Description
Built to satisfy demanding commercial and industrial installation standards, the Square D SE125SW4 ensures simultaneous switching and full isolation across all three phases plus the neutral line ($4\text{P}$ protection).
Key Features & Benefits
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Dual Part Number Compatibility: Cross-compatible reference covering both the traditional Square D SE125SW4 designation and the modern Acti9 A9S66492 stock code.
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Simultaneous 4-Pole Isolation: Disconnects all three phase lines and the neutral line at the exact same moment, preventing dangerous floating neutral conditions and ensuring absolute safety during panel shutdowns.
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Heavy-Duty 125A Continuous Rating: Purpose-built to handle high-amperage mainline power distribution loops and heavy industrial machinery control circuits.
Specifications at a Glance
| Feature | Details |
| Manufacturer / Brand | Schneider Electric (Square D / Merlin Gerin) |
| Product Range | Acti9 iSW / Square D Isobar Series |
| Product Type | Switch Disconnector / Isolator |
| Product Code / SKU | SE125SW4 / A9S66492 |
| Condition | New/Old or Used Stock (Full Working Condition) |
| Number of Poles | 4-Pole (4P) |
| Current Rating ($I_e$) | 125A |
| Utilization Category | AC-22A / AC-23A |
| Short-Circuit Withstand ($I_{cm}$) | 5kA (conditional short-circuit current with upstream MCB) |
| Operating Voltage ($U_e$) | 415V AC |
| Standards Compliance | BS EN 60947-3 / EN 60947-3 |
