SMA: Disconnect Unit
SMA has announced the availability of its Disconnect Unit, which provides additional safety and increased serviceability to any large-scale PV system. SMA’s UL-Certified Disconnect Unit fully complies with NEC 2011 safety standards and is compatible with Sunny Central inverters in 600V to 1000V arrays. 
The Disconnect Unit provides maximum safety by disconnecting the direct current (DC) input and alternating current (AC) output from the inverter in case of maintenance or emergency. Load-break switches are mounted on a single switchboard, working under full load conditions and ampacity reserves required by NEC 2011. Lockable switch handles are located on the front of the cabinet, making it easy to identify switch status.
By housing both the DC and AC disconnecting means in one enclosure, scheduled maintenance is easier and more efficient.
The SMA Disconnect Unit can be configured with Sunny Central inverters, including those from the High Efficiency and Compact Power lines. Applicable models include the Sunny Central 250-US and 500-US, 500HE-US/CA, 500CP/630CP/720CP/760CP and 800CP. A Sunny Central inverter and Disconnect Unit can be specified together for independent installation or as part of the SMA MV Power Platform pre-packaged solution.
The SMA Disconnect Unit is available with optional AC load-break-rated disconnect switches for use with the Sunny Central 250-US and 500-US, or with optional AC circuit breakers for use with the Sunny Central 500HE-US/CA and Compact Power line of inverters.
Additional SMA Disconnect Unit attributes include a NEMA 3R-rated enclosure; operating temperatures of -25 C to 50 C; and a lock-out, tag-out safety system. It also is extendable to up to six switch-disconnectors and is available with or without AC disconnecting means.
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