Which description best fits reed switches regarding installation cost?

• A. Expensive
• B. Inexpensive
• C. Moderate
• D. Variable

Answer: (B)

The main idea is that installation cost for reed switches is typically low. Reed switches are small, sealed, and passive devices that close when a magnetic field is present. Because they don’t require power, complex electronics, or precise calibration to operate, the installation mostly involves mounting the switch and running a simple set of wires. This simplicity translates to lower labor time and fewer components, which keeps costs down. In common applications like door or window sensors, mounting is straightforward with basic hardware, making the overall installation inexpensive. Minor extra costs for protective housings or magnets can occur, but they don’t typically elevate the total cost to anything other than inexpensive.