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Load Center 30S/42C MB 200A CU Generator Ready

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  • Generator Ready Load Center with tin plated copper bus bars
  • 2 spaces & 2 circuits are reserved for standby generator install
  • Transfer Switch Sold Seperately (Part# GENTFRSWTCH)
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Product Overview

The Siemens generator ready load center can save thousands of dollars in future generator installation expenses while keeping initial expenses to a minimum. allowing for a combination of a load center, transfer switch and critical circuit sub panel into one neat enclosure. This version (model G3042B1200GEN) has a maximum amperage rating of 200 Amp and it also comes in a 225 Amp version. The load center has two interiors, both powered by utility power under normal operating conditions. When utility power is lost, a transfer mechanism switches so that only one interior, which contains the critical circuits, is backed up by a generator. This allows for the use of a smaller, more cost-effective generator and to prevent that generator from being overloaded. The lower standby protected section has 18 (1 in.) spaces for 30 circuits, while the upper utility-only section has 10 (1 in.) spaces for 10-circuits. An additional two spaces and two circuits are reserved for generator installation. It features a NEMA 1 enclosure for indoor use and it's designed to accept the Siemens Automatic Transfer Switch (GENTFRSWTCH).
  • Flush or surface mounting
  • Main breaker convertible to main lug with use of lug kit part no. ECMLK225
  • Installation of transfer mechanism can be performed at time of generator installation
  • Generator ready load center has a total of 30 spaces/42 circuits and all 30 spaces/42 circuits are powered by utility power and 18 spaces/30 circuits are backed up by the generator
  • Learn More About Electrical Panels Here in our Buying Guide.

Info & Guides

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Load Center 30S/42C MB 200A CU Generator Ready
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NameLoad Center 30S/42C MB 200A CU Generator Ready200 Amp 30-Space 42-Circuit Main Breaker Generator Ready Outdoor Load CenterPN Series 200 Amp 30-Space 48-Circuit Main Breaker Plug-On Neutral Load Center Indoor with Copper Bus
Number of Spaces303030
Load Center TypeMain BreakerMain BreakerMain Breaker
Number of Circuits424248
Electrical Product TypeLoad CenterLoad CenterLoad Center
Load center width (in.)171715.940
Mounting TypeBolt OnBolt OnPlug-On Neutral
Maximum Amperage (amps)200200200
Load center height (in.)665.620
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Load center depth (in.)
Load center height (in.)
Load center width (in.)


Electrical Product Type
Load Center
Load Center Mounting Type
Load Center Type
Main Breaker
Maximum Amperage (amps)
Mounting Type
Bolt On
NEMA Configuration
NEMA Configuration Receptacle
No Receptacle
Number of Circuits
Number of Spaces
Phase Type
1 Phase
Product Weight (lb.)
39.5 lb
Voltage (volts)

Warranty / Certifications

Certifications and Listings
UL Listed
Manufacturer Warranty
1 year

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 3
    out of 3 reviews
  • 0%recommend this product
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Showing 1-3 of 3 reviews
dont buy
Product is not as advertised. Product did not arrived as promosed
Response from SIEMENS Product ExpertAug 13, 2021
I apologize for the issue that you had with your Siemens Load Center. We take great pride in the quality of our products. We would like to understand your specific situation and address any issues you may have. Please feel free to reach out to Siemens Technical Support at 1-800-333-7421. We would like to help troubleshoot the issue you are having or provide a replacement unit if necessary. SIEMENS
    Has all the bells and whistles. Great for a standby...
    Has all the bells and whistles. Great for a standby generator and portable generator.
    • Verified Purchase
    Wish it had more spaces!...
    Wish it had more spaces!
    Response from SIEMENS Product ExpertJun 11, 2018
    Hello Peter,
    We actually do have a G4254B1200GEN which would give you 12 additional spaces if you would like to explore that option! SIEMENS
    • Verified Purchase
    Showing 1-3 of 3 reviews