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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 poli; Contatti principali: 3NO; Standard auxiliary contacts: 2a2b (double contact design for higher reliability)
Rated current AC‑3: 80 UN; Corresponding motor power: 18.5 kW at 200–240 V, 37 kW at 380–440 V
Rated current AC‑1 / Thermal current: 135 UN
Rated insulation voltage Ui: 690 V; Vita meccanica: fino a 10 milioni di operazioni; Electrical life at AC‑3: 1 milioni di operazioni
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); Frequenza: 50/60 Hz
Dimensioni (W×D×H): 88 × 117 × 127 mm; Peso: approx. 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)
| Marca | Replacement Model | Note |
| Fuji (Upgraded) | SC‑N4/G (DC coil), SC80BAS series | Mounting dimensions compatible; SC80BAS‑122 corresponds to SC‑N4/SE |
| Siemens | 3RT2036‑1BB40 (80 UN, AC‑3) | Same current rating; check auxiliary contact count |
| Schneider | LC1D80 series (80 UN, 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 UN, AC‑1 (resistive/heating) 135 UN; 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 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.
- Applicazioni tipiche
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
Series: Fuji NEO SC Series
Current rating: AC‑3 80A (for 37kW/380V motor)
- Key Parameters to Verify
- Contatti principali: 3 poles NO (3NO)
- Standard auxiliary contacts: 2a2b (2NO + 2NC)
- Rated operating current:
AC‑3 (motor): 80UN
AC‑1 (resistive): 135UN
- Suitable motor: 37kW at 380V
- Coil voltage (critical):
Common: AC220V / AC380V / AC110V
DC type: SC‑N4/G (DC coil)
- Direct Cross‑Brand Replacement Table
| Marca | Replacement Model | Note |
| Fuji | SC80BAS | New replacement, same mounting dimensions |
| Schneider | LC1D80 | 80UN, 2a2b available |
| Siemens | 3RT2036 | 80UN, general replacement |
| ABB | A185‑30 | AC‑3 80A equivalent |
> Replacement rule: 80UN + 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)
| Modello | 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 | Modello | Configurazione dei contatti | Note |
| Top Mount | SZ‑A22T | 2NO+2NC | Max 1 unit; cannot use with side mount |
| SZ‑A20T | 2NO | Add NO contacts | |
| SZ‑A11T | 1NA+1NC | General expansion | |
| SZ‑A02T | 2NC | Add NC contacts | |
| Side Mount | SZ‑AS22T | 2NO+2NC | Max 1 per side, 2 total |
| SZ‑AS20T | 2NO | Side NO expansion | |
| SZ‑AS11T | 1NA+1NC | Side general expansion | |
| SZ‑AS02T | 2NC | Side NC expansion |
> Rule: Top and side mounting cannot be used together; total max 4a4b
- Surge Suppression Units
| Modello | 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 | Circuito principale | 3‑phase surge absorption for VFD/PLC protection |
> Nota: AC/DC coils require dedicated suppressors; not interchangeable
- Safety Protection Accessories
| Modello | Nome | 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
| Modello | Tipo | 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 |
> Nota: Super magnet coil requires SZ‑GS/N4 driver; not direct replacement
- Mounting & Wiring Accessories
| Modello | Nome | 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)
| Modello | 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 | Contatti ausiliari | 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 |
