Cummins RA400 400A Service-Entrance Automatic Transfer Switch

At a glance

Amperage

400 A continuous

Poles

2-pole

Voltage

120/240 VAC

Phase / Frequency

Single phase, 60 Hz

Service Entrance Rated

Yes (UL 489 listed circuit breaker)

Withstand/Closing Rating (WCR)

35 kA at 240 VAC and below

Enclosure

NEMA Type 3R, aluminum (indoor/outdoor)

Dimensions (H x W x D)

48 in x 23.4 in x 10.5 in (1220 x 594 x 267 mm)

Weight

95.6 lb (43.4 kg)

Transfer Time

Will not exceed 100 ms (source-to-source)

Listings

UL 1008 and CSA C22.5 No. 178.1

Warranty

2-Year Limited (parts & labor)

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Why this generator

• Service-entrance-rated 400-amp automatic transfer switch with an integrated UL 489 listed circuit breaker, eliminating the need for a separate service disconnect
• Dual-certified to UL 1008 and CSA C22.5 No. 178.1 for transfer switch safety, with a robust 35 kA short-circuit withstand and closing rating at 240 VAC
• Purpose-built to pair with Cummins Quiet Connect RS-series home standby generators (RS13A through RS50) for a simplified, faster outdoor installation
• Weatherproof NEMA Type 3R aluminum enclosure with a secure front for protection from the elements and vandals
• Monitors utility power 24/7 and automatically transfers the whole-home load to generator power and back, with no homeowner action required and fast sub-100 ms transfer
• Mechanically and electrically interlocked, break-before-make contactor with long-life silver-alloy contacts that resist burning and pitting; backed by a 2-year parts-and-labor warranty

Frequently asked questions