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Repetitive means occurring again and again. For example, if a thyristor is rated for 600V repetitive, it means that it can be used in a circuit where up to 600V can be applied to it regularly without damaging it. Here we're talking about damage caused by the voltage. Improper use could still damage it for other reasons even if the voltage stays below 600V.
On the other hand, a non-repetitive rating may be applied only once (or in some cases, only a few times), such as when a circuit is first turned on. As an example, a thyristor may be rated for a continuous current of 5A and a brief non-repetitive surge current of 20A. Non-repetitive usually means that there must be sufficient time for the device to cool down in between surges.
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