# TLDR Review: Q120 Circuit Breaker

*Published: 2025-12-30 | Updated: 2025-12-30 | Source: https://shopsavvy.com/reviews-tldr/q120-circuit-breaker*

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## Verdict

The Q120 20-Amp Single Pole Type QP Circuit Breaker is a solid choice if you want a durable, easy-to-install breaker that performs well in RV and transfer switch applications, especially with AC units like the Dometic 13900 BTU. While most users report excellent reliability and value, be aware that a small percentage of units may exhibit faults. If you want to ensure peace of mind, consider purchasing a spare breaker as a backup. Overall, this breaker delivers dependable performance that lasts, making it a smart, budget-friendly pick.

**Top pro:** Works perfectly and meets the 20-Amp rating without issues
**Top con:** A small portion of units might be faulty or have inconsistent reliability across multiple purchases

## Product: Q120 Circuit Breaker
**Brand:** SIEMENS
[Compare prices and price history on ShopSavvy](https://shopsavvy.com/products/q120-circuit-breaker)

## Pros
- Works perfectly and meets the 20-Amp rating without issues
- Easy to install, suitable for both DIY and professional use
- Durable, lasting over 5 years under continuous 17-amp load including startup surges
- Performs reliably with RV applications, including powering a 13,900 BTU Dometic AC unit
- Offers excellent value compared to big box and DIY stores
- Long lifespan reduces the need for frequent replacements
- Product matches the description accurately and provides consistent quality
- Adding a backup breaker option adds an extra layer of security
- Overall, highly satisfying purchase with no regrets reported

## Cons
- A small portion of units might be faulty or have inconsistent reliability across multiple purchases

## Pros vs Cons at a Glance

| Pros | Cons |
|------|------|
| Works perfectly and meets the 20-Amp rating without issues | A small portion of units might be faulty or have inconsistent reliability across multiple purchases |
| Easy to install, suitable for both DIY and professional use |  |
| Durable, lasting over 5 years under continuous 17-amp load including startup surges |  |
| Performs reliably with RV applications, including powering a 13,900 BTU Dometic AC unit |  |
| Offers excellent value compared to big box and DIY stores |  |
| Long lifespan reduces the need for frequent replacements |  |
| Product matches the description accurately and provides consistent quality |  |
| Adding a backup breaker option adds an extra layer of security |  |
| Overall, highly satisfying purchase with no regrets reported |  |

## Current Prices

*Prices checked 2026-10-13.*

| Retailer | Price | Availability | Last seen |
|----------|-------|-------------|-----------|
| [Amazon](https://shopsavvy.com/api/redirect/products/lqhnqSEZyHIAY1yqFP5W/offers/857ce61e-2a46-b95f-2b96-54d3766c5f4c?source=shopsavvy&medium=article-review-tldr) | $7.94  | In Stock | 2026-10-13 |

[See every retailer and the full price history on ShopSavvy](https://shopsavvy.com/products/q120-circuit-breaker)

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*About this review: it summarizes the professional reviews and customer ratings ShopSavvy collected for this product, alongside prices from ShopSavvy's price data (each price shows when it was last seen).*

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