Siemens HBB21 Disconnect Switch, 30A, 3-Pole, 240V

The Siemens HBB21 Disconnect Switch is engineered for industrial electrical work, delivering dependable isolation for 3‑phase systems. With a rating of 30 A, 3 poles, and a 240 V operating voltage, this unit is built for service, maintenance, and replacement projects where fast, safe disconnection matters. Before ordering, verify fit by part number to ensure compatibility with your equipment and enclosure. If you need help matching a part number to your application, our team can assist in confirming the right fit.

What makes the HBB21 stand out

This disconnect switch uses a dedicated 3‑pole design to fully isolate all conductors on a three‑phase circuit, simplifying safe work procedures and reducing downtime during maintenance or upgrades. Designed with industrial environments in mind, the HBB21 provides a reliable, straightforward solution for keeping your operations safe and productive when electrical service needs to be interrupted for servicing.

Key specifications

• Amperage: 30 A
• Poles: 3
• Voltage: 240 V
• Part number: HBB21

Ideal applications

• Shutting down three‑phase equipment for safe maintenance, repairs, or upgrades
• Temporary isolation during component swaps or panel work
• Routine service and preventive maintenance in manufacturing, processing, and industrial facilities

Who should consider this

Maintenance teams, electrical contractors, and plant engineers who need a reliable, industry‑grade disconnect switch to manage 3‑phase circuits at 240V. The HBB21 is a practical choice when uptime, safety, and straightforward installation are priorities.

Practical setup tips

• Confirm the part number (HBB21) matches your application requirements and enclosure compatibility.
• Follow your site’s lockout/tagout procedures before performing any isolation work.
• Align the switch with your electrical schematics to ensure it controls the intended circuit.

Designed to integrate seamlessly into industrial electrical service workflows, the HBB21 supports maintenance schedules and replacement projects with a clear, reliable path to safe circuit isolation. If you have questions about fit or how this 240V, 3‑pole disconnect switch fits your system, we’re glad to help verify compatibility and get you to a confident purchase.