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Schneider Electric A9S4P100

The Schneider Electric A9S4P100 is a high-performance 4-Pole Switch Disconnector from the renowned Acti9 iSW series, engineered for heavy-duty 100A load management. Manufactured in France, this 415V thermoplastic-housed component provides critical physical isolation for 3-phase plus Neutral circuits. Unlike standard breakers, the A9S4P100 is a dedicated manual isolator designed to safely disconnect power under load, making it an essential primary incomer for industrial panels and large-scale distribution boards.

Quick Answer

The A9S4P100 is a 100A 4-pole manual isolator used as a main switch to disconnect power to 3-phase + Neutral circuits. It is rated for AC-23A (heavy inductive loads) but does not provide overcurrent protection.

✓100A Continuous Current Rating for high-demand circuits
✓4-Pole Configuration (3P+N) for total system isolation
✓AC-23A Utilization Category for switching motors and inductive loads
✓High-durability Thermoplastic Housing with IP40 Protection
✓Seamless DIN Rail mounting within the Acti9 ecosystem

You should choose the Schneider Electric A9S4P100 if you require a reliable, 100A-rated master isolation switch for a 3-phase system that demands the highest build quality and neutral-path isolation without the need for integrated fuse/trip protection.

✓ Who Should Buy

  • •Industrial panel builders needing a 100A 4-pole incomer.
  • •Maintenance managers looking for a robust local isolator for 3-phase motors.
  • •Electrical contractors installing high-capacity 415V distribution boards.

✕ Who Should Avoid

  • •Users looking for a device that trips during a short circuit (this is not a breaker).
  • •Small residential single-phase applications where 100A capacity is excessive.
Product Overview
The A9S4P100 belongs to the Acti9 iSW range, representing the gold standard in modular switch-disconnectors. This model is specifically tailored for 415V electrical networks where reliable, manual control is required to isolate sub-panels or machinery. Because it utilizes the AC-23A category, it is significantly more robust than basic switches, capable of handling the high inrush currents and arcing associated with heavy-duty inductive equipment like industrial fans or cooling systems. Designed with safety in mind, the unit features a clear manual toggle that ensures a positive break in the electrical path. Its 4-pole design is particularly important in installations where the neutral must be disconnected simultaneously with the phases to prevent circulating currents or to meet local safety regulations for total isolation during maintenance. The compact modular width allows it to fit perfectly alongside other Acti9 breakers on a standard DIN rail.

BrandSchneider Electric
Model NameA9S4P100
TypeMain Switch Disconnector
SeriesActi9 iSW
Housing MaterialThermoplastic
Country Of OriginFrance
Release Year2010

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Engineering Analysis
The A9S4P100 utilizes a 'non-automatic' switching architecture, meaning it lacks a bimetallic strip or magnetic coil for tripping. This makes it a 'Pure Disconnector.' Its internal contacts are silver-alloy tipped to resist welding during load switching. The AC-23A rating is the most critical engineering spec here; it indicates the device can handle 'frequent switching' of highly inductive loads without mechanical failure. The screw terminals are designed with deep cages to accept large cross-section copper cables (up to 50mm²), ensuring the 100A current flow does not cause localized overheating at the connection points.

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