Description
The Siemens NEB3B040 is a 3-pole molded case circuit breaker designed for branch and feeder circuit protection in industrial power distribution systems. Rated at 40 A with a maximum operating voltage of 600 V, it features thermal-magnetic protection and an interrupting capacity of 35 kA at 480 V. The breaker uses a bolt-on connection style, allowing secure installation within compatible Siemens panelboards and switchgear.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Siemens |
| Category |
Circuit Protection |
| Part Number |
NEB3B040 |
| Subcategory |
Molded Case Circuit Breakers |
| Breaker Type |
Molded Case Circuit Breaker (MCCB) |
| Series / Type |
NEB |
| Number of Poles |
3 Pole |
| Phase |
3 Phase |
| Rated Current |
40 A |
| Rated Voltage |
600 V AC |
| Interrupting Capacity |
35 kA at 480 V |
| Protection Type |
Thermal Magnetic |
| Trip Functions |
LI – Long-Time and Instantaneous |
| Connection Type |
Bolt-On |
| Application |
Industrial and commercial power distribution |
| Weight |
3 lb |
Information About NEB3B040
The NEB3B040 is part of the Siemens NEB series molded case circuit breakers engineered for dependable protection of electrical distribution circuits. It incorporates thermal-magnetic trip technology that combines long-time overload protection with instantaneous short-circuit interruption. The breaker is configured with three poles for use in three-phase power systems commonly found in industrial and commercial facilities. With its bolt-on mounting design and high interrupting capacity, the device integrates easily into distribution panels while ensuring reliable protection for electrical equipment and wiring.
Key Features:
- 40 Amp Current Rating: Designed to protect branch and feeder circuits carrying up to 40 A.
- 3-Pole Configuration: Suitable for three-phase power distribution systems.
- Thermal-Magnetic Trip Unit: Provides long-time overload protection and instantaneous short-circuit response.
- LI Protection Functions: Includes long-time and instantaneous protection modes.
- 35 kA Interrupting Capacity: Rated for 35 kA AIC at 480 V for high fault interruption capability.
- 600 V Voltage Rating: Suitable for medium-voltage low-voltage distribution networks.
- Bolt-On Mounting Style: Ensures secure mechanical and electrical connection in Siemens panelboards.
- NEB Series Breaker Design: Built for compatibility with Siemens distribution equipment.
- Industrial Circuit Protection: Used for protecting motors, feeders, and distribution circuits.
The NEB3B040 delivers the reliability and precision required for branch circuit protection and fault interruption in industrial electrical distribution systems.
