Siemens NGG2B040L - 40 A, 600 V, 2-Pole Circuit Breaker | AmpState

Engineered for dependable protection in modern electrical distributions, the Siemens NGG2B040L is a 40A, 600V, 2-pole molded case circuit breaker designed to deliver precise, reliable branch circuit protection in panelboards and load centers. This device is built to pair seamlessly with Siemens OEM panel systems, ensuring a cohesive, code-compliant protection scheme from the first install.

Why this breaker stands out

• Compact molded case design maximizes panel space, letting you fit more circuits in tight panel allocations without sacrificing protection or performance.
• Thermal-magnetic trip unit provides stable, repeatable protection across a range of loads and temperatures—delivering reliable overload protection with fast magnetic response for short-circuit events.
• OEM compatibility is built in: designed to work with matching Siemens load centers and panelboards for coordinated protection, easier replacements, and streamlined maintenance.
• Versatility for multiple environments — ideal for residential, commercial, and light industrial applications that demand dependable, code-compliant overcurrent protection.

Technical snapshot

• Manufacturer: Siemens
• Part Number: NGG2B040L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 600V
• Number of Poles: 2
• Application: Branch circuit overcurrent and short-circuit protection

What problems this breaker solves

• Prevents electrical fires and equipment damage by interrupting faults quickly and reliably.
• Minimizes nuisance trips through precise thermal-magnetic coordination, keeping circuits active when loads fluctuate modestly.
• Eliminates guesswork during replacement by guaranteeing a proper fit within Siemens panel ecosystems.

Ideal for

• Electricians and facility managers configuring new panelboards or upgrading existing systems.
• Residential electrical panels needing compact yet robust 2-pole protection.
• Commercial and light industrial installations where space efficiency and dependable short-circuit protection are priorities.

Use cases and practical tips

• Use as the main or branch circuit protection in Siemens-approved panelboards and load centers to ensure proper trip coordination and electrical safety.
• Pair with compatible conductors and adhere to local codes for safe installation in both new builds and retrofit projects.
• During installation, verify the panel is rated for 600V service and follow standard torque specifications for secure terminal connections.
• Keep a spare NGG2B040L on hand for quick replacements in service panels, reducing downtime and service interruptions.

With the Siemens NGG2B040L, you invest in a rugged, space-efficient, and precisely coordinated protection solution that fits cleanly into your Siemens panel ecosystem. It’s the smart choice when you need dependable 40-amp, 2-pole protection for a wide range of panelboard and load center configurations.