QSPD2A035B SIEMENS LOW VOLTAGE SURGE PROTECTION DEVICE (SPD). PLUG- ON SPD MODULE FOR LOAD CENTER WITH 2-POLE Q FRAME MAIN CIRCUIT BREAKERS. SUITABLE FOR 120/240V 1-PHASE 3-WIRE VOLTAGE SYSTEMS. 35kA PER PHASE SURGE CAPABILITY. SPECIAL FEATURES: BASE MODEL (NO LED / NO AUDIBLE ALARM)