Square D and Homeline are closely related because Homeline is a specific residential product tier manufactured by Square D (under Schneider Electric), but they are not identical. The broader Square D brand encompasses both the elite commercial-grade QO line and the consumer-grade Homeline tier. Homeline products use standard 1-inch spacing and economical materials designed for everyday housing, whereas QO products feature industrial-grade components and compact 3/4-inch sizing.
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