go to the Air-insulated switchgear product page Anonymous asked on Jan 10th, 2015 in Air-insulated switchgear

What are the seismic capability of LTB and HPL circuit breaker?

Alberto Zulati, Global Product Manager PASS

ABB's answer

All standard versions of HPL- and LTB- circuit breaker can withstand seismic  acceleration below 0.3 g in accordance with IEC 62271-300 and belowe 0.3 g in accordance with IEEE 693. In order to withstand higher earthquake stresses the circuit breaker may be provided with reinforced support structure and/or reinforced insulator, earthquake dampers may be applied on large circuit breaker.

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  • Helene Hedlund

    Helene Hedlund

    Global Product Manager LTB

    High Voltage Products

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