Description
The Siemens HF321S is a heavy-duty fusible safety switch from the VBII series, rated at 30A and 240V. Built with a NEMA 4X stainless steel enclosure, it provides secure disconnecting means for service entrances and load applications in both indoor and outdoor environments.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Siemens |
| Category |
Safety Switches |
| Part Number |
HF321S |
| Subcategory |
Heavy-Duty Fusible Safety Switch |
| Series |
VBII |
| Frame Type |
HF |
| Voltage Rating |
240 VAC / 250 VDC |
| Amperage Rating |
30 A |
| Poles |
3 |
| Phase |
3 |
| Duty Rating |
Heavy Duty |
| Protection Method |
Fusible |
| Fuse Class |
Class H (optional Class R kit HRK4060) |
| Contact Configuration |
3PST (3-Pole Single Throw) |
| Interrupting Rating |
200 kAIC @ 240V |
| Enclosure Type |
NEMA 4 / 4X, IP66 |
| Material |
304 Stainless Steel (18-8 grade) |
| Housing Material |
Metallic |
| Mounting Type |
Surface / Panel Mount |
| Terminal Connection |
Lugs |
| Neutral Assembly |
Included |
| Horsepower Rating |
7.5 HP @ 240 VAC |
| Environment |
Indoor/Outdoor, corrosion resistant |
| Dimensions (H x W x D) |
15.5" x 9.0" x 8.5" |
| Standards |
UL Listed |
| Weight |
23 lbs |
Information About HF321S
The Siemens HF321S is a rugged safety switch engineered for reliable operation in demanding environments. With a 30A rating and support for 240V AC or 250V DC, it provides dependable overcurrent protection using Class H fuses, with an option for Class R fuses via a kit. Constructed from 304 stainless steel, this unit meets NEMA 4X standards, ensuring resistance to corrosion and harsh weather, making it suitable for indoor and outdoor use. Designed for heavy-duty applications, it offers secure disconnecting means for service entrances and load circuits in industrial, commercial, and utility installations.
Key Features:
- Heavy-Duty Rating: Supports 30A continuous duty at 240V, providing reliable performance in demanding applications.
- Fusible Protection: Designed for Class H fuses with optional Class R conversion for enhanced protection.
- Three-Pole, Three-Phase Design: Provides safe disconnecting capability across three-phase electrical systems.
- High Interrupting Rating: Rated for 200 kAIC at 240V, ensuring strong fault current clearing capacity.
- Stainless Steel Construction: Built from 304-grade stainless steel, offering corrosion resistance for long service life.
- NEMA 4X Enclosure: Ensures watertight, dust-tight, and corrosion-resistant protection suitable for harsh environments.
- Surface Mounting: Simplifies installation on panels or walls, ensuring a secure fit.
- Neutral Assembly Included: Facilitates reliable grounding and circuit continuity.
- Horsepower Rating: Supports motor loads up to 7.5 HP at 240V AC.
- Compliance: UL listed and designed to meet stringent safety standards for industrial installations.
The HF321S delivers the reliability and precision required for heavy-duty disconnecting and circuit protection, particularly in environments where corrosion resistance and durability are essential.
