SCHNEIDER iC65N-2P-C25A Miniature Circuit Breaker

Technical Specifications & Application Guide

This is a 2‑pole, Type C, 25A miniature circuit breaker (MCB) from Schneider Electric’s Acti9 series, with order code A9F18225 and rated breaking capacity 6kA.

It provides overload and short‑circuit protection for lighting, socket, and small motor circuits in AC distribution systems.

Features include 3‑stage current limiting, quick make mechanism, and protection degree IP40 (front) / IP20 (terminals).

It is compatible with iC65 series accessories for functional expansion.

1. Model Breakdown

2. Core Specifications

3. Features
4. Protection performance

3‑stage current limiting: Quickly limits peak current during short circuit, reduces thermal stress, protects equipment and cables.

Selective protection: Coordinates with upstream breakers for selective tripping, limits fault area.

Fault indication: Red window shows tripped status for quick diagnosis.

2. Structural advantages

Dual‑lock clip: Secures firmly on DIN rail, prevents vibration loosening.

Quick make mechanism: Improves closing speed, reduces arcing, extends life.

Modular design: Accepts auxiliary contacts, alarm contacts, shunt trip, undervoltage trip, etc.

3. Safety design

Isolation function: Safe isolation distance in OFF position, meets electrical safety rules.

Anti‑misoperation: Handle design prevents accidental closing.

Flame‑retardant housing: V0 grade material improves cabinet safety.

4. Installation & Maintenance

Installation Rules

1. Mount vertically (±15°) for proper tripping.
2. Wiring: Copper 1.5~35mm², Aluminium 2.5~35mm², torque 1.2~4N·m (depends on cross‑section).
3. Environment: Avoid damp, dusty, corrosive or high‑vibration locations.
4. Spacing: Maintain clearance for heat dissipation; follow installation manual.

Maintenance Guide

Troubleshooting

1. Frequent tripping: Check overload → short circuit → high ambient temperature → aging.
2. Cannot close: Check short circuit → handle position → trip reset → loose wiring.
3. Overheating: Check terminal torque → overload → ventilation.
4. Upgrade & Replacement

5.1 Same‑series Upgrades

iC65H-2P-C25A (A9F28225): H‑type, 10kA, for higher short‑circuit current.

iC65L-2P-C25A (A9F38225): L‑type, 15kA, for heavy industrial use.

iC65N-2P-C25A‑Vigi (A9V58225): With residual current protection (RCCB), prevents electric shock.

5.2 Functional Accessories

5.3 Cross‑series Alternatives

6. Applications
7. Commercial buildings: Offices, shops, hotels – lighting & socket circuits.
8. Industrial automation: Control panels, small motors (≤5.5kW), VFD input protection.
9. Residential: Home distribution – air conditioners, kitchen appliances.
10. Public facilities: Schools, hospitals, stadiums – electrical safety.
11. Selection & Purchasing Tips
12. Load matching: Type C for lighting, sockets, small motors (≤5.5kW). Use Type B for pure resistive, Type D for large motors.
13. Breaking capacity: Choose N (6kA), H (10kA), L (15kA) based on system short‑circuit current.
14. Poles: 2P for 230V single‑phase where phase + neutral must be disconnected.
15. Accessories: Add aux, shunt, undervoltage for smart systems.
16. Authenticity: Buy from authorized Schneider distributors.
17. Quick Fault Guide

SCHNEIDER iC65N-2P-C25A

Cross‑Brand Replacement Guide

Core Summary: The iC65N-2P-C25A (A9F18225) can be directly replaced by equivalent MCBs from major international and domestic brands.

Key matching requirements:

2P, Type C, 25A, 6kA, 35mm DIN rail mounting.

1. International Brand Direct Replacements

ABB

Siemens

Eaton

Moeller

2. Chinese Domestic Brands

3. Critical Parameter Matching

4. Replacement Notes & Best Practice

Before Replacement

System short‑circuit current ≤ breaking capacity of replacement.

35mm DIN rail, space, terminal size compatible.

Protection coordination with upstream/downstream devices.

Accessory mounting interface compatible.

Replacement has valid certifications (CCC, CE).

Procedure

1. Power off and verify voltage absence.
2. Remove wiring and old breaker.
3. Clip replacement onto DIN rail.
4. Torque terminals correctly.
5. Test ON/OFF and tripping.
6. Update labeling and drawings.

When NOT to replace

Original uses dedicated Schneider accessories (e.g., Vigi modules).

System short‑circuit current exceeds replacement rating.

Load inrush >10In (unsuitable for Type C).

Extreme environment outside replacement specs.

5. Recommended Replacement Levels

6. Common Issues & Solutions

Cross‑brand replacement for SCHNEIDER iC65N-2P-C25A depends on parameter matching + mechanical compatibility + protection coordination.

Top international brands (ABB, Siemens) give identical performance.

Domestic brands (CHINT, DELIXI) offer cost savings.

Always verify specifications and follow electrical safety standards.