Intrinsically Safe Relays

Intrinsically safe relay – NAMUR intrinsically safe transducers or isolators of binary signal are a basic type of intrinsically safe interface designed to protect electrical circuits installed in potentially hazardous areas. They include electronic components ensuring galvanic isolation of input, output and supply circuits. Mainly are used optocouplers, safety relays, elements