Square D™ loadcentre surge protective devices, TVS4IMA16O, are easy to install plug-in units that install as quickly as a standard circuit breaker. The surge suppressors use two pole spaces in a QO™ or Homeline™ loadcentre, or NQ panelboard. US and Canadian UL® Listed as Type 2 SPD to the UL 1449 standard. Complies with requirements of NEC® Article 285, CSA 233.1-87, and CSA C22.2 No. 8- M1986 as appropriate.