SPJ-5K400

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Fuses are an important part of most electrical systems. They protect against overcurrents which can lead to equipment damage and fire hazards. SPJ-5K400 is a type of specialty fuse specifically designed for low voltage or solar applications. It is UL Recognized and CSA Certified for use in noisy environments.

SPJ-5K400 is a single element, axial leaded fuse rated at 500VAC, with an interrupt rating of 10kA. Its time-delay feature limits the inrush current of capacitive or inductive loads. It can be used in applications such as circuit protection in solar inverters, UPS systems, and DC/DC converters.

The internal construction of the SPJ-5K400 consists of a silver-plated copper element encapsulated in epoxy resin. The encapsulation is done in a sealed environment to ensure it can withstand an external shock of up to 6g. The fuse is also resistant to mechanical shock and vibration up to 250g and 20-100Hz.

The SPJ-5K400 has an electro-mechanical design which allows for its current-limiting characteristics. Basically, it has a contact system made up of two cooperating contact probes that are connected to a pair of electrodynamic coils. When an overcurrent occurs, the coils generate a magnetic field which causes an armature to move in between the contact probes. The armature then acts as a short circuit, limiting the current so as to prevent the unprotected circuit from being damaged due to an overcurrent.

The fuse also features an anti-reverse protection mechanism, which prevents the inrush current in the circuit from damaging the fuse in the event of a device or circuit fault. This is achieved by adding a second contact between the two probes, which breaks the contact when negative voltage is applied. This ensures the fuse does not blow in the opposite direction and prevents further damage by limiting the current.

In conclusion, the SPJ-5K400 one-element axial leaded fuse is an electrical specialty fuse which is specially designed for low voltage or solar applications. Its time-delay feature helps to limit the inrush current, and its electro-mechanical design and anti-reverse protection mechanism provide extra safety in the event of a device or circuit failure. With its UL Recognized and CSA Certified status, it is a reliable and cost-effective option for circuit protection.

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