Herrenknecht AG – Leading Manufacturer of Tunnel Boring Machines

Circuit Breakers and Contactors with UL Certification in Tunnel Boring Machines

Requirements

Protection and switching devices for the 480 V on-board power supply system with 60 Hz and a max. short circuit current of 65 kA

Switching devices for wye-delta starter

Protective devices for protection of the entire tunnel boring machine

High supply and product quality, comprehensive consulting services and documentation

Solution

Protection of all pump and drive motors with SENTRON 3VL compact circuit breakers

Wye-delta switching with SIRIUS 3RT contactors

Protection of the complete hydro shield with SENTRON 3WL air circuit breakers

SIRIUS 3RV motor controllers as "Manual Self Protected Combination Motor Controllers", Type E

Added value

Structured device documentation

Reliable UL conformity: the order specifications were accurately complied with

Comprehensive consulting services

Easy retrofitting of circuit breakers with electronic trip units or communication module for direct PROFIBUS connection

Uniform design through identical construction of IEC/UL devices