A home’s electrical panel is the central distribution point for its electrical system. It receives incoming power and distributes it through individual circuits for lighting, receptacles, appliances, HVAC equipment and other electrical loads.
CAPO Supply carries Siemens residential load centers in both 100-amp and 200-amp configurations, including panels with factory-installed main breakers and main-lug panels commonly used for subpanel applications.
Choosing Between a 100-Amp and 200-Amp Panel
The appropriate panel size depends on the electrical demands of the property and the requirements of the installation.
A 100-amp panel may be suitable for smaller homes, garages, workshops, additions and properties with moderate electrical demand. These panels are also commonly used where the existing service capacity or project scope does not require a larger load center.
A 200-amp panel is widely used for modern residential service installations. The additional capacity helps accommodate larger appliances, electric heating and cooling equipment, workshops, finished basements, home additions, electric vehicle charging and future circuit expansion.
Panel size should always be selected through a proper load calculation and installed in accordance with applicable electrical codes.
Main-Breaker Load Centers
A main-breaker load center includes a primary breaker that disconnects power to the circuits supplied by the panel.
These panels are commonly used as the main electrical distribution panel for a home. The main breaker provides a single disconnecting point and protects the panel bus from currents exceeding its rated capacity.
Siemens main-breaker load centers are available in common residential service sizes, including 100 amps and 200 amps. The correct panel configuration will depend on the service rating, number of circuits, mounting requirements and available space.
Main-Lug Panels for Subpanel Applications
A main-lug load center does not include a main breaker inside the panel. Instead, the panel is supplied from an upstream breaker located in the main service panel or another approved distribution point.
Main-lug panels are frequently used as subpanels in:
- Detached garages
- Workshops
- Home additions
- Finished basements
- Utility buildings
- Equipment rooms
- Areas requiring additional circuit capacity
When a panel is installed as a subpanel, the neutral and equipment grounding conductors must be handled correctly. In most subpanel applications, the neutral is isolated from the enclosure while the grounding bar is bonded to the panel cabinet. The exact installation must follow the panel instructions and applicable code requirements.
Planning for Circuit Capacity
Amperage is only one part of panel selection. Contractors and homeowners should also consider the number of available spaces and circuits.
A panel with additional circuit capacity can make future additions easier. This may be especially important when planning for:
- Electric vehicle chargers
- Heat pumps
- Central air-conditioning systems
- Electric water heaters
- Sump pumps
- Workshops and power tools
- Finished basements
- Outdoor equipment
- Additional kitchen or laundry circuits
Selecting a panel with enough room for anticipated expansion can help reduce the need for another panel upgrade later.
Use Siemens Breakers Listed for the Panel
Circuit breakers are not universally interchangeable. Breakers installed in a Siemens load center must be specifically listed and approved for use with that panel.
Using the correct Siemens breaker helps maintain the panel’s listing, proper bus connection and intended overcurrent protection. The panel label and manufacturer documentation should always be reviewed before selecting breakers or accessories.
Main Panel or Subpanel?
The basic distinction is straightforward:
A main-breaker panel is generally used where a primary disconnect is required at the panel.
A main-lug panel is commonly used as a subpanel when overcurrent protection and disconnecting means are already provided upstream.
The final selection depends on the electrical design, service arrangement and local code requirements. A qualified electrician should determine the proper panel type and installation method.
Siemens Residential Panels Available from CAPO Supply
CAPO Supply carries Siemens 100-amp and 200-amp residential load centers for service replacements, new construction, additions, garages and subpanel installations.
Our team can help contractors identify the correct panel configuration, matching Siemens breakers and related installation materials for the job.
Contact CAPO Supply for current availability and assistance selecting a Siemens load center for your next residential electrical project.