The integrated version of the RA series includes 20 spaces for breakers and a transfer switch in one enclosure. This UL/CSA switch is suitable for standby power systems in residential and light commercial applications. The RA 100 Amp Integrated Load Center Transfer Switch monitors utility power 24 hours a day and 7 days a week. Nema 1 enclosure, rated for indoor installation only. Features: Mechanically interlocked contactor Long-life, high pressure, silver alloy contact resists burning and pitting A powerful and economical solenoid drives the mechanism Neutral and ground bar Fully rated Silver plated copper ground and neutral bus Ease of installation Solderless screw type terminals for esternal power connections Mount flush between wall studs or on wall surface Integrated branch circuit breaker panel 20 spaces, allows 24 circuits with 4 tandem breakers Square D, QW series breaker ccompatible