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Schneider Electric A9KS15440BQ

The Schneider Electric A9KS15440BQ is a high-performance Acti9 iSW-NA series 4-pole switch disconnector engineered for definitive electrical isolation in 3-phase and neutral (3P+N) configurations. Rated at 40A and 415V, this French-engineered component is a non-automatic switch designed for heavy-duty commercial and industrial environments. It provides a visible break for maintenance safety, ensuring that downstream circuits are fully de-energized without the complexity of integrated trip units.

Quick Answer

The A9KS15440BQ is best used as a master isolation switch in 415V 3-phase electrical panels. It is compatible with all standard 35mm DIN rail mounting systems and is ideal for disconnecting motor circuits or sub-distribution boards.

✓40A Rated Operational Current for robust power handling
✓4-Pole (3-Phase + Neutral) configuration for complete circuit isolation
✓AC-23A Utilization Category suitable for highly inductive loads
✓IP40 Rated Thermoplastic Housing for superior durability and safety
✓Acti9 iSW-NA Series Engineering with positive contact indication

Investors in electrical infrastructure should choose the Schneider A9KS15440BQ for its uncompromising build quality and 'Safety-First' design. If your 3-phase system requires a dedicated 40A manual isolator with a 4-pole configuration for safe maintenance, this model is the industry standard.

✓ Who Should Buy

  • •Panel builders requiring a high-quality 4P disconnector for 3-phase industrial boards.
  • •Facility managers overseeing commercial HVAC or motor control centers.
  • •Electrical contractors installing sub-panels that require independent isolation from the main supply.

✕ Who Should Avoid

  • •Users looking for a device with integrated short-circuit or overload protection (this is a switch, not a breaker).
  • •Residential applications involving only single-phase circuits where a 2-pole switch is more cost-effective.
Product Overview
Designed by Schneider Electric, the A9KS15440BQ belongs to the renowned Acti9 range, specifically the iSW-NA sub-series. This 40A switch disconnector is purpose-built for the control and isolation of electrical circuits. Unlike standard switches, this model is rated for AC-23A, meaning it can safely handle the switching of motors or other highly inductive loads, making it a versatile choice for industrial control panels and HVAC systems. The unit features a rotary-style operation mechanism that provides clear tactile feedback to the user. Its compact DIN rail design allows for easy integration into modular distribution boards. As a dedicated disconnector, it focuses on high mechanical endurance and reliable contact separation, meeting international standards for isolation functions in low-voltage installations.

BrandSchneider Electric
Model NameA9KS15440BQ
TypeMain Switch Disconnector
SeriesActi9 iSW-NA
Housing MaterialThermoplastic
Country Of OriginFrance
Release Year2012

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Engineering Analysis
From an engineering perspective, the A9KS15440BQ utilizes high-torque screw terminals that ensure low contact resistance and prevent overheating at the full 40A load. The internal contact geometry is optimized for the AC-23A category, allowing it to break current even under stalled motor conditions. The positive contact indication (PCI) ensures that the handle position cannot show 'OFF' unless the contacts are physically separated by the required safety distance, an essential feature for compliance with industrial safety protocols.

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