Residual current device PR 303 3P 125 A with adjustable trip range 300-1000 mA, Type F (HPI), DX3 series 410612

Safety and Reliability in Your Electrical Installation

The residual current device PR 303 3P 125 A with adjustable trip current 300–1000 mA (product code: 300-1000), Type F (HPI), DX3 series, is a critical component ensuring protection of people and equipment in electrical installations. Designed for demanding applications, it offers high operational effectiveness and immunity to interference. This is the ideal solution for both professional installers and end-users who value safety and comfort.

Functionality and Applications

This three-pole residual current device with a rated current of 125 A is intended to protect circuits against the effects of earth leakage currents and earth faults. Adjustable residual current settings from 300–1000 mA (product code: 300-1000) allow precise tuning to the specific characteristics of the protected installation. Type F (HPI) ensures immunity to electromagnetic interference, which is especially important in industrial environments or where power supply is unstable. This minimizes the risk of unwanted tripping, guaranteeing uninterrupted power supply.

• Versatile application: Ideal for protecting circuits in residential, commercial, and industrial buildings.
• Protection against electric shock: Effectively prevents electric shock in case of insulation damage or direct contact with live conductors.
• Fire prevention: Reduces the risk of fire caused by earth faults.
• Sensitivity adjustment: Ability to customize the residual current threshold to specific installation requirements.
• Immunity to interference: HPI type ensures stable operation even under severe electromagnetic conditions.

Design and Technical Specifications

The PR 303 DX3 device features a robust construction and high manufacturing quality. The rated insulation voltage Ui is 500 V, and the rated impulse withstand voltage Uimp is 6 kV, ensuring reliable operation even during voltage surges. The device supports connection of single-core cables from 1.5 to 70 mm² and multi-core cables from 1.5 to 50 mm², providing installation flexibility. Additionally, it includes a lock to prevent accidental opening of the enclosure, enhancing user safety. Operating temperature range from -25°C to 70°C allows use in diverse environmental conditions. Importantly, it features protection against unintended tripping—a crucial aspect for ensuring continuous operation. The IP20 protection rating provides protection against finger contact and solid objects larger than 12.5 mm—standard for devices mounted inside distribution board enclosures.