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Feels well-built and suitable for everyday plant and maintenance use.
Facilities · Manufacturing
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circuit-breaker
Siemens NEB3B040B 40A 3P 600V Circuit Breaker, Bolt-On | AmpState
| Part Number | NEB3B040B |
| Amperes | 40 |
| Poles | 3 |
| Voltage | 600 |
| Product Type | circuit-breaker |
Regular price
$5,291.00
Sale price
$5,291.00
Regular price
Unit price
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Seamless online shopping experience guaranteed with easy shipping and returns policy.
Shop with Confidence: Our Products come with a Reliable Year-Long Warranty.
Siemens NEB3B040B 40A 3P 600V Circuit Breaker, Bolt-On | AmpState
Regular price
$5,291.00
Sale price
$5,291.00
Regular price
Unit price
Product description
Shipping
Siemens NEB3B040B is a 40A, 3-pole, 600V bolt-on circuit breaker built for dependable protection in commercial and industrial electrical panels. This OEM-grade unit fits panelboards, load centers, and distribution boards, and is ideal for replacement projects and stocking spares to keep your BOM aligned with the original part number. Available from AmpState.
Why this matters: With a bolt-on mounting design, it delivers a secure, fast installation that minimizes panel downtime. The 3-pole configuration provides balanced protection for three-phase circuits, while the 40A rating safeguards feeders and branch circuits from overload. Rated up to 600V, it stands up to demanding electrical environments common in facilities, manufacturing, and larger offices.
Key features
- Bolt-On Mounting for quick, reliable installation with solid bus connections.
- Three-Phase, 3-Pole Design accommodates standard 3-phase distribution alongside coordinated protection.
- 40 A Rating provides precise overcurrent protection for circuits and equipment rated at or below 40 amps.
- 600V Voltage Rating suited for typical industrial/commercial distribution networks.
- OEM-Grade Siemens Part NEB3B040B ensures BOM compatibility and long-term availability.
- Spare-Ready maintain stock that mirrors original equipment to minimize downtime.
Common use cases
- Replacement of a failed or outdated breaker in Siemens panelboards and load centers.
- Stocking spares for facilities that rely on Siemens protection components to reduce downtime during maintenance.
- Projects requiring BOM alignment to the original part number NEB3B040B for seamless procurement and installation.
- Three-phase distribution feeds in light to medium commercial environments where reliable protection is essential.
Specifications at a glance
- Manufacturer: Siemens
- Part Number: NEB3B040B
- Product Type: Circuit Breaker
- Amperage: 40 A
- Poles: 3
- Voltage: 600V
- Mounting: Bolt-On
Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.
Contact sales@ampstate.com
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What Our Customers Say
General feedback we often hear from customers purchasing industrial electrical parts.
Verified
Lead time was reasonable and the part matched expectations when it arrived.
Procurement · Ontario
Verified
Good value for industrial use. Customers mention easy installation.
Service tech · Field work
