Description

1. Part-number breakdown

• SC-E02A = Fuji SC-E frame size 2, 20 A AC-3, 25 A AC-1
• SCE09AAA-C = 24 VDC coil, 1 N/O + 1 N/C auxiliary, 4 kW elevator duty, –25 °C…+60 °C
• Contact material: AgCdO-free silver alloy, >100,000 electrical cycles @ 20 A

2. Safety first—lock-out & verify Contactor switches 380-480 VAC brake or pump circuits. Lock the upstream breaker, hang a lock-out tag and wait 60 s for the DC coil to discharge. Confirm zero energy with a CAT-III meter before touching any lug.
3. Mechanical mounting—keep it cool Overall size: 45 × 58 × 68 mm (without coil), mass 0.32 kg. Snap onto 35 mm DIN rail; torque M4 mounting screws 1.5 N·m if plate-mounted. Maintain 30 mm side clearance; every 10 °C rise halves contact life. NYE supplies a free DIN clip (NY-CLIP-SCE02) and vibration pad (NY-VIB-SCE02) to reduce structure-borne noise.
4. Wiring map (print and stick inside controller) L1/L2/L3 IN: 2.5 mm², 600 V, 105 °C silicone, torque 1.2 N·m
   T1/T2/T3 OUT: same gauge to motor brake or pump
   Coil: A1-A2, 0.5 mm², 105 °C, torque 0.8 N·m
   Auxiliary: 13-14 (N/O), 21-22 (N/C), 1 mm², 30 V 5 A
   PE: 4 mm² green/yellow to cabinet earth; leakage <1 mA
5. Pick-up / drop-out test Apply 24 VDC; contactor must close in <20 ms, coil current 90 mA @ 20 °C.
   Remove coil voltage; drop-out <15 ms.
   If chatter or >30 ms delay, coil voltage is low or contact faces are oxidised—replace.
6. Full-load heat run Connect 20 A resistive load for 1 h.
   Temperature rise: coil <40 K, contact terminal <55 K @ 25 °C ambient.
   Thermography: <70 °C on lug; hotter spots indicate loose terminals or worn contacts.
7. Contact life calculation Fuji data: 100,000 cycles @ 20 A AC-3.
   Translate to elevator duty: Light traffic (office, 300 starts/day) – 109 k cycles/year → replace ≈ 11 years; inspect every 3 years. Medium traffic (mall, 600 starts/day) – 219 k cycles/year → replace ≈ 5 years; inspect every 2 years. Heavy traffic (metro, 1,200 starts/day) – 438 k cycles/year → replace ≈ 2.5 years; inspect every 12 months. Mechanical life: 10 million cycles—electrical wear dictates the interval.
8. Preventive inspection checklist Monthly: visual LED, listen for chatter during start. Quarterly: measure coil voltage; <20 VDC indicates low supply or high resistance. Annually: megger coil to contact >100 MΩ; <10 MΩ indicates moisture ingress. Bi-annually: torque test power terminals; vibration loosens them, causing overheating and fault F09.
9. Rapid swap (downtime < 3 min) a) Power down, lock-out, wait 60 s. b) Photograph L1/L2/L3 and A1/A2 orientation. c) Remove DIN clip, slide old contactor out. d) Insert new Nanjing Zhuye SCE09AAA-C, snap onto rail. e) Restore wires, torque 1.2 N·m power, 0.8 N·m coil. f) Power up, run pick-up/drop-out test. g) Log serial number and cycle counter; return old unit for recycling.
10. Recycling & sustainability Nanjing Zhuye offers prepaid UPS labels inside every carton.
    Returned contactors are stripped: silver contacts refined, copper coil remelted, steel housing shot-blasted and reused.
    One recycled SC-E02A saves 0.6 kg CO₂—enough to power the same elevator for a week.