This week, the ratings of five Electrical Equipment stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Sensata Technologies Holding NV’s (NYSE:ST) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Sensata Technologies Holding develops, manufactures, and sells sensors and controls. ST also rates an F in Portfolio Grader’s specific subcategory of Earnings Momentum. The stock currently has a trailing PE Ratio of 40.30. For a full analysis of ST stock, visit Portfolio Grader.

Thermon Group Holdings, Inc. (NYSE:THR) earns a D this week, falling from last week’s grade of C. Thermon Group Holdings provides engineered thermal solutions for process industries. The stock gets F’s in Earnings Momentum and Earnings Surprise. The stock has a trailing PE Ratio of 50.10. For more information, get Portfolio Grader’s complete analysis of THR stock.

The rating of FuelCell Energy, Inc. (NASDAQ:FCEL) slips from a C to a D. Fuelcell Energy develops and commercializes fuel cell power plants for electric power generation. The stock gets F’s in Earnings Revisions, Equity, and Cash Flow. To get an in-depth look at FCEL, get Portfolio Grader’s complete analysis of FCEL stock.

Polypore International, Inc. (NYSE:PPO) earns a D this week, moving down from last week’s grade of C. Polypore International develops, manufactures, and markets specialized polymer-based membranes used in separation and filtration processes. The stock gets F’s in Earnings Revisions and Earnings Surprise. As of Aug. 30, 2013, 26.7% of outstanding Polypore International, Inc. shares were held short. The stock’s trailing PE Ratio is 36.00. For more information, get Portfolio Grader’s complete analysis of PPO stock.

The rating of Brady Corporation Class A (NYSE:BRC) declines this week from a C to a D. Brady Corporation makes and markets identification solutions and products that identify and protect premises, products, and people. The stock gets F’s in Earnings Surprise and Margin Growth. To get an in-depth look at BRC, get Portfolio Grader’s complete analysis of BRC stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.