This week, the overall grades of five Electrical Equipment stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Brady Corp. (NYSE:BRC) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Brady Corporation makes and markets identification solutions and products that identify and protect premises, products, and people. In Portfolio Grader’s specific subcategories of Earnings Surprise and Margin Growth, BRC also gets F’s. The stock has a trailing PE Ratio of 31.30. To get an in-depth look at BRC, get Portfolio Grader’s complete analysis of BRC stock.

Sensata Technologies (NYSE:ST) earns a D this week, moving down from last week’s grade of C. Sensata Technologies Holding develops, manufactures, and sells sensors and controls. The stock also rates an F in Earnings Momentum. The stock’s trailing PE Ratio is 34.40. For more information, get Portfolio Grader’s complete analysis of ST stock.

This week, Thermon Group Holdings (NYSE:THR) drops from C to a D rating. Thermon Group Holdings provides engineered thermal solutions for process industries. The stock gets F’s in Earnings Momentum and Earnings Surprise. For a full analysis of THR stock, visit Portfolio Grader.

The rating of FuelCell Energy (NASDAQ:FCEL) slips from 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’s (NYSE:PPO) rating weakens this week, dropping to a D versus last week’s 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 March 22, 2013, 31.8% of outstanding Polypore International shares were held short. The stock currently has a trailing PE Ratio of 27.60. For more information, get Portfolio Grader’s complete analysis of PPO 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.