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Schneider Easy9 series 4‑pole 63A C‑curve miniature circuit breaker, used for overload and short‑circuit protection in three‑phase four‑wire distribution systems. DIN‑rail mountable, suitable for final distribution in residential, commercial and light industrial applications.
1 Model Explanation
| Part | Meaning |
| EA9AN | Easy9 series standard MCB |
| 4 | 4 poles (3 phases + N), all poles with protection function |
| C | C tripping curve (5–10In instantaneous trip), suitable for lighting and resistive/slightly inductive mixed loads |
| 63 | Rated current 63A (at 30°C ambient) |
2 Key Technical Parameters
| Parameter | Value | Description |
| Rated operational voltage | 230/400V AC | Suitable for single‑/three‑phase systems |
| Rated insulation voltage | 400V AC | – |
| Rated frequency | 50/60Hz | Universal frequency |
| Rated breaking capacity | 6kA (400V) | Standard breaking capacity for general distribution |
| Tripping type | Thermal‑magnetic | Thermal overload protection + magnetic short‑circuit protection |
| Tripping curve | C‑curve | Instantaneous trip range: 5–10In, moderate inrush current withstand |
| Number of poles | 4P | 4 protected poles, neutral on the left |
| Mounting | 35mm DIN rail | Standard electrical cabinet mounting |
| Electrical endurance | 10,000 operations | Rated operating cycles |
| Mechanical endurance | 20,000 operations | Mechanical operating cycles |
| Dimensions | Approx. 85mm×78.5mm×18mm (4‑pole width) | Standard 4‑pole MCB size |
| Standards | GB16917/IEC60898 | National and international standards |
3 Core Functions & Features
- Overload protection: Thermal trip unit acts with current‑time accumulation to prevent overheating and burnout.
- Short‑circuit protection: Magnetic trip unit operates instantaneously (<0.1s) to clear short‑circuit current and protect equipment and wiring.
- Isolation function: Complies with EN/IEC 60947‑2, can be used as an isolating device.
- Quick make: Internal mechanism ensures fast circuit closing.
- Operation indication: Clear ON/OFF status indication for easy maintenance.
- Safety design: Anti‑misoperation structure, high insulation performance, safe and reliable.
4 Typical Applications
Residential distribution: Main incoming breaker for three‑phase four‑wire homes, protecting the entire electrical system.
Commercial buildings: Floor or zone main breaker in offices, shopping malls, hotels, etc.
Light industry: Branch circuit protection for workshops and production lines, suitable for mixed motor, lighting and socket loads.
Final distribution: Dedicated protection for three‑phase equipment (air conditioners, pumps, small machine tools).
5 Cross‑Brand Replacement Reference
| Brand | Replacement Model | Notes |
| ABB | S204‑C63 | Same 4P C63A, 6kA breaking capacity |
| Siemens | 5SY6463‑7CC | 4P C63A, standard breaking capacity |
| CHINT | NXB‑63 4P C63 | Domestic alternative, cost‑effective |
| Delixi | CDM30s‑63 4P C63 | Similar performance, compatible with domestic panels |
| Schneider upgrade | A9F94463 (Acti9 series) | Breaking capacity up to 15kA, improved performance |
6 Installation & Selection Notes
- Installation precautions
Must be mounted on 35mm standard DIN rail, installation depth ≥78.5mm
Terminal suitable for copper conductors: 1.5–35mm²
Neutral must be connected to the designated left terminal – do not reverse.
- Selection recommendations
Total three‑phase load current ≤63A, suitable for C‑curve loads (not heavy motor starting).
For distribution systems with short‑circuit current >6kA, upgrade to higher breaking capacity models (e.g., Acti9 series).
Derate at ambient temperature >30°C: current reduced by 1% per °C rise.
Schneider EA9AN4C63 vs Acti9 A9F94463 Full Comparison & Upgrade Recommendation
At a glance: A9F94463 (iC60L series) is superior to EA9AN4C63 in breaking capacity, compactness, accessory expandability, and electrical/mechanical endurance, suitable for higher short‑circuit risk and higher reliability/expandability requirements.
