operating frequency (เอซี-3) | 1200 operations/hour |
| Short-circuit protection device (SCPD) | Recommended: RT16-250 fuse |
2.2 Coil & Operating Characteristics
Rated control voltage: AC 380V/50Hz; options: 220วี, 110วี, 36วี, ฯลฯ.
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: 10ก
Rated control capacity: AC 300VA, DC 60W
Standard configuration: 4 เลขที่ + 2 เอ็นซี; ไม่จำเป็น: 3 เลขที่ + 3 เอ็นซี, 2 เลขที่ + 2 เอ็นซี
Utilization categories: AC-15 (AC control), DC-13 (DC control)
- Construction & Mounting Dimensions
- คุณสมบัติ: 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 ล้านการดำเนินงาน; Electrical life: 1.2 ล้านการดำเนินงาน (เอซี-3)
- Mounting dimensions (common for CJ40-63~125):
Overall dimensions: 116มม (ว) × 143mm (H) × 154mm (ดี)
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
อุณหภูมิแวดล้อม: -5℃ ~ +40℃, average ≤ +35℃ in 24h
ระดับความสูง: ≤ 2000m
Pollution degree: 3; Installation category: 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.
- Wiring: 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 เลขที่ + 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-เสา, coil AC380V 50Hz, plus mounting compatibility, ผู้ติดต่อเสริม, 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, ผู้ติดต่อ, electrical characteristics.
- ประณีต: CJ40-125 AC380V
- DELIXI: 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
| ยี่ห้อ | Replacement Model | Key Features |
| ประณีต | NXC-125 AC380V | New economical heavy‑duty, rail/screw mount, expandable aux contacts |
| ประณีต | CJ20-125 AC380V | Classic national standard, fully compatible with CJ40 duty |
| ประณีต | NC1-125 AC380V | Compact, frequent starting, rail mount |
| DELIXI | CJX2s-F125 AC380V | High-current dedicated, excellent arc extinguishing |
| DELIXI | 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
| ยี่ห้อ | Replacement Model | Key Features |
| ชไนเดอร์ | LC1D125Q7C | Classic D series, 125A AC-3, widely used |
| ชไนเดอร์ | LC1F125Q7C | Heavy‑duty F series, long life for continuous operation |
| เอบีบี | A125-30-11 AC380V | Reliable general‑purpose |
| เอบีบี | AF125-30-11 AC380V | Wide voltage coil, AC/DC, strong voltage fluctuation resistance |
| ซีเมนส์ | 3RT5055-1AP36 | SIRIUS premium, for PLC systems |
| ซีเมนส์ | 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 เลขที่ + 2 เอ็นซี. Use auxiliary contact modules if needed.
- Mounting check: Direct replacement for same CJ40 series; verify hole spacing for cross‑series / โมเดลนำเข้า.
- 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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