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

This week, Sensata Technologies (NYSE:ST) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Sensata Technologies Holding develops, manufactures, and sells sensors and controls. For Portfolio Grader’s specific subcategory of Earnings Momentum, ST also gets an F. The trailing PE Ratio for the stock is 34.90. For a full analysis of ST stock, visit Portfolio Grader.

Thermon Group Holdings (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 price has fallen 12.1% over the past month, worse than the 2.4% increase the S&P 500 has seen over the same period of time. To get an in-depth look at THR, get Portfolio Grader’s complete analysis of THR stock.

FuelCell Energy’s (NASDAQ:FCEL) rating weakens this week, dropping to a D versus last week’s C. 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. For more information, get Portfolio Grader’s complete analysis of FCEL stock.

Polypore International (NYSE:PPO) is having a tough week. The company’s rating falls from a C to a D. 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 May 3, 2013, 32.2% of outstanding Polypore International shares were held short. The stock has a trailing PE Ratio of 27.10. For a full analysis of PPO stock, visit Portfolio Grader.

Brady Corp. (NYSE:BRC) experiences a ratings drop this week, going from last week’s 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. The stock’s trailing PE Ratio is 29.10. 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.