Delta inverters now UL-certified for rapid shutdown

Tigo Energy announced the new Underwriter Laboratories (UL) certification of its TS4 Platform Rapid Shutdown Systems (RSS) with Delta Group, a global leader in power and thermal management solutions. The Delta inverters listed below were successfully certified with Tigo’s RSS solutions: TS4-F (Fire Safety)TS4-O (Optimization) and TS4-L (Long String). Tigo is currently shipping with Delta and more Tier 1 certified inverter manufacturing partners throughout the U.S. Contact Tigo for more information about RSS for integrated or retrofitted PV installations.

This UL certification is part of Tigo’s multivendor initiative providing customers with the advantages of reliable, safe and cost-effective solutions. The use of Tigo smart modules and high efficiency inverters allows design flexibility for installers to comply with National Electric Code (NEC) 2017 690.12 RSS regulations. Tigo has also been internationally recognized as the only module-level power electronic vendor with UL-certified RSS with PV module manufacturers. To learn more about Tigo’s RSS solutions, join Tigo’s online NABCEP-accredited trainings.

The following Delta inverters are newly UL-listed as a Rapid Shutdown System with Tigo’s TS4 units:

TS4-F (Fire Safety)

The most cost-effective RSS solution with SunSpec-defined power-line communication.

  • M36U
  • M42U
  • M60U
  • M80U

TS4-O (Optimization) and TS4-L (Long Strings)

The only UL-certified multivendor RSS in the U.S. solar market also include additional features like optimization and long string designs.

  • M4-TL-US
  • M5-TL-US
  • M6-TL-US
  • M8-TL-US

Tigo is currently taking orders — for price and delivery of RSS UL-certified TS4 products, contact +1.408.402.0802 ext. 1,, or consult your preferred solar distributor. For more information about Delta PV inverters, contact or visit

News item from Delta Group

Comments are closed.