Siemens HF323S - 100A, 250V, 3-Pole, Fusible, Safety Switch

The Siemens HF323S is a rugged, fusible safety switch designed to deliver reliable on/off isolation and overcurrent protection in demanding industrial and commercial environments. With a 100A rating, 250V operation, and a 3-pole configuration, it provides a compact, maintainable solution for critical electrical circuits that need both switching and protection in a single device.

• Model: HF323S
• Amperage: 100A
• Voltage: 250V
• Poles: 3-Pole
• Fused: Fusible design for integrated overcurrent protection

What sets the HF323S apart is its ability to combine safe, immediate isolation with overcurrent protection without adding extra components. The three-pole arrangement ensures complete three-phase disconnection, making it ideal for maintaining motor control circuits and protecting sensitive equipment in a single, space-efficient unit. Its compact, maintainable construction simplifies wiring, fuse maintenance, and servicing in crowded panels or equipment rooms.

• motor disconnects, panelboards, and branch circuit protection where a compact, maintainable fusible switch is required
• provides both disconnect capability and overcurrent safeguarding in one device
• engineered for demanding industrial and commercial environments, where dependable isolation matters most

Practical usage scenarios include shutting down a three-phase motor for maintenance without interrupting other circuits, protecting feeder lines in panel enclosures, and providing a safe, code-compliant disconnect point in control stations. When installing or servicing, replace fusible cartridges with the appropriate Siemens-approved fuses and ensure connections match the 250V, 100A, three-phase specifications to maintain optimal protection.

For engineers and technicians, the HF323S offers a straightforward, robust solution that reduces component count while delivering clear, reliable circuit protection. It’s a purpose-built choice for operators who need a dependable, space-conscious safety switch that won’t complicate maintenance or upgrade paths.