EA9AN4C63 is more economical and meets basic protection for standard residential and light commercial use.
1 Core Parameter Comparison
| Parameter | EA9AN4C63 (Easy9) | A9F94463 (Acti9 iC60L) | Key Difference |
| Series positioning | Economic standard | High‑performance standard | A9 higher‑end, richer functions |
| Poles/Current/Curve | 4P / 63A / C‑curve | 4P / 63A / C‑curve | Basic specs identical |
| Rated breaking capacity | 6kA (400V) | 15kA (400V) | A9 ×2.5 higher, stronger short‑circuit withstand |
| Rated insulation voltage | 400V AC | 400V AC | Same |
| Rated operational voltage | 230/400V AC | 230/400V AC | Same |
| Tripping type | Thermal‑magnetic | Thermal‑magnetic | Same |
| Mounting | 35mm DIN rail | 35mm DIN rail | Same |
| Dimensions | 85mm×78.5mm×18mm (4P) | 85mm×44.5mm×18mm (4P) | A9 depth –43%, saves panel space |
| Wiring capacity | 1.5–35mm² (copper) | 1.5–35mm² (copper), dual tunnel terminals | A9 more secure, same conductor range |
| Electrical endurance | 10,000 | 15,000 | A9 +50% |
| Mechanical endurance | 20,000 | 25,000 | A9 +25% |
| Protection degree | IP20 | IP20 (terminal IP20B) | A9 better terminal protection |
| Accessory compatibility | Basic accessories (aux./shunt) | Full Acti9 range (aux., shunt, UVP, remote, etc.) | A9 more expandable, supports Ti24 |
| Standards | GB16917/IEC60898 | GB16917/IEC60898/IEC60947‑2 | A9 covers more standards |
| Price range | Approx. ¥150–200 | Approx. ¥350–500 | A9 ~2–2.5× EA9 price |
2 Detailed Performance Differences
2.1 Breaking Capacity: Core Safety Gap
EA9AN4C63: 6kA, suitable for general systems with short‑circuit current ≤6kA.
A9F94463: 15kA high breaking capacity, reliably clears higher short‑circuit currents, reduces arc risk.
Suitable for:
Industrial plants, large commercial buildings
Distribution circuits near transformers
Systems where short‑circuit current may exceed 6kA
2.2 Compact Design: Better Space Utilization
A9F94463 depth only 44.5mm, greatly reduced from EA9AN4C63 78.5mm.
Benefits:
Fits slimmer distribution boards/cabinets
Saves installation space, eases maintenance
Ideal for retrofit projects with limited space
2.3 Endurance & Reliability: Longer‑Term Stability
Electrical endurance from 10k → 15k operations; mechanical 20k → 25k.
A9 series uses higher‑grade materials and precision manufacturing for better long‑term stability.
Better vibration and impact resistance for harsh environments.
2.4 Accessory Expandability: Flexible Function Upgrades
EA9AN: Supports only basic auxiliary contacts and shunt trips.
A9F94463: Supports full Acti9 accessory range:
Multi‑function auxiliary / alarm contacts
Remote‑control shunt trips
Over/undervoltage protection modules
Auto‑reclose accessories
Ti24 interface for PLC/BMS integration
3 Upgrade Decision Guide
Recommended to upgrade to A9F94463 if:
- Calculated short‑circuit current >6kA
- Critical facilities: industrial, large commercial, hospital, data center
- Future expansion needed (remote control, voltage monitoring, etc.)
- Limited panel space requires compact solution
- Higher reliability and longer service life required to reduce maintenance cost
Recommended to keep EA9AN4C63 if:
- Standard residential / small shop loads, short‑circuit ≤6kA
- Budget‑sensitive, cost priority
- Basic protection only, no complex accessories
- Already installed EA9 panel with matching system parameters
4 Replacement Notes
- Direct interchangeability: Both 4P C63A, DIN‑rail mount – direct replacement.
- Wiring check: A9F94463 neutral position matches EA9AN (left) – no need to reorder wiring.
- Derating: Both derate at >30°C (–1% per °C).
- Accessory compatibility: Existing EA9 accessories must be replaced with Acti9‑specific versions.
