Description
The Siemens® HF366RA is a VBII Series heavy-duty fusible safety switch designed for secure disconnection and overcurrent protection in industrial and commercial power systems. This 3-pole, 600A, 600VAC switch is enclosed in a NEMA 3R outdoor-rated steel housing, providing reliable operation and durability in demanding environments. With a visible-blade, double-break mechanism, it ensures safe isolation of electrical circuits while maintaining superior performance and safety standards.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Siemens |
| Category |
Switches |
| Part Number |
HF366RA |
| Subcategory |
Heavy-Duty Safety Switch |
| Series |
VBII |
| Type |
HF (Fused, Heavy-Duty) |
| Number of Poles |
3 |
| Phase |
3-Phase |
| Voltage Rating |
600 VAC |
| Amperage Rating |
600 A |
| Frequency |
60 Hz |
| Interrupting Rating |
200 kA @ 600V (with Class R fuses) |
| Horsepower Rating |
200 HP |
| Mounting Type |
Surface mount |
| Enclosure Type |
NEMA 3R (Outdoor) |
| Material |
Steel |
| Operating Mechanism |
Quick-make, quick-break visible blade |
| Handle Type |
Red padlockable handle (up to 3 padlocks, 5/16" hasps) |
| Safety Features |
Dual cover interlock, visible blade, arc chutes |
| Terminal Type |
Lug connections |
| Operating Temperature Range |
-29°C to +85°C |
| Wire Bending Space |
Meets/exceeds NEC requirements |
| Dimensions (H × W × D) |
56.07 × 26 × 14.68 in |
| Alternate Dimensions (mm) |
1424 × 660 × 373 mm |
| Weight |
99.8 lbs (45.3 kg) |
Information About HF366RA
The HF366RA is part of Siemens’ VBII Series of heavy-duty disconnect switches, engineered for high-performance switching and circuit protection. Designed for three-phase, 60 Hz systems, this fused switch accommodates three Class R fuses and delivers a maximum interrupting capacity of 200 kA at 600V. The visible blade design ensures clear verification of contact separation, while the quick-make, quick-break mechanism guarantees fast and positive switching. Featuring a defeatable dual cover interlock, padlock provisions, and a hook-stick operable red handle, the HF366RA prioritizes operator safety and compliance with NEC wire-bending space requirements. Suitable for both indoor and outdoor use, it is ideal for motor disconnects, service entrance applications, and industrial control systems.
Key Features:
- Heavy-Duty Construction: Type VBII switch built for demanding industrial and commercial environments.
- High Current Rating: 600A, 600VAC for large-scale electrical distribution systems.
- Visible Blade Design: Provides visual confirmation of contact separation for maximum operator safety.
- Double-Break Switching Action: Ensures reliable circuit interruption and extended switch life.
- NEMA 3R Enclosure: Outdoor-rated steel housing protects against dust, rain, and corrosion.
- Quick-Make, Quick-Break Mechanism: Guarantees fast, positive on/off operation under load.
- Padlockable Handle: Accommodates up to three padlocks for secure lockout/tagout compliance.
- Arc Chute Assembly: Efficiently dissipates heat during switching to enhance component longevity.
- Compliant Design: Meets or exceeds NEC wire-bending and clearance requirements.
The HF366RA delivers the safety, durability, and reliability required for critical disconnection and protection in industrial power systems.
