What do the numbers and letter on a solenoid mean?

The numbers and letters on a solenoid typically indicate its specifications, including voltage rating, resistance, and duty cycle. For example, a solenoid labeled as "12V DC" signifies it operates at a 12-volt direct current. Additional letters may denote the type of solenoid or its intended application, such as "N.O." for normally open or "N.C." for normally closed. Understanding these designations helps in selecting the appropriate solenoid for specific electrical and mechanical applications.