Generator Transfer Switch Kits
Automatic and manual transfer switches from 100 to 800+ amps. Seamlessly connect your standby generator to your home's electrical system with code-compliant, UL-listed transfer switch solutions from trusted brands.
Whole House Protection
Service disconnect transfer switches provide complete power protection without choosing circuits. Available in 100A to 800A configurations for residential and commercial applications.
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We carry transfer switches from the most trusted names in backup power. Click a brand to filter products.
Generator Transfer Switch Kits
Automatic transfer switches (ATS) and manual transfer switches for seamless generator integration. All products are UL-listed and code-compliant.
Transfer Switch Compatibility Finder
Answer a few questions to find the right transfer switch for your generator and electrical system.
Find Your Perfect Match
Our compatibility tool helps you select the correct transfer switch based on your generator and service panel specifications.
Recommended Transfer Switch
Based on your specifications
Automatic vs. Manual Transfer Switches
Understanding the differences helps you choose the right solution for your backup power needs.
Automatic Transfer Switch
Hands-free power protection
- Automatically detects power outage and starts generator
- Transfers power within seconds (typically under 10 seconds)
- No manual intervention required during outages
- Works even when you are away from home
- Returns to utility power automatically when restored
- Ideal for medical equipment, security systems, sump pumps
Best For
Homeowners who want complete peace of mind, those with medical equipment, frequently absent homeowners, and anyone wanting seamless backup power.
Manual Transfer Switch
Budget-friendly control
- Lower upfront cost compared to automatic switches
- Works with portable generators
- Simple mechanical operation with fewer parts
- Requires you to be home to activate
- Must manually start generator and flip switch
- Power outage continues until manual action taken
Best For
Budget-conscious buyers, those using portable generators, homeowners who are typically present during storms, and short-term or infrequent backup power needs.
Transfer Switch Sizing Guide
Match your transfer switch amperage to your main electrical panel for proper installation and code compliance.
| Main Panel Size | Transfer Switch Size | Generator Size Range | Typical Application |
|---|---|---|---|
| 100 Amp | 100 Amp ATS | 10 - 16 kW | Small homes, condos, townhouses |
| 150 Amp | 150 Amp ATS | 16 - 20 kW | Medium homes, partial load management |
| 200 Amp | 200 Amp ATS | 20 - 26 kW | Large homes, whole house coverage |
| 400 Amp | 400 Amp ATS | 30 - 60 kW | Large estates, small commercial |
| 600+ Amp | 600 - 800 Amp ATS | 60 - 150 kW | Commercial, industrial, multi-family |
Need a Larger Transfer Switch?
We can source transfer switches up to 4000 Amps for commercial and industrial applications. Contact our team for custom configurations, three-phase systems, and specialized installation requirements.
Understanding Generator Transfer Switch Kits
A generator transfer switch is the critical link between your standby generator and your home's electrical system. This essential component ensures safe, code-compliant power transfer during outages while preventing dangerous backfeed to utility lines. Whether you are installing a new whole house generator or upgrading an existing backup power system, selecting the right transfer switch is crucial for safety and performance.
What Is a Transfer Switch and Why Do You Need One?
A transfer switch is an electrical device that safely switches your home's power source between utility power and generator power. The National Electrical Code (NEC) requires transfer switches for all permanently installed generators to prevent backfeeding, which can endanger utility workers and damage electrical equipment. Transfer switches also protect your generator from damage when utility power is restored.
Without a proper transfer switch, connecting a generator directly to your electrical panel is not only illegal in most jurisdictions but extremely dangerous. The transfer switch acts as a gatekeeper, ensuring only one power source feeds your home at any time.
Types of Generator Transfer Switches
Transfer switches fall into two main categories: automatic transfer switches (ATS) and manual transfer switches (MTS). Automatic transfer switches monitor utility power continuously and initiate generator startup and power transfer without any human intervention. When utility power fails, the ATS signals the generator to start, waits for it to stabilize, then transfers your home's load to generator power. This entire process typically takes less than 10 seconds.
Manual transfer switches require you to physically flip a switch or turn a handle to transfer power. While less convenient, they cost significantly less and work well with portable generators. Manual switches are popular for homeowners who want basic backup power capability without the investment in a fully automatic system.
Choosing the Right Amperage
Your transfer switch amperage should match or exceed your main electrical panel's amperage rating. A 200-amp home requires a 200-amp transfer switch for whole house coverage. Some homeowners with larger generators opt for load management systems that intelligently prioritize circuits, allowing a smaller generator to power essential loads during extended outages.
Service entrance rated transfer switches serve as both the main disconnect for your home and the transfer mechanism. These units simplify installation and meet code requirements for a main disconnect at the service entrance. They are the most common choice for whole house generator installations.
Key Features to Consider
Modern automatic transfer switches include features like exercise scheduling, which runs your generator briefly each week to ensure it remains ready. WiFi monitoring allows you to check generator status from your smartphone and receive alerts for power events. Load shedding capabilities let larger generators power entire homes by temporarily disconnecting non-essential circuits during peak demand.
Weather-resistant NEMA 3R rated enclosures are essential for outdoor installations. Indoor-only units (NEMA 1) cost less but require protected installation locations. Consider your installation site carefully when selecting an enclosure rating.
Professional Installation Requirements
Transfer switch installation requires a licensed electrician in virtually all jurisdictions. The installation involves working with your home's main electrical service, which requires permits and inspections. Your electrician will need to coordinate with your utility company, as many require notification before generator installations.
Proper installation ensures your system meets local codes and manufacturer warranty requirements. A qualified installer will also verify that your generator, transfer switch, and electrical panel work together correctly and safely.
Frequently Asked Questions
Common questions about generator transfer switches answered by our experts.
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