B57235S479M

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Inrush Current Limiters (ICLs) are used to protect electronic circuit components from large transient current peaks that can occur when power is initially applied. The B57235S479M is a specialist ICL for protecting coaxial relay coils that is commonly used in a wide range of industries for protecting relays from inrush currents. To understand fully what this component does and how it works, we shall look at the mechanism of inrush current protection and the working principle of the B57235S479M in more detail.

What is an Inrush Current?

An inrush current is an initial surge of electric current that rushes into an electrical system when power is applied. Inrush currents are triggered by the charging of capacitors or the energizing of relays and can result in damage to connected electronic circuit components. ICLs limit or regulate these currents to safe staying within safe level limits. Within the relay coil environment, inrush currents are particularly troublesome as their inductive nature causes them to rise much faster than normal supply voltages.

Application of the B57235S479M

The B57235S479M ICL is specifically designed and rated to protect coaxial relays from surges in current and is commonly used in a wide range of applications including telecommunications, instrumentation, renewable energy, and power distribution.

This ICL is suitable for both AC and DC supply systems and can be used in almost any type of coaxial relay installation where adequate current protection is essential. The B57235S479M offers a wide range of features that make it an ideal choice for protecting relays from inrush currents. These include switching frequencies of up to 50 KHz and an inrush limiting range of 16 to 24 A.

Working Principle of the B57235S479M

The B57235S479M ICL works by limiting the current flow to the relay coil so that rather than steadily escalating from the power source, the current is ramped up in a controlled manner. This provides protection from dangerous current levels which are likely to cause damage to the relay and its connected components. This ICL is designed to protect against inrush currents by limiting the current to 16-24 A which is sufficient for most applications.

The device uses a combination of components to achieve this current limiting effect. A resistor, diode, capacitor, and two PTC thermistors are present, as well as a series of shunts, all of which contribute to the precise limit of the current. As the relay coil begins to draw current, the initial current will be drawn across the resistor and capacitor which will gradually decrease the resistance and thus serve to reduce the current. The diode then forces the current to flow through the two in parallel PTC thermistors, which further reduce the current, and the current will then be directed through a series of shunts to achieve the final limit.

Conclusion

In this article, we have examined the application field and working principle of the B57235S479M inrush current limiter. We have seen how this ICL is specifically designed and rated for protecting coaxial relays from dangerous inrush currents and is commonly used in industries such as telecommunications, instrumentation, renewable energy, and power distribution.

Finally, we looked at the working principle of the B57235S479M in detail. This ICL works by limiting the current flow to the relay coil in a controlled manner by using a combination of components including a resistor, diode, capacitor, and two PTC thermistors, as well as a series of shunts.

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