Safety and compliance
Products are designed and tested for the stated replacement application. Current listing scope and model details should always be verified in the applicable documentation.
About N-HTB
Engineering replacement circuit breakers for legacy panels
Several members of N-HTB’s core engineering team each bring more than 30 years of hands-on experience developing Federal Pacific (FPE), Zinsco and Pushmatic replacement circuit breakers.
Focused expertise
A practical product line for difficult-to-source applications
N-HTB develops newly manufactured replacement circuit breakers for selected Federal Pacific Electric, Zinsco and Pushmatic panel applications.
That long-term, product-specific experience has built deep practical knowledge in production methods, quality control and safety-focused engineering—experience customers can rely on when selecting replacement circuit breakers for legacy panel applications.
The goal is straightforward: give homeowners, electricians, distributors and maintenance teams a clear way to identify an appropriate replacement by model, rating and panel family—supported by current product documentation.
N-HTB also applies its electrical engineering and manufacturing experience to power inlets, power outlets, emergency switches and OEM electrical-switch projects.
Engineering principles
Safety, fit and usable information
Clear claims and clear product data help customers make better replacement decisions.
Mechanical and electrical fit
Selection starts with the correct panel family, model, amperage, pole count and voltage—not appearance alone.
Clear customer support
Product-family catalogs, searchable model information and direct inquiry tools make it easier to verify a replacement before ordering.
Taiwan manufacturing
Controlled production and quality inspection
N-HTB combines production equipment, assembly processes and human inspection to support consistent product quality across the replacement circuit breaker line.
Certification scope
The finished circuit breaker and terminal component use separate records
Clear wording prevents a component recognition from being mistaken for a complete-product listing.
Complete circuit breaker
ETL Listed to UL 489
This statement applies to complete circuit breaker models included within the current Intertek listing scope. The ETL Listed Mark is a finished-product certification mark issued by Intertek, an OSHA-recognized Nationally Recognized Testing Laboratory.
Verify: Search the Intertek ETL Listed Products Directory by manufacturer or exact model. The official directory controls current status and model coverage.
Open Intertek ETL DirectoryOutput terminal component
UL Recognized Component, File E538985, category ZMMT2
This UL record applies to the equipment-wiring terminal component identified in the file. It is component recognition only and must not be read as a separate UL Listing for the complete circuit breaker.
Important: Component recognition does not replace, broaden or extend the ETL listing scope of the finished circuit breaker.
View UL File E538985
Frequently asked questions
Before choosing a replacement circuit breaker
Are N-HTB circuit breakers refurbished?
No. The product line is presented as newly manufactured replacement circuit breakers rather than refurbished or reclaimed units.
Which panel families are covered?
The current catalog includes selected replacement models for Federal Pacific Electric (FPE), Zinsco and Pushmatic panel applications. Compatibility must be confirmed for the exact panel and circuit breaker position.
Who should install a replacement circuit breaker?
Circuit breaker selection and installation should be handled by a qualified electrician who can confirm the panel, ratings, conductor condition and applicable electrical-code requirements.
How do I choose the correct model?
Start with the panel label and existing circuit breaker markings. Match the panel family, model, amperage, pole count and voltage, then review the current catalog or contact N-HTB before purchase.