- NOVA V3 the ultimate in Proximity Sensing. Hermetically sealed, non incendive switching up to 5 Amp up to 250 V - SMART SWITCH This technology is available in most SOLDO control boxes, meeting the demands for increased technology, one touch calibration with on board diagnostics - NOVA BOLT The "Snap Acting Proximity Sensor" designed to meet EExdIIC and ClassI, ClassII Div1 Groups A-G(UL/CSA) applications, capable of switching up to 5 Amp at up to 250 V