Siemens hfb21 Safety Switch Line Base 30A 240V

Product Description

The SIEMENS hfb21 is a VBII safety switch replacement line base designed for heavy-duty fusible safety switch assemblies. It provides the line-side mounting foundation for fused disconnect applications and is rated at 30 amps and 240 volts. The unit is UL Listed and accommodates 2 or 3 pole configurations, making it a flexible component for single-phase and three-phase service installations. Included lugs support direct conductor termination without the need for additional hardware. Licensed electricians and qualified service technicians typically handle this type of replacement work in both new construction and retrofit scenarios.

This line base is intended for use in heavy-duty fusible safety switch enclosures within the Siemens VBII product family. It is suited for residential and light commercial electrical systems where a fused disconnect is required at the service entrance, HVAC equipment, or branch circuit isolation points. The part addresses field replacement needs when the original line base is damaged or worn, avoiding full enclosure replacement.

Key Features

• Rated 30 amps at 240 volts for heavy-duty fusible switch applications
• Compatible with 2 or 3 pole configurations to support single-phase and three-phase installations
• Includes lugs for direct conductor termination at the line side
• UL Listed for compliance with standard electrical safety requirements
• OEM-style replacement part for Siemens VBII safety switch enclosures

Compatibility

Designed as an OEM-style replacement line base for Siemens VBII series heavy-duty fusible safety switch enclosures rated at 30A and 240V.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC). Always de-energize and lock out the circuit at the upstream overcurrent device before removing or installing any safety switch component. Verify that conductor size and lug torque requirements conform to the markings on the assembly and applicable NEC requirements. Do not reinstall a damaged or corroded line base.

Technical Specifications

• Voltage: 240 volts
• Amperage: 30 amps
• Pole Configuration: 2 or 3 pole
• Switch Type: Fusible
• Component Type: Line Base
• Certifications: UL Listed

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: hfb21