B57213P0509M301

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Inrush Current Limiters (ICL)

Inrush current limiters (ICLs) are devices that limit the surge and peak current that occur during the initiation of a power supply to a safe level, protecting the system and its components from the damage that high-powered peaks can cause. One such device, the B57213P0509M301, is part of EPCOS\' AC/DC electronic components range.

Inrush current jumps to a high level upon the connection of an AC/DC power supply. This is because the capacitance of the filter will draw in a large load initially. By setting current limitations or thresholds, an inrush current limiter helps to grant suppression of the current so that it has a smoother transition, with a much lower and safer surge.

Application Field and Working Principles of B57213P0509M301

The B57213P0509M301 is a particularly popular choice for power cell protection and current limitation. It is a metal oxide varistor (MOV) with a capacitance of 50nF and a threshold limiting voltage of 135V. Its primary function ascertains a soft start, controlled inrush current, and overvoltage protection for small power supplies in consumer electronics products like computers, DVDs, and other IT equipment.

The working principle behind the device is straightforward but important. Upon power connection, the MOV offers limited current leading to a soft start. This gradual surge manages high startup inrush current and reduces inrush current without an additional RC network. This eliminates the need for external components to manage the inrush current.

When the peak voltage exceeds the threshold voltage of the MOV, the device’s dynamic resistance quickly adapts to reduce the current, preventing overvoltage stress and helping the power supply remain safe. In the case of a short circuit or a surge, the device’s clamping characteristic works to reduce the voltage.

When the source voltage passes through an MOV, its capacitance property ensures it\'ll absorb equilibrium from the charge and its insulation characteristics reduce discharge current.

The B57213P0509M301 is considered exceptionally reliable for inrush current suppression. It has a mechanical lifetime of 500 cycles, a rated operating temperature range from -40C to +125C, and an AC test voltage of 2250V/s.

In short, the device\'s performance enables the production of high-efficiency, low-cost power demarcations for a variety of modern consumer electronics products.

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