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Medium voltage circuit breaker operating sequence

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Rated switching sequence according to IEC, O – t – CO – t’ – CO. (cf. opposite diagram):

O – Represents opening operation
CO – Represents closing operation followed immediately by an opening operation

Three rated operating sequences exist:

  • Slow: O – 3 min – CO – 3 min – CO
  • Fast 1: O – 0.3 s – CO – 3 min – CO
  • Fast 2: O – 0.3 s – CO – 15 s – CO

NOTE: Other sequences can be requested from manufacturer.

Close/Open cycle

Assumption: O order as soon as the circuit breaker is closed

Close/Open cycle of medium voltage circuit breaker
Close/Open cycle of medium voltage circuit breaker

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Automatic reclosing cycle

Assumption: C order as soon as the circuit breaker is open, (with time delay to achieve 0.3 s or 15 s or 3 min).

Automatic reclosing cycle of medium voltage circuit breaker
Automatic reclosing cycle of medium voltage circuit breaker
SOURCE: Schneider Electric – Medium Voltage Technical Guide

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Edvard Csanyi

Edvard - Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry fascilities. Professional in AutoCAD programming. Present on