What Is a Generator Interlock?
A Generator Interlock is a mechanical device fitted to an electrical panel that prevents the utility main breaker and a generator breaker from being on at the same time. The interlock guides power through the panel while blocking conflicting breaker positions. This arrangement supports controlled generator connection without transferring power through an unintended path.
Quick Facts About Generator Interlock
Category
Generator connection hardware
Used for
Managing panel power sources
Common confusion
Often confused with a transfer switch
Also called
Interlock Kit, Generator interlock kit
Often discussed with
Generator Repair
Key Takeaways About Generator Interlock
- The device is a panel-mounted mechanical blocking mechanism.
- Breaker position controls which power source feeds the panel.
- An interlock is not the same as a transfer switch.
How Generator Interlock Works
A Generator Interlock moves or slides across the face of a load center so the utility main breaker and the generator breaker cannot occupy conflicting positions. The panel receives power from one selected source while the interlock blocks the other source. The generator breaker then feeds selected circuits through the existing panel.
Related glossary terms: Transfer Switch, Load Center, Electrical Bonding.
The interlock works as part of a complete generator connection. A compatible load center, generator inlet, wiring, grounding arrangement, and overcurrent protection all affect how the setup functions. A transfer switch performs source switching through a separate enclosure and mechanism, while an interlock operates at the panel. An electrician checks the panel design, breaker arrangement, and generator connection before applying this approach.
From the Cincelux Electric team
When we handle Generator Repair, we inspect the interlock for proper fit, movement, and alignment with the panel breakers. We also check the generator connection and panel labeling so the equipment operates as one coordinated system. A damaged or mismatched interlock can affect the entire connection.
Generator Interlock in Practice: A Real-World Example
A Cincinnati home has a portable generator connection at the electrical panel after a storm-related outage. The generator interlock blocks the utility main breaker while the generator breaker supplies selected household circuits through the panel.
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Related Terms
Transfer Switch
A Transfer Switch is an electrical switching device that moves selected circuits between a utility supply…
Load Center
A Load Center is an electrical enclosure that houses circuit breakers and distributes power from the…
Electrical Bonding
Electrical Bonding is the connection of metal parts, electrical equipment, and conductive pathways so they share…
Overcurrent Protection
Overcurrent protection is a system that limits electrical current when a circuit carries more electricity than…
Cincelux Electric
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