SIEMENS
SIEMENS HNF263R Safety Switch 100 A 600 V 2PST
Heavy-duty safety switch rated 100 A at 600 V with a 2PST contact form for indoor or outdoor surface mounting
- Heavy-duty construction withstands tough environments
- 100 A rating handles high-current loads safely
- 600 V capacity supports industrial power systems
- NEMA 3R enclosure protects against rain and sleet
- 75 hp at 240 V AC drives large motors
Industrial Safety Switch for Heavy-Duty Motor
The Siemens HNF263R is a non-fusible, heavy-duty safety switch rated at 100 A and 600 V. It uses a 2PST contact form to isolate power for industrial machinery and motor circuits. The NEMA 3R steel enclosure suits indoor or outdoor surface mounting. It is built for demanding environments where reliable manual disconnect is required.
Thermal and Power Characteristics in Service
The switch carries a continuous current rating of 100 A at up to 600 V AC. It supports motor loads of 75 hp at 240 V AC and 40 hp at 600 V AC. The IP14 rating protects internal contacts from splashing water and solid objects. As a passive mechanical device, it generates no operational noise or heat beyond normal conduction losses.
Enclosure and Mounting Features
The steel housing measures 23 1/8 in height and 8 1/4 in depth, providing a robust barrier for the contacts. A NEMA 3R rating allows installation in outdoor locations exposed to rain or sleet. The surface-mount design simplifies attachment to walls or equipment frames. No neutral assembly is included, so the installer must provide one if the circuit requires it.
Highlights
- Heavy-duty construction withstands tough environments
- 100 A rating handles high-current loads safely
- 600 V capacity supports industrial power systems
- NEMA 3R enclosure protects against rain and sleet
- 75 hp at 240 V AC drives large motors
Specifications
| Brand | SIEMENS |
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Questions about this item
How is the surface-mount enclosure secured, and what step do installers often miss?
Mount the steel enclosure with four lag bolts through the back-panel slots; the step often missed is torquing each bolt to the manufacturer value so the NEMA 3R seal stays intact.
Which components need periodic inspection or replacement after extended service?
Inspect the contact blades and operating mechanism annually; replace the switch if contact resistance rises or the handle mechanism shows wear.
What is the first thermal or duty-cycle limit reached during continuous 100 A operation?
The 100 A continuous rating in a 3R enclosure is the limiting factor; sustained loads above 100 A will cause temperature rise beyond the heavy-duty design.
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