Introduction
Power outages are more than just an inconvenience. They can disrupt work, compromise safety, and cause real financial loss. A reliable generator is only half of the solution. The other half is a safe, code-compliant way to connect that generator to your electrical system. This is where a well-designed generator interlock becomes essential.
The Generator Interlock WR-95 is designed specifically for homeowners and electricians who need a dependable interlock solution for Siemens, Murray, or ITE 100 amp sub panels. Made from billet aluminum in the USA and designed to meet National Electrical Code requirements, this interlock kit focuses on safety, durability, and ease of installation.
This in-depth Generator Interlock WR-95 review explores its build quality, compatibility, safety features, installation process, and real-world performance. The goal is to provide clear, practical information so you can decide whether this interlock kit is the right choice for your electrical setup.
What Is a Generator Interlock and Why It Matters
A generator interlock is a mechanical safety device that prevents the main breaker and generator breaker from being on at the same time. This simple function is critically important.
Without an interlock, electricity from a generator could backfeed into utility lines, putting utility workers and your own equipment at serious risk. An interlock ensures that power flows in only one direction at a time, protecting people, appliances, and your electrical panel.
The Generator Interlock WR-95 is engineered for 100 amp sub panels and provides a physical barrier that enforces safe operation without relying on user memory or labels alone.
Product Overview
The WR-95 generator interlock kit is precision-machined from billet aluminum and designed to fit specific Siemens, Murray, and ITE panel configurations. Unlike universal or adjustable kits, this model is panel-specific, which improves alignment and long-term reliability.
This kit includes everything required for installation, including mounting hardware, a drill bit, and safety stickers for panel identification. It is intended for use in accordance with Article 702 of the National Electrical Code, which governs optional standby systems.
Generator Interlock WR-95 Key Specifications
The following table summarizes the core product data as listed on Amazon product documentation.
Product Data Table
| Feature | Specification |
|---|---|
| Product Name | Generator Interlock WR-95 |
| Panel Compatibility | Siemens, Murray, ITE |
| Panel Rating | 100 Amp Sub Panel |
| Material | Billet Aluminum |
| Manufacturing Origin | Made in the USA |
| Electrical Code Compliance | NEC Article 702 |
| Installation Instructions | Included |
| Mounting Hardware | Included |
| Drill Bit | Included |
| Panel Stickers | Included |
| Intended Use | Generator Interlock Safety Device |
This data reflects manufacturer-provided specifications commonly displayed in Amazon product listings.
Build Quality and Materials
One of the standout features of the Generator Interlock WR-95 is its construction. Billet aluminum is not stamped or cast; it is machined from a solid block of metal. This results in higher structural integrity, consistent thickness, and clean edges.
Advantages of Billet Aluminum
- High resistance to bending or warping
- Excellent corrosion resistance
- Long service life even in electrical panel environments
- Precise tolerances for smooth breaker operation
The aluminum finish is smooth and professional, with no sharp edges that could damage wires or cause injury during installation. Compared to thinner steel or composite interlocks, the WR-95 feels solid and purpose-built.
Compatibility and Panel Fitment
Compatibility is one of the most important considerations when selecting a generator interlock. The WR-95 is designed specifically for:
- Siemens 100 amp sub panels
- Murray 100 amp sub panels
- ITE 100 amp sub panels
Because this is not a universal interlock, the fit is more precise. The breaker slide movement aligns cleanly with the main breaker and generator breaker positions, reducing wear and minimizing the risk of improper operation.
This targeted compatibility also simplifies installation, as there is no need for excessive adjustments or guesswork.
Safety and Electrical Code Compliance
Safety is the primary purpose of any generator interlock, and the WR-95 performs this role effectively.
NEC Article 702 Compliance
The WR-95 is suitable for use in accordance with Article 702 of the National Electrical Code. This section governs optional standby systems and outlines safety requirements for generator connections.
By physically preventing simultaneous operation of the utility and generator breakers, the WR-95 supports compliance with these standards when installed correctly.
Physical Safety Advantages
- Eliminates accidental backfeeding
- Prevents human error during power transfer
- Provides visible confirmation of breaker status
- Reduces liability and safety risks
The inclusion of panel stickers also improves safety by clearly identifying generator-related breakers and procedures inside the panel.
Installation Experience
Installation is often a concern for homeowners, but the Generator Interlock WR-95 is designed to simplify the process.
Included Installation Components
- Detailed installation instructions
- All required mounting hardware
- Correctly sized drill bit
- Panel identification stickers
Having the drill bit included is a small but valuable detail. It ensures hole size accuracy and reduces the chance of improper mounting.
Installation Process Overview
While installation should always be performed by a qualified electrician or someone with electrical experience, the process generally includes:
- Turning off all power sources
- Removing the panel cover
- Marking drill locations using the interlock as a guide
- Drilling mounting holes
- Securing the interlock with included hardware
- Applying panel stickers
- Testing breaker movement
The precision machining of the WR-95 allows smooth sliding action without binding or misalignment.
Real-World Performance
Once installed, the Generator Interlock WR-95 performs its function quietly and reliably. There are no moving parts beyond the sliding plate itself, which means minimal maintenance and long-term dependability.
Daily Use and Emergency Operation
During an outage, switching from utility power to generator power is straightforward:
- The interlock forces the main breaker off before the generator breaker can be turned on
- When utility power returns, the process is reversed
This mechanical logic reduces stress during emergencies and ensures consistent, safe operation every time.
Comparison with Transfer Switches
Many homeowners debate between a generator interlock and a transfer switch. Each has its place, but the WR-95 offers distinct advantages.
Generator Interlock vs Transfer Switch
| Feature | Generator Interlock WR-95 | Transfer Switch |
|---|---|---|
| Cost | Lower | Higher |
| Installation Complexity | Moderate | Higher |
| Panel Modification | Minimal | Significant |
| Circuit Flexibility | Full panel | Limited circuits |
| Maintenance | Minimal | Moderate |
For those who want access to their entire panel rather than selected circuits, a generator interlock like the WR-95 is often the preferred solution.
Durability and Long-Term Value
Because the WR-95 is machined from billet aluminum and made in the USA, it offers excellent long-term value. It is not a disposable or temporary solution. Once installed, it is expected to last the lifetime of the panel.
There are no springs, electronics, or wear-prone components, which significantly reduces the chance of failure over time.
Who Should Buy the Generator Interlock WR-95
This interlock kit is best suited for:
- Homeowners with Siemens, Murray, or ITE 100 amp sub panels
- Users who want a code-compliant generator connection
- Those seeking a durable, USA-made solution
- Electricians who prefer panel-specific interlocks
It may not be suitable for panels outside the listed compatibility range or for main service panels with different breaker layouts.
Common Questions Answered
Is this interlock difficult to install?
With included instructions and hardware, installation is straightforward for experienced individuals. Professional installation is recommended for safety.
Does it work with portable generators?
Yes, when used with a properly installed generator inlet and breaker, it works with portable generators.
Is the aluminum strong enough?
Billet aluminum is more than strong enough for this application and offers excellent durability.
Final Verdict
The Generator Interlock WR-95 stands out as a well-engineered, safety-focused solution for generator integration with Siemens, Murray, and ITE 100 amp sub panels. Its billet aluminum construction, precise compatibility, and inclusion of all necessary installation components make it a strong choice for both homeowners and professionals.
This Generator Interlock WR-95 review finds that the product delivers exactly what it promises: safe, reliable power transfer with long-term durability and compliance with electrical standards.
For those seeking a dependable generator interlock without unnecessary complexity, the WR-95 represents solid value and peace of mind.