An intrinsically safe process control device comprising: a regulated rail (504, 620); a ground rail (506, 610); a device component (110, 202, 203, 304) electrically coupled to both the regulated rail (404, 504, 620) and the ground rail (506, 610), wherein a voltage applied across the regulated rail and the ground rail causes energy to be stored in the device component; and three or more voltage limiting regulators (108, 208, 312, 500, 602, 604, 606), each voltage limiting regulator disposed in parallel with the device component (110, 202, 203, 304) and each voltage limiting regulator including: a shunt regulator component (112, 210, 314, 502) configured to clamp the voltage across the regulated rail (504, 620) and the ground rail (506, 610) to a safety clamp voltage value, characterised in that each voltage limiting regulator further includes: one or more resistors, wherein the resistance of each of the one or more resistors (403, 508) is selected to configure the safety clamp voltage value; a transistor component; a power sharing resistor configured to limit the power dissipated across the transistor component; a managing resistor configured to prevent the transistor component from amplifying the current from the regulated rail when the voltage across the regulated rail and the ground rail is below a threshold; a power limiting resistor configured to limit the power dissipated across the shunt regulator component; wherein: said power sharing resistor has a first terminal coupled to the regulated rail; said managing resistor has a first terminal coupled to the regulated rail; said power limiting resistor has a first terminal coupled to a second terminal of the managing resistor, and has a second terminal coupled to a cathode side of the shunt regulator component; and said transistor component has an emitter coupled to a second terminal of the power sharing resistor, a collector coupled to the ground rail, and a base coupled to the second terminal of the managing resistor and the first terminal of the power limiting resistor. a regulated rail (504, 620); a ground rail (506, 610); a device component (110, 202, 203, 304) electrically coupled to both the regulated rail (404, 504, 620) and the ground rail (506, 610), wherein a voltage applied across the regulated rail and the ground rail causes energy to be stored in the device component; and three or more voltage limiting regulators (108, 208, 312, 500, 602, 604, 606), each voltage limiting regulator disposed in parallel with the device component (110, 202, 203, 304) and each voltage limiting regulator including: a shunt regulator component (112, 210, 314, 502) configured to clamp the voltage across the regulated rail (504, 620) and the ground rail (506, 610) to a safety clamp voltage value, characterised in that each voltage limiting regulator further includes: one or more resistors, wherein the resistance of each of the one or more resistors (403, 508) is selected to configure the safety clamp voltage value; a transistor component; a power sharing resistor configured to limit the power dissipated across the transistor component; a managing resistor configured to prevent the transistor component from amplifying the current from the regulated rail when the voltage across the regulated rail and the ground rail is below a threshold; a power limiting resistor configured to limit the power dissipated across the shunt regulator component; one or more resistors, wherein the resistance of each of the one or more resistors (403, 508) is selected to configure the safety clamp voltage value; a transistor component; a power sharing resistor configured to limit the power dissipated across the transistor component; a managing resistor configured to prevent the transistor component from amplifying the current from the regulated rail when the voltage across the regulated rail and the ground rail is below a threshold; a power limiting resistor configured to limit the power dissipated across the shunt regulator component; wherein: said power sharing resistor has a first terminal coupled to the regulated rail; said managing resistor has a first terminal coupled to the regulated rail; said power limiting resistor has a first terminal coupled to a second terminal of the managing resistor, and has a second terminal coupled to a cathode side of the shunt regulator component; and said transistor component has an emitter coupled to a second terminal of the power sharing resistor, a collector coupled to the ground rail, and a base coupled to the second terminal of the managing resistor and the first terminal of the power limiting resistor. said power sharing resistor has a first terminal coupled to the regulated rail; said managing resistor has a first terminal coupled to the regulated rail; said power limiting resistor has a first terminal coupled to a second terminal of the managing resistor, and has a second terminal coupled to a cathode side of the shunt regulator component; and said transistor component has an emitter coupled to a second terminal of the power sharing resistor, a collector coupled to the ground rail, and a base coupled to the second terminal of the managing resistor and the first terminal of the power limiting resistor.