Siemens LGB3B020B 20A 3P 480V Circuit Breaker, Bolt-On | AmpState

The Siemens LGB3B020B is a rugged 3-pole, 20 A circuit breaker engineered for reliable everyday protection in panelboards, load centers, and electrical distribution systems. With a 480 V rating, this bolt-on unit is designed to stand up to demanding industrial and commercial environments, keeping your power distribution safe and compliant.

Key advantages that set the LGB3B020B apart

• Bolt-On mounting enables quick, secure installation and fast replacements, minimizing downtime during service and upgrades.
• Three-pole configuration provides balanced protection for three-phase circuits, ensuring uniform current interruption across all legs.
• 480 V operation supports modern commercial and industrial distributions, aligning with typical facility voltage standards.
• 20 A rating suits general protection needs in many electrical feeds without unnecessary tripping in normal operation.
• Original BOM alignment is preserved, making it ideal for replacement projects where exact part numbers are required to maintain documentation and spare stocking accuracy.
• Trusted Siemens quality backed by AmpState availability for genuine, compatible components.

Ideal use cases

• Replacement projects in existing Siemens-equipped panelboards and load centers, where a like-for-like part is essential for performance and documentation.
• Stocking spares to keep facility maintenance on schedule and ensure BOM continuity with the original equipment.
• Three-phase electrical distribution in commercial buildings, manufacturing spaces, and data-center environments where reliable overcurrent protection is critical.
• Upgrading or maintaining electrical distribution without disrupting existing protection schemes.

Need help matching a part number or confirming compatibility? Message us, and AmpState will help you verify the fit.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: LGB3B020B
• Type: Circuit Breaker
• Amperage: 20 A
• Poles: 3
• Voltage: 480 V
• Mounting: Bolt-On

Availability: Available from AmpState. If you’re aligning the BOM to the original part number or stocking spare units to reduce downtime, this LGB3B020B brings dependable protection and straightforward replacement paths to your electrical distribution kit.