Square D™ load center surge protective devices, SSP04EMA12S 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™ load center 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, NEMA-4X.