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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 極; Main contacts: 3いいえ; Standard auxiliary contacts: 2a2b (double contact design for higher reliability)
Rated current AC‑3: 80 あ; Corresponding motor power: 18.5 kW at 200–240 V, 37 kW at 380–440 V
Rated current AC‑1 / Thermal current: 135 あ
Rated insulation voltage Ui: 690 V; 機械的寿命: up to 10 100万操作; Electrical life at AC‑3: 1 100万操作
Certifications: IEC/EN 60947‑4‑1, UL, CSA, CE, CCC
1.2 Coil and Mounting
Available coil voltages: AC 100V, 200V, 220V, 380V; AC/DC universal type also available (e.g. SC‑N4/SE); Frequency: 50/60 Hz
寸法 (W×D×H): 88 × 117 × 127 mm; 重さ: 約. 1.5 kg
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)
| ブランド | Replacement Model | 注意事項 |
| 富士山 (Upgraded) | SC‑N4/G (DC coil), SC80BAS series | Mounting dimensions compatible; SC80BAS‑122 corresponds to SC‑N4/SE |
| シーメンス | 3RT2036‑1BB40 (80 あ, AC‑3) | Same current rating; check auxiliary contact count |
| シュナイダー | LC1D80 series (80 あ, TeSys D) | Standard 2a2b configuration available |
| ABB | 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 (motor) 80 あ, AC‑1 (resistive/heating) 135 あ; Do NOT use AC‑1 contactors for motor duty in place of AC‑3.
- Auxiliary contact quantity: SC‑N4 standard: 2NO+2NC; additional modules can be added if more contacts are required.
- Ambient conditions: IP20保護, 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.
- 代表的な用途
Commonly used for direct starting, star‑delta starting of three‑phase asynchronous motors up to 37 kW (380 V); also for power switching control in fans, pumps, 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
シリーズ: Fuji NEO SC Series
Current rating: AC‑3 80A (for 37kW/380V motor)
- Key Parameters to Verify
- Main contacts: 3 poles NO (3いいえ)
- Standard auxiliary contacts: 2a2b (2いいえ + 2ノースカロライナ州)
- Rated operating current:
AC‑3 (motor): 80あ
AC‑1 (resistive): 135あ
- Suitable motor: 37380VでkW
- Coil voltage (critical):
Common: AC220V / AC380V / AC110V
DC type: SC‑N4/G (DC coil)
- Direct Cross‑Brand Replacement Table
| ブランド | Replacement Model | 注意事項 |
| 富士山 | SC80BAS | New replacement, same mounting dimensions |
| シュナイダー | LC1D80 | 80あ, 2a2b available |
| シーメンス | 3RT2036 | 80あ, general replacement |
| ABB | A185‑30 | AC‑3 80A equivalent |
> Replacement rule: 80あ + 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)
| モデル | Current Range | 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 | Standard type, 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 | モデル | Contact Configuration | 注意事項 |
| Top Mount | SZ‑A22T | 2NO+2NC | Max 1 unit; cannot use with side mount |
| SZ‑A20T | 2いいえ | Add NO contacts | |
| SZ‑A11T | 1NO+1NC | General expansion | |
| SZ‑A02T | 2ノースカロライナ州 | Add NC contacts | |
| Side Mount | SZ‑AS22T | 2NO+2NC | Max 1 per side, 2 total |
| SZ‑AS20T | 2いいえ | Side NO expansion | |
| SZ‑AS11T | 1NO+1NC | Side general expansion | |
| SZ‑AS02T | 2ノースカロライナ州 | Side NC expansion |
> Rule: Top and side mounting cannot be used together; total max 4a4b
- Surge Suppression Units
| モデル | 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 | 主回路 | 3‑phase surge absorption for VFD/PLC protection |
> 注記: AC/DC coils require dedicated suppressors; not interchangeable
- Safety Protection Accessories
| モデル | 名前 | 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
| モデル | Type | Features |
| 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 |
> 注記: Super magnet coil requires SZ‑GS/N4 driver; not direct replacement
- Mounting & Wiring Accessories
| モデル | 名前 | 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)
| モデル | Part Name | Description |
| SC‑N4 Main Contact Set | Main Contacts | 3 NO silver alloy contacts; replace at end of life |
| SC‑N4 Auxiliary Contact Set | 補助接点 | 2a2b contacts; replace if poor connection |
| SC‑N4 Coil | Magnetic Coil | Match original voltage (AC220V/380V etc.) |
> メンテナンス: 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 |
| 頻繁な起動 | 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 |
