Siemens HF365RA 400A 3P 600V Safety Switch, NEMA 3R, Fusible | AmpState

The Siemens HF365RA is a purpose-built safety switch designed for reliable equipment disconnect and isolation at the point of use. With a 400A, 3-pole configuration and a 600V rating, this fusible switch is tailor-made for maintenance teams, panel builders, and spare inventories where exact part-number matching matters for fast, predictable service.

Key features at a glance

• Current rating: 400 A
• Poles: 3
• Voltage: 600 V
• Enclosure: NEMA 3R for versatile indoor/outdoor protection
• Type: Fusible safety switch for built-in overcurrent protection
• Brand and compatibility: Siemens HF365RA, a direct part-number match for streamlined replacements

Why this safety switch stands out

Unlike generic disconnects, the HF365RA is engineered for consistent performance in everyday electrical work. The NEMA 3R enclosure provides weather-resistant protection, so you can rely on safe operation in outdoor or challenging environments. The fusible design means you benefit from integrated overcurrent protection at the point of use, reducing the number of separate components you must source and stock. This translates to quicker maintenance shutoffs, safer service windows, and less downtime when servicing equipment.

Ideal use cases

• Directly isolate critical equipment during maintenance without powering down entire systems
• In panel construction and electrical assemblies where a dependable fused disconnect is required
• Spare inventory for service fleets to guarantee a precise, in-date part-number match
• Outdoor or semi-enclosed installations needing rugged weather protection and reliable disconnection

Practical benefits and outcomes

With the HF365RA, you gain a predictable, field-ready solution that simplifies compliance and safety checks. The three-pole configuration ensures coordinated disconnection across all phases, while the fusion-capable design provides overcurrent protection at the disconnect point. This minimizes fault propagation and enhances crew safety during maintenance, testing, or emergency shutdowns.

Specifications and fit

Part Number: HF365RA

Type: Safety Switch (Fusible)

Amperage: 400 A

Poles: 3

Voltage: 600 V

Enclosure rating: NEMA 3R

Additional notes

Available from AmpState. If you need help matching a part number or confirming compatibility, message us and we’ll help you confirm fit. This HF365RA is purpose-built for installations where a direct part-number match matters, delivering dependable performance and streamlined maintenance logistics.