Abstract: An intrinsically safe safety barrier for attachment to a standard profiled supporting bar, includes a housing having a narrow shell-shaped housing part with narrow sides and wide sides, one of the wide sides being open, a circuit board disposed in the housing part, terminals disposed in the housing part and connected to the circuit board, a potential-compensating bar disposed in the housing part and connected to the circuit board, casting resin filling the housing part after the circuit board, terminals and potential-compensating bar have been inserted therein, and a cover attached to the housing part closing the open side thereof before the casting resin hardens, one of the narrow sides of the housing part having resilient formed-out portions thereon for snapping the housing part to the standard profiled supporting bar, and a method of producing the same.