Siemens NEG3B045L - 45 A, 3-Pole Circuit Breaker | AmpState

The Siemens NEG3B045L is a 45A, 3-pole molded case circuit breaker engineered to safeguard panelboards and loadcenters from overcurrent and short-circuit events. Built for reliable, long-lasting performance, this unit is a trusted choice for residential, commercial, and light industrial electrical protection.

Key benefits that set it apart

• Space-efficient design: Compact molded case construction makes efficient use of panel space, helping you fit protection where you need it without crowding the enclosure.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection by combining thermal sensing for gradual overloads with magnetic instantaneous tripping for sudden faults.
• Three-pole configuration: Provides synchronized disconnection of all conductors, essential for proper three‑phase protection in compatible panelboards.
• OEM-compatible: Designed to be used with matching OEM loadcenters and panelboards for a clean, reliable installation.
• Versatile application range: Ideal for branch circuit protection in residential settings, commercial spaces, and light industrial environments.

Technical specifications

• Manufacturer: Siemens
• Part Number: NEG3B045L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45A
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Residential panelboards needing compact, reliable three-pole protection for multi-wire circuits or three‑phase feeders in newer homes.
• Small to mid-sized commercial panels where space optimization is critical and dependable trip performance matters.
• Light industrial panels that require robust protection for multiple branch circuits feeding motors, lighting, and receptacle outlets.

Installation and compatibility considerations

Pair the NEG3B045L with matching OEM loadcenters and panelboards to ensure seamless fit and electrical coordination. As with all electrical installations, follow the local electrical codes and consult a licensed electrician to verify compatibility with your specific enclosure, bus arrangement, and wiring methods.

Incorporating the Siemens NEG3B045L into your protection scheme delivers dependable overcurrent and short-circuit protection, with a compact footprint and a trip mechanism designed for predictable performance across a range of applications.