IULNK111-32120-3

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IULNK111-32120-3 is a circuit breaker for medium voltage applications from the IULNK series. This circuit breaker meets the requirements of the ABB IEC 62271 standard and offers reliable protection, switching, and control functions for distribution systems.

The IULNK111-32120-3 consists of a molded-case circuit breaker enclosure with an integrated main contact assembly, trip unit and auxiliary contacts, and a mechanical operating mechanism operated by a handle. The circuit breaker utilizes an advanced air magnetic circuit breaker design that is designed to protect medium voltage systems ranging from 5 kV to 17 kV.

The IULNK111-32120-3 also employs a unique design whereby the air is drawn into the bottom of the circuit breaker enclosure and is directed through the contact connections to the top of the enclosure. This re-directs the thermal energy created by the contacts as the circuit breaker switches. This feature therefore enables the contact temperature to remain at a safe level during operation.

The main operating mechanism is a spring mechanism that utilizes a combination of a sliding contact and an engaging force against the contactor armature. When the current reaches a predetermined level, the armature trips and the contacts are opened. The spring holds the contacts open until the current reaches a safe level, at which point the contacts are automatically closed. The operating mechanism is designed to ensure reliable switching and protection.

The IULNK111-32120-3 is equipped with an auxiliary contact for remote control operation, providing additional service life and temperature protection. The auxiliary contact is calibrated to trip the main operating mechanism at a preset thermal level and is designed to interrupt the current in the event of excessive contact temperature.

The circuit breaker is also equipped with voltage sensitive trip units designed to trip in the event of an overvoltage situation. The trip unit is designed to detect any overvoltage condition and to open the main contactor when the voltage reaches a predetermined level. The trip unit can be reset manually, providing protection against voltage surges.

The IULNK111-32120-3 is designed to provide reliable protection and flexibility in medium voltage applications such as in distribution systems, motor control centers, switchgear applications, and rectifier systems. With its unique temperature protection feature and its voltage sensing trip unit, the circuit breaker offers the user protection and reliability in a range of applications.

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