What are Inrush Current Limiters?

Inrush current limiters are protective components used to control the high transient currents that occur when electrical equipment is first energized. They operate by presenting an initial impedance to the circuit, reducing the peak current drawn by capacitive or inductive loads during startup and preventing stress on power sources and downstream components.

By limiting inrush current, these devices help improve system reliability, extend component lifetime, and reduce nuisance tripping of protection devices. Their electrical behavior is defined by current handling capability, voltage rating, and resistance characteristics, which together determine how effectively the limiter manages startup transients under normal operating conditions.

Key Specifications

• Current Rating: Specifies the maximum continuous current the inrush current limiter can carry during steady-state operation. This parameter ensures the device can handle normal load current without overheating or degrading.
• AC Voltage Rating: Defines the maximum alternating current voltage at which the limiter can safely operate. Proper voltage rating is essential to maintain insulation integrity and safe operation in AC power systems.
• Resistance: Indicates the electrical resistance of the limiter, typically at a defined reference condition. Resistance determines the magnitude of inrush current reduction and influences power dissipation during startup and normal operation.

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