Plastic housing products now are available in a range of 15 to 240 W of output power. A variety of output voltages are available between 5 and 56 Vdc, with efficiency ratings up to 95.2%. Units using spring clamp and screw terminals are offered. Additional features available on some models include dc-ok contacts, -40 °C fully rated units and conformal coated units for harsh environments. For critical applications, redundancy modules are available for increased system reliability. All units are UL- and cUL-listed with CE approval. Most units also carry Class I, Div. 2 and NEC Class 2 approval.