Schneider 32A 4 Pole MCB

Schneider Acti9 iC60N 32A 4-Pole Miniature Circuit Breaker (A9F74432)

The Schneider Electric Acti9 iC60N 4-Pole 32A Miniature Circuit Breaker (MPN: A9F74432) is an industrial-grade, multi-standard thermal-magnetic protection device engineered for low-voltage power distribution, critical process automation, and commercial/marine switchboards. Designed with 4 fully protected poles (4P / 4d), it provides simultaneous overload and short-circuit isolation across all three active phases and the neutral conductor in 3-phase, 4-wire (TN-S, TT, and IT) electrical networks.

Equipped with Schneider Electric’s proprietary VisiSafe™ (guaranteed green contact isolation flag for safe downstream maintenance conforming to IEC/EN 60947-2) and VisiTrip™ (mechanical red flag indicator on the front face for accelerated fault diagnosis), this breaker minimizes downtime in mission-critical environments. Its robust bimetallic thermal element handles operational ambient temperatures up to 70°C (with derating), while its tuned magnetic coil ensures rapid arc quenching through an integrated de-ionizing arc chute assembly.

Model Details

• Manufacturer: Schneider Electric
• Product Range: Acti9
• Product Model: iC60N
• Manufacturer Part Number (MPN): A9F74432 (C-Curve) / Alternate D-Curve MPN: A9F84432
• Legacy Cross-Reference / Predecessor Series: Multi9 C60N (MPN: 24355 / MG24355)

Key Technical Features

1. Complete 4-Pole Isolation & Protection: Fully synchronized 4-pole contact mechanism ensuring zero neutral floating and instantaneous 4P isolation under trip conditions.
2. VisiSafe™ & VisiTrip™ Ergonomics: Clear visible green strip confirms positive contact opening; active red mechanical shutter immediately flags fault trips versus manual switching.
3. High Impulse Withstand Capability: Rated impulse withstand voltage of 6 kV with Class 3 current limitation for superior protection against upstream transient surges and line switching spikes.
4. Bi-Connect Tunnel Terminals: Dual-entry cage clamp design accommodates rigid/flexible conductors and comb busbars simultaneously without terminal stress.

Equipment Compatibility

The Schneider Acti9 iC60N series integrates directly with standard 35 mm symmetrical top-hat DIN rails and is fully compatible with Acti9 system components:

• Add-on Residual Current Devices (RCD): Acti9 Vigi iC60 4P module (A9V41432 / 30mA, 300mA, 500mA variants).
• Auxiliary Indication Contacts: iOF (Open/Close Auxiliary Switch – A9A26924), iSD (Fault Signal Switch – A9A26927).
• Control & Tripping Units: iMN (Undervoltage Release), iMX / iMX+OF (Shunt Trip with Auxiliary Contact).
• Comb Busbars: Acti9 4-Pole 18 mm pitch copper distribution comb busbars (L1-L2-L3-N).
• Motor Operators & Accessories: Acti9 RCA remote control mechanism, Padlocking devices (A9A26970).

Industrial & Marine Applications

• Marine Switchboards & Outgoers: Main Switchboard (MSB) and Emergency Switchboard (ESB) 400V/440V distribution feeders on commercial vessels, OSVs, and offshore rigs.
• Marine Machinery & HVAC: Sea water cooling pumps, ventilation fans, galley heating loads, auxiliary air compressors, and localized distribution panels.
• 3-Phase Motor Feeder Circuits: Intermediate switching and inductive branch circuit protection for variable frequency drives (VFDs) and direct-on-line (DOL) motor starters.
• Uninterruptible Power Supplies (UPS): 4-pole isolation of input/output bypass circuits for clean neutral segregation.
• Industrial Automation Panels: PLC sub-panels, CNC machine control centers, and motor control centers (MCC).

Frequently Asked Questions

What is the difference between a 4-Pole (4P) MCB and a 3-Pole + Neutral (3P+N) MCB?

A true 4-Pole (4P) breaker like the Schneider A9F74432 contains independent thermal-magnetic trip mechanisms inside all four individual poles. A 3P+N device only provides overload and short-circuit protection across the three live phases, while its neutral pole is merely an uncalibrated mechanical switch without a protection coil. 4P breakers are mandatory on installations with non-linear loads or ungrounded IT marine electrical systems.

Can the Schneider Acti9 iC60N 32A breaker be used in direct current (DC) circuits?

Yes. The Acti9 iC60N is rated for DC applications up to 250V DC when poles are connected according to Schneider Electric DC wiring configurations. Short-circuit breaking capacities in DC systems vary based on voltage and the series wiring configuration of the 4 poles.

Does the Acti9 iC60N directly replace obsolete Merlin Gerin Multi9 C60N breakers?

Yes. The Acti9 iC60N series is the direct form, fit, and functional replacement for the discontinued Merlin Gerin Multi9 C60N 4P series. It mounts to the identical standard 35 mm DIN rail and aligns seamlessly with existing enclosure depth clearances.

What is the maximum cable size accepted by the 32A iC60N terminals?

The top and bottom cage clamp terminals accept solid rigid copper conductors up to 35 mm² and flexible ferruled copper cables up to 25 mm².