Line of power supplies meets functional safety applications up to Safety Integrity Level (SIL) 3. Model Quint 20+ power supply has an integrated decoupling Mosfet and double overvoltage protection circuitry to meet rigorous SIL 3 safety regulations without the need for external redundancy. The power supply has with ATEX, IECEx and Class I, Division 2 approvals, which allows the power supply to be mounted within potentially explosive areas (Zone 2). The functional safety approval allows the power supply to be used in applications up to SIL 3, according to IEC 61508. The safety function is to limit the output voltage to 30 V DC, and if higher, to switch off within 20 msec. The safe state is no output voltage. Designed with double overvoltage circuitry, the power supply also has a hardware fault tolerance (HFT) of 1.