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Product Details

Description

The Siemens SNW2040B1125 SN Series Main Breaker Load Center provides reliable electrical distribution for residential and light commercial applications. Designed for 120/240V single-phase systems, this 125-amp panel features 20 breaker spaces supporting up to 40 circuits, a factory-installed main breaker, and a plug-on neutral design.

The NEMA 3R weather-resistant enclosure is designed for outdoor installations, while the aluminum bus and plug-on neutral configuration provide a practical solution for modern electrical distribution systems.

Specifications

  • Manufacturer: Siemens

  • Part Number: SNW2040B1125

  • Series: SN Series

  • Product Type: Main Breaker Load Center

  • Main Breaker Rating: 125 Amps

  • Voltage Rating: 120/240V AC

  • Phase: Single-Phase

  • Wire Configuration: 3-Wire

  • Number of Spaces: 20

  • Maximum Circuits: 40

  • Interrupting Rating: 22 kAIC (Factory-Installed Main Breaker)

  • Bus Material: Aluminum

  • Neutral Configuration: Plug-On Neutral

  • Enclosure Rating: NEMA 3R

  • Installation Location: Outdoor

  • Enclosure Dimensions: 27" H × 14.5" W × 4.25" D

  • Color: Gray

  • Mounting: Surface Mount

  • UPC: 804766705847

  • Condition: New

  • Anticipated Shipping Weight: Approximately 31 lb

Features

  • Factory-installed 125-amp main breaker for primary circuit protection

  • 20 full-size breaker spaces supporting up to 40 circuits

  • Plug-on neutral design simplifies installation of compatible AFCI and GFCI breakers

  • NEMA 3R outdoor-rated enclosure provides protection against rain and environmental exposure when properly installed

  • Aluminum bus construction

  • Suitable for use as service equipment when installed in accordance with applicable requirements

  • Designed for Siemens-approved circuit breakers

Applications

Suitable for residential electrical distribution, outdoor service equipment installations, garages, workshops, detached structures, and light commercial applications requiring a 125-amp main breaker panel.

Installation Notes

Installation must comply with applicable electrical codes and manufacturer instructions. Verify breaker compatibility, conductor sizing, grounding and bonding requirements, and utility specifications before installation.

Branch circuit breakers are sold separately unless otherwise specified.

Customer Reviews
Is this product in stock?

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Yes. We are an authorized dealer of the products we sell, so you can purchase with confidence knowing you’re receiving a genuine, authentic product backed by the manufacturer’s applicable warranty.

How quickly will my order ship?

Most in-stock orders are processed within 1–3 business days. Standard shipping typically takes 1–5 business days, depending on your location.

Can I return this product?

Yes. Most products can be returned within 30 days of your order date, provided they are new and unused. Some exclusions and conditions apply. Please review our Return Policy for complete details.

Are there restocking fees?

Yes. A 30% restocking fee applies to eligible returns. Original shipping charges are non-refundable, and customers are responsible for return shipping costs. The restocking fee can be waived with a new order.

Is this product UL Listed or ETL Listed?

Certifications vary by product. Please review the product specifications or contact us to confirm certification details.

Does this item include a manufacturer warranty?

Most products are covered by the manufacturer's warranty. Warranty terms and coverage vary by brand and product.

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