Siemens NGG2B090L - 90 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens NGG2B090L is a 90A, 600V, 2-pole bolt-on molded case circuit breaker designed to deliver reliable branch-circuit protection in panelboards and load centers.

Built for durability in environments subject to vibration, this unit features a secure bolt-on mounting that creates a rigid bus connection, reducing movement and wear over time. The thermal-magnetic trip unit provides stable, repeatable protection performance by combining thermal overload sensing with magnetic short-circuit tripping for fast response to faults.

Designed for seamless compatibility, NGG2B090L is intended to work with matching OEM load centers and panelboards, enabling straightforward replacement or upgrades without custom adapters. It's suitable for residential, commercial, and light industrial applications where dependable overcurrent protection is essential.

Key specifications

• Amperage rating: 90 A
• Voltage rating: 600 V
• Poles: 2
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Manufacturer: Siemens
• Part number: NGG2B090L
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and scenarios

• Upgrading a panelboard or load center in a home or small business where 90 A protection is required on a specific branch circuit or feeder
• Replacing an aging or failed breaker with a like-for-like Siemens NGG2B090L for reliable, field-proven performance
• Installing in new construction where a robust, bolt-on MCCB provides a solid, vibration-resistant connection in electrical closets or service rooms

Why this matters

• The bolt-on design minimizes looseness and arcing risk on bus connections in environments with vibration or movement
• The thermal-magnetic trip curve offers dependable protection across a range of loads and temperatures, reducing nuisance trips and protecting wiring and equipment
• OEM compatibility means faster installations and fewer mismatches with existing Siemens panelboards and load centers