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Complete Technical Specifications, Replacement Models and Selection Points for Fuji SC‑N4 (NEO SC Series) 3‑Pole AC Contactor
- Основные характеристики
1.1 Main Circuit Parameters
поляки: 3 столбы; Main contacts: 3НЕТ; Standard auxiliary contacts: 2a2b (double contact design for higher reliability)
Rated current AC‑3: 80 А; Corresponding motor power: 18.5 kW at 200–240 V, 37 kW at 380–440 V
Rated current AC‑1 / Thermal current: 135 А
Номинальное напряжение изоляции Ui: 690 В; Механическая жизнь: up to 10 миллион операций; Electrical life at AC‑3: 1 миллион операций
Сертификаты: IEC/EN 60947‑4‑1, UL, CSA, CE, CCC
1.2 Coil and Mounting
Available coil voltages: AC 100V, 200В, 220В, 380В; AC/DC universal type also available (например. SC‑N4/SE); Частота: 50/60 Гц
Размеры (Ш×Г×В): 88 × 117 × 127 мм; Weight: приблизительно. 1.5 кг
Монтаж: Standard DIN rail or screw mounting; Can be directly fitted with Fuji thermal overload relays (например. TR‑N4 series) to form a starter
- Cross‑Brand Replacement Models (Same Rating, Direct Interchangeable – Match Coil Voltage)
| Бренд | Запасная модель | Примечания |
| Fuji (Upgraded) | SC‑N4/G (DC coil), SC80BAS series | Mounting dimensions compatible; SC80BAS‑122 corresponds to SC‑N4/SE |
| Сименс | 3RT2036‑1BB40 (80 А, AC‑3) | Same current rating; check auxiliary contact count |
| Шнайдер | LC1D80 series (80 А, TeSys D) | Standard 2a2b configuration available |
| АББ | A185‑30‑11 (note current labeling difference) | Ensure AC‑3 80 A matching |
- Selection and Replacement Notes
- Coil voltage must be exact: Different voltages (AC200V vs AC220V, AC vs DC) are not interchangeable; otherwise coil burnout or failure to pull in will occur.
- Load type distinction: AC‑3 (мотор) 80 А, AC‑1 (resistive/heating) 135 А; Do NOT use AC‑1 contactors for motor duty in place of AC‑3.
- Auxiliary contact quantity: SC‑N4 standard: 2НО+2НЗ; additional modules can be added if more contacts are required.
- Ambient conditions: IP20 protection, operating temp ‑5℃～+40℃; altitude ≤2000 m; humidity ≤85% non‑condensing.
- Arc extinction & surge: Surge suppressor (RC or varistor) recommended across coil to reduce interference.
- Типичные применения
Commonly used for direct starting, star‑delta starting of three‑phase asynchronous motors up to 37 кВт (380 В); also for power switching control in fans, насосы, injection molding machines, air compressors and other industrial equipment.
Fuji Contactor SC‑N4
Purchasing & Replacement Checklist
(Can be sent directly to purchasing / warehouse / maintenance for ticking)
- Model Confirmation
Main model: SC‑N4
Ряд: Fuji NEO SC Series
Current rating: AC‑3 80A (for 37kW/380V motor)
- Key Parameters to Verify
- Main contacts: 3 poles NO (3НЕТ)
- Standard auxiliary contacts: 2a2b (2НЕТ + 2Северная Каролина)
- Rated operating current:
AC‑3 (мотор): 80А
AC‑1 (resistive): 135А
- Suitable motor: 37kW at 380V
- Coil voltage (critical):
Common: 220 В переменного тока / AC380В / 110 В переменного тока
DC type: SC‑N4/G (DC coil)
- Direct Cross‑Brand Replacement Table
| Бренд | Запасная модель | Примечания |
| Fuji | SC80BAS | New replacement, same mounting dimensions |
| Шнайдер | LC1D80 | 80А, 2a2b available |
| Сименс | 3RT2036 | 80А, general replacement |
| АББ | A185‑30 | AC‑3 80A equivalent |
> Replacement rule: 80А + same coil voltage + 2a2b auxiliary contacts
- 5‑Point Order & Installation Checklist
☐ Coil voltage matches exactly (AC/DC not interchangeable)
☐ Auxiliary contacts: 2a2b (add modules if needed)
☐ For motors: must be AC‑3 80A class
☐ Mounting: DIN rail / screw fixing both supported
☐ If surge suppressor / rectifier needed: note in advance
- Standard Accessories
Matching thermal relay: TR‑N4 series
Optional add‑ons: side auxiliary contact modules, surge suppressors
Complete Accessory Model Manual for Fuji Contactor SC‑N4
Below is the dedicated accessory list for SC‑N4 (NEO SC series), sorted by function with exact models, specifications and matching points for direct purchasing and replacement.
