# How do I lower my power supply inrush current?

## How do I lower my power supply inrush current?

Inrush current can be reduced by increasing the voltage rise time on the load capacitance and slowing down the rate at which the capacitors charge.

### What is inrush current in power supply?

Inrush current is the instantaneous high input current drawn by a power supply or electrical equipment at turn-on. This arises due to the high initial currents required to charge the capacitors and inductors or transformers. The inrush current is also known as the switch–on surge, or the input surge current.

#### Will inrush current trip a breaker?

Circuit breaker may be shut off by the inrush current depending on its characteristics. Therefore, circuit breaker should be chosen not to be tripped by the short term inrush current.

The ratio of inrush current to normal full-load current can range from 5 to 100 times greater. This current surge can cause component damage and/or failure within the equipment itself, blown fuses, tripped circuit breakers, and may severely limit the number of devices connected to a common power source.

How much inrush current is too much?

52 is not sufficient for the starting current (inrush current) experienced by the motor, the electrician is allowed to increase the circuit-breaker size even further, up to a maximum of 400% for loads that do not exceed 100 amps. And up to a maximum of 300% for loads that are greater than 100 amps.

## How is inrush calculated?

The range is given in thousands of Volt-Amps, or kilowatts. Multiply each number in the range by 1,000. Divide each result by the motor voltage found on the nameplate. The resulting range is the inrush current range.

### Do you size a breaker for in inrush current?

#### Why is inrush current important?

Measuring of Inrush Current: Measuring this high startup current is important to determine the proper corrective equipment to install, such as surge limiters, soft start devices or simply increasing wire size.

Why is inrush current so high?

High inrush current is the result of the maximum instantaneous input current drawn by an electrical device during the initial power up. As technology continues to advance, most systems today run efficiently and maintain a low impedance which in turn contributes to high inrush current.

How is motor inrush current calculated?