DS/EN 61166:1994 High-voltage alternating current circuit-breakers - Guide for seismic qualification of high-voltage alternating current circuit-breakers
This European Standard specifies seismic severity levels and gives a choice of methods that can be applied to demonstrate the performance of HV circuit breakers for which seismic qualification is required.
DS/EN 61166:1994 history
1994DS/EN 61166:1994 High-voltage alternating current circuit-breakers - Guide for seismic qualification of high-voltage alternating current circuit-breakers