- Core Matching Thermal Overload Relay (Required)
| Модель | Текущий диапазон | Приложение |
| TR‑N4 | 50–80 A | Dedicated for SC‑N4; clip‑on mounting, no extra wiring |
| TR‑N4/3 | 50–80 A | With phase failure protection |
| TR‑N4/2 | 50–80 A | Стандартный тип, экономически эффективный |
Selection: Set thermal relay current to 1.1–1.25 × motor rated current
- Auxiliary Contact Modules (Control Circuit Expansion)
SC‑N4 standard: 2a2b; expandable via top / side mounting
| Монтаж | Модель | Конфигурация контактов | Примечания |
| Top Mount | SZ‑A22T | 2НО+2НЗ | Max 1 единица; cannot use with side mount |
| SZ‑A20T | 2НЕТ | Add NO contacts | |
| SZ‑A11T | 1НО+1НЗ | General expansion | |
| SZ‑A02T | 2Северная Каролина | Add NC contacts | |
| Side Mount | SZ‑AS22T | 2НО+2НЗ | Max 1 per side, 2 total |
| SZ‑AS20T | 2НЕТ | Side NO expansion | |
| SZ‑AS11T | 1НО+1НЗ | Side general expansion | |
| SZ‑AS02T | 2Северная Каролина | Side NC expansion |
> Rule: Top and side mounting cannot be used together; total max 4a4b
- Surge Suppression Units
| Модель | Приложение | Функция |
| SZ‑Z | AC coil | RC snubber, suppresses switching surge |
| SZ‑Z/DC | DC coil | For SC‑N4/G, with freewheeling diode |
| SZ‑ZM | Главная цепь | 3‑phase surge absorption for VFD/PLC protection |
> Примечание: AC/DC coils require dedicated suppressors; not interchangeable
- Safety Protection Accessories
| Модель | Имя | Функция |
| SZ‑N4T | Terminal cover | Covers main/aux terminals; prevents electric shock |
| SZ‑W | Live part cover | Enhances IP20 protection |
| SZ‑J | Operation counter | Mechanical counter for maintenance scheduling |
> Tip: SZ‑N4T is dedicated to SC‑N4; do NOT replace with larger models like SZ‑N8T
- Coil Optimization Accessories
| Модель | Тип | Функции |
| SZ‑GS/N4 | Super magnet coil | Energy saving; low holding current, low temperature rise |
| SZ‑CD | IC output coil driver | For PLC transistor output; prevents coil burnout |
| SZ‑Y | Delay release unit | Adjustable off delay: 0.1–30 s |
> Примечание: Super magnet coil requires SZ‑GS/N4 driver; not direct replacement
- Монтаж & Wiring Accessories
| Модель | Имя | Usage |
| SZ‑SP2 | 3‑phase parallel terminal block | For high current main circuit; reduces heating |
| SZ‑RW | Reversing wiring kit | For forward/reverse control; simplifies wiring |
| SZ‑B | Mounting bracket | For non‑standard cabinet installation |
> Recommend SZ‑SP2 when cable > 16 мм²
- Replacement Parts (For Maintenance)
| Модель | Part Name | Описание |
| SC‑N4 Main Contact Set | Основные контакты | 3 NO silver alloy contacts; replace at end of life |
| SC‑N4 Auxiliary Contact Set | Вспомогательные контакты | 2a2b contacts; replace if poor connection |
| SC‑N4 Coil | Magnetic Coil | Match original voltage (AC220V/380V etc.) |
> Maintenance: Replace if main contact wear > 1 mm or aux contact resistance > 100 mΩ
- Accessory Selection Quick Guide (By Application)
| Приложение | Recommended Combination |
| Standard motor control | TR‑N4 + SZ‑Z + SZ‑N4T |
| Frequent starting | TR‑N4/3 + SZ‑GS/N4 + SZ‑J |
| Inverter control | TR‑N4 + SZ‑ZM + SZ‑CD |
| Forward/reverse control | TR‑N4 + SZ‑RW + 2× SZ‑AS22T |
