L25J25KE

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Chassis Mount Resistors - L25J25KE Application Field and Working Principle

Chassis mount resistors are resistors which are usually bolted, screwed or welded on a frame/chassis to act as a heat sink, thereby dissipating the heat produced by the resistor. The chassis mount resistors type L25J25KE, manufactured by Vishay Inter Tech, is a robust resistor that is constructed to resist mechanical and temperature stresses in hostile environments and is rated for up to 1000Vdc from -55° C to +125° C and up to 300Vmv from -55° C to +85° C.

The L25J25KE series of chassis mount resistors comes in various wattages ranging from 0.5 Watt to 25 Watt. The most popular element type in the L25J25KE series is the J-Type (graphite-film) resistor. The J-types feature a rugged one piece construction with heavy insulating layers designed to protect against environmental contaminants. The J-types also feature a thermal cutoff protection feature which allows the resistor to safely self-destruct in case of current overload.

The L25J25KE series is ideal for a wide range of applications, including industrial and consumer electronics, robotics, commercial and military systems, automotive electronics, and power supplies. Typically, these components are used as safety resistors, limiters, and shunts in high-voltage applications up to 1000 VDC. The J-type is also an option where component size is critical, such as in medical or computer equipment.

Working Principle

A resistor is an electrical device, which when connected in a circuit, restricts current flow by transforming electrical energy into heat energy. Resistor resistance is established by the length, width, and thickness of the resistor\'s bare wires and the resistors ability to dissipate heat. In other words, a higher wattage rating allows the resistor to dissipate more heat energy.

The working principle of the L25J25KE series is based on the electrical properties of the material used to construct its individual elements, one of which is graphite. Graphite is an excellent choice for resistors because of its high level of purity and uniformity, in addition to its excellent ability to dissipate heat. Graphite-Film resistors are designed with a thin graphite-film on a ceramic core substrate. This provides superior heat dissipating properties while simultaneously maintaining exceptional stability.

The L25J25KE series of chassis mount resistors is a great choice when an efficient and reliable resistor is needed in hostile operating environments. Its ability to safely self-destruct in the case of a current overload helps protect expensive and sensitive equipment and components from catastrophic failure.

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