Generator Interlock Kit vs Transfer Switch in Kent & Sussex County, DE (2026 Guide)
Generator Interlock vs Transfer Switch: Which One Is Better for Your Home?
If you’re a homeowner in Kent County or Sussex County, Delaware, and you’re planning to install a generator, you’ve probably asked:
Do I need an interlock kit or a transfer switch?
This is one of the most common questions we get from homeowners in Dover, Milford, Camden, and Smyrna.
The truth is — both options work, but they are NOT equal.
And in many cases, choosing the wrong one can cost you more money and create limitations later.
What Is a Generator Interlock Kit? (Most Recommended Option)
A generator interlock kit is installed directly in your main electrical panel.
It allows you to:
- Safely connect a portable generator
- Power your home circuits through your existing panel
- Prevent dangerous backfeeding
Benefits of an Interlock Kit:
- Lower installation cost
- Uses your existing panel
- No need for a separate system
- Allows more flexibility with circuits
- Easier future upgrades
This is the most popular solution in Kent and Sussex County homes.
What Is a Transfer Switch?
A transfer switch is a separate panel installed next to your main panel.
It allows you to:
- Select specific circuits to power during an outage
Limitations of Transfer Switches:
- More expensive
- Limited number of circuits
- Requires additional wiring
- Less flexible than an interlock system
Important Code & Breaker Considerations (Most Electricians Don’t Explain This)
This is where most homeowners get bad advice.
If your home has a new electrical panel with AFCI (arc-fault) and GFCI breakers, there is a critical detail:
Those same protections must be installed in the transfer switch
Why This Matters:
If your main panel has:
- Arc-fault breakers
- GFCI breakers
But your transfer switch does NOT…
The circuits powered during generator use will NOT be protected.
Real-World Problem
We see this often in Delaware:
Homeowners install a transfer switch, but:
- No AFCI protection in the switch
- No GFCI protection in the switch
This creates an unsafe and non-compliant condition.
Why Interlock Kits Are Often the Better Choice
With an interlock kit, you are using your main electrical panel, which already has:
- Proper breakers
- Arc-fault protection
- GFCI protection
No duplication required
No extra breakers needed
This makes interlock systems:
- Simpler
- Safer
- More cost-effective
Learn more about safe electrical upgrades on our Electrical Services page.
Breaker Type Matters (Advanced Code Detail)
In newer panels and transfer switches:
Arc-fault breakers must be the pigtail type — not plug-on neutral type
This is important for:
- Proper installation
- Code compliance
- System performance
If your panel is outdated, check out our Electrical Panel Upgrade services in Kent County.
Cost Comparison in Kent & Sussex County
Interlock Kit Installation:
$800 – $1,500
Transfer Switch Installation:
$1,500 – $3,000+
Interlock = better value for most homeowners
Which Option Should You Choose?
Choose Interlock Kit if:
- You want flexibility
- You want lower cost
- You already have a modern panel
- You want to power multiple circuits
Choose Transfer Switch if:
- You only want a few dedicated circuits
- You are okay with higher cost
- You understand the breaker requirements
Ready to improve your home’s electrical safety? Ask about our Recessed Lighting installation for energy-efficient upgrades alongside your generator setup.
Generator Installation in Kent & Sussex County
LR Electrical installs generator systems in:
- Dover
- Camden
- Milford
- Smyrna
- Kent County
- Sussex County
We also offer professional EV Charger Wiring if you’re looking to power your electric vehicle along with your generator system.
Get the Right Generator Setup the First Time
Choosing the wrong system can cost you more in the long run.
At LR Electrical, we help homeowners in Kent County and Sussex County choose the right setup based on:
- Safety
- Code compliance
- Future expansion
Contact us today to schedule your generator installation.
Frequently Asked Questions
Can I upgrade from a transfer switch later?
Yes, but it often requires additional work and cost.
Is an interlock system safe?
Yes — when installed correctly, it is completely safe and code-compliant.
Do I need a panel upgrade first?
In some homes, yes — especially if your panel is outdated or full.