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What is the difference between a QO342M150 and a QO342MQ150 load center?

The QO342MQ150 (Series S03) has a new style of main circuit breaker installed. The KDL main circuit breaker supplied in Series S01 panels has been replaced by the QDL main circuit breaker. The new style load center requires cover QOC342MQF (flush application) or QOC342MQS (surface application).

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