## Load Types & Ratings

### Applications

Load Types & Ratings

Inrush current is a current that is much larger than the steady-state current and that flows as soon as power is input to the electric circuits that operate the load.
Inrush current occurs for loads such as motors and incandescent lamps.

#### 1. Inrush Current

• Resistive Loads

The current is constant from the time that power is turned ON.
• Lamp Loads

Inrush current of approximately 10 times the steady-state current flows as soon as power is turned ON and then the current becomes constant.

#### 2. Inrush Current and Ratings

If ratings are given for both motor loads and lamp loads, switch applicability is determined with the relevant value.
If the rating is given only for a resistive load, the inrush current for the actual load is calculated to determine if the rating would be exceeded.

Examples:
 Heater: → A resistive load. The steady-state current must be less than the resistive load rating. Incandescent lamp: → A lamp load. Ten times the steady-state current must be less than the resistive load rating. Motor: → A motor load. Six times the steady-state current must be less than the resistive load rating.

Include the inrush current when you consider ratings.