Siemens NGG3B040L - 40 A, 600 V, 3-Pole Circuit Breaker | AmpState

Siemens NGG3B040L is a 40A, 600V, 3-pole molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Its compact design frees up valuable panel space, while delivering precise protection for a wide range of electrical installations.

What sets this breaker apart

• Compact molded case design maximizes panel efficiency by fitting neatly into tight spaces without sacrificing performance.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining a thermal element for gradual overloads with a magnetic element for fast short-circuit response.
• OEM compatibility designed to pair with matching Siemens load centers and panelboards for seamless installation and reliable operation.
• Versatility across environments ideal for residential, commercial, and light industrial applications—where dependable protection matters most.

Why this protects your system

With a 40A rating at up to 600V across three poles, the NGG3B040L guards multi-wire branch circuits against overcurrent and short circuits. The dual-action trip mechanism reduces nuisance events while ensuring rapid interruption during faults, helping shield conductors, devices, and wiring from damage.

Practical use cases

• Upgrading or replacing breakers in Siemens OEM panelboards to restore precise protection and panel integrity.
• Installing in new panel projects where space efficiency and reliable trip performance are priorities.
• Applications spanning residential subpanels, small commercial distributions, and light industrial circuits.

Key specifications

• Manufacturer: Siemens
• Part Number: NGG3B040L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 600V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection