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Complete Technical Specifications, Replacement Models and Selection Points for Fuji SC‑N4 (NEO SC Series) 3‑Pole AC Contactor
- Core Specifications
1.1 Main Circuit Parameters
Poles: 3 เสา; Main contacts: 3เลขที่; Standard auxiliary contacts: 2a2b (double contact design for higher reliability)
Rated current AC‑3: 80 ก; Corresponding motor power: 18.5 kW at 200–240 V, 37 kW at 380–440 V
Rated current AC‑1 / Thermal current: 135 ก
Rated insulation voltage Ui: 690 วี; Mechanical life: ขึ้นไป 10 ล้านการดำเนินงาน; Electrical life at AC‑3: 1 ล้านการดำเนินงาน
การรับรอง: IEC/EN 60947‑4‑1, แอล, ซีเอสเอ, ซีอี, ซีซีซี
1.2 Coil and Mounting
Available coil voltages: AC 100V, 200วี, 220วี, 380วี; AC/DC universal type also available (e.g. SC‑N4/SE); Frequency: 50/60 Hz
ขนาด (ก×ล×ส): 88 × 117 × 127 มม; น้ำหนัก: ประมาณ. 1.5 กก
Mounting: Standard DIN rail or screw mounting; Can be directly fitted with Fuji thermal overload relays (e.g. TR‑N4 series) to form a starter
- Cross‑Brand Replacement Models (Same Rating, Direct Interchangeable – Match Coil Voltage)
| ยี่ห้อ | Replacement Model | หมายเหตุ |
| Fuji (Upgraded) | SC‑N4/G (DC coil), SC80BAS series | Mounting dimensions compatible; SC80BAS‑122 corresponds to SC‑N4/SE |
| ซีเมนส์ | 3RT2036‑1BB40 (80 ก, AC‑3) | Same current rating; check auxiliary contact count |
| ชไนเดอร์ | LC1D80 series (80 ก, TeSys D) | Standard 2a2b configuration available |
| เอบีบี | 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 (มอเตอร์) 80 ก, AC‑1 (resistive/heating) 135 ก; Do NOT use AC‑1 contactors for motor duty in place of AC‑3.
- Auxiliary contact quantity: SC‑N4 standard: 2โน+2เอ็นซี; 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.
- การใช้งานทั่วไป
Commonly used for direct starting, star‑delta starting of three‑phase asynchronous motors up to 37 กิโลวัตต์ (380 วี); also for power switching control in fans, ปั๊ม, เครื่องฉีดพลาสติก, air compressors and other industrial equipment.
Fuji Contactor SC‑N4
Purchasing & Replacement Checklist
(Can be sent directly to purchasing / warehouse / maintenance for ticking)
- การยืนยันรุ่น
Main model: SC‑N4
Series: Fuji NEO SC Series
Current rating: AC‑3 80A (for 37kW/380V motor)
- Key Parameters to Verify
- Main contacts: 3 poles NO (3เลขที่)
- Standard auxiliary contacts: 2a2b (2เลขที่ + 2เอ็นซี)
- Rated operating current:
AC‑3 (มอเตอร์): 80ก
AC‑1 (resistive): 135ก
- Suitable motor: 37kW at 380V
- แรงดันไฟฟ้าคอยล์ (critical):
Common: ไฟ AC220V / AC380V / AC110V
DC type: SC‑N4/G (DC coil)
- Direct Cross‑Brand Replacement Table
| ยี่ห้อ | Replacement Model | หมายเหตุ |
| Fuji | SC80BAS | New replacement, same mounting dimensions |
| ชไนเดอร์ | LC1D80 | 80ก, 2a2b available |
| ซีเมนส์ | 3RT2036 | 80ก, general replacement |
| เอบีบี | A185‑30 | AC‑3 80A equivalent |
> Replacement rule: 80ก + 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: รางปีกนก / 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)
| แบบอย่าง | ช่วงปัจจุบัน | Application |
| 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 | ประเภทมาตรฐาน, cost‑effective |
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
| Mounting | แบบอย่าง | Contact Configuration | หมายเหตุ |
| Top Mount | SZ‑A22T | 2โน+2เอ็นซี | Max 1 unit; cannot use with side mount |
| SZ‑A20T | 2เลขที่ | Add NO contacts | |
| SZ‑A11T | 1NO+1NC | General expansion | |
| SZ‑A02T | 2เอ็นซี | Add NC contacts | |
| Side Mount | SZ‑AS22T | 2โน+2เอ็นซี | Max 1 per side, 2 total |
| SZ‑AS20T | 2เลขที่ | Side NO expansion | |
| SZ‑AS11T | 1NO+1NC | Side general expansion | |
| SZ‑AS02T | 2เอ็นซี | Side NC expansion |
> Rule: Top and side mounting cannot be used together; total max 4a4b
- Surge Suppression Units
| แบบอย่าง | Application | Function |
| SZ‑Z | AC coil | RC snubber, suppresses switching surge |
| SZ‑Z/DC | DC coil | For SC‑N4/G, with freewheeling diode |
| SZ‑ZM | วงจรหลัก | 3‑phase surge absorption for VFD/PLC protection |
> บันทึก: AC/DC coils require dedicated suppressors; not interchangeable
- Safety Protection Accessories
| แบบอย่าง | ชื่อ | Function |
| 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
| แบบอย่าง | พิมพ์ | คุณสมบัติ |
| 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 |
> บันทึก: Super magnet coil requires SZ‑GS/N4 driver; not direct replacement
- Mounting & Wiring Accessories
| แบบอย่าง | ชื่อ | 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 mm²
- Replacement Parts (For Maintenance)
| แบบอย่าง | Part Name | Description |
| SC‑N4 Main Contact Set | ผู้ติดต่อหลัก | 3 NO silver alloy contacts; replace at end of life |
| SC‑N4 Auxiliary Contact Set | ติดต่อเสริม | 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)
| Application | 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 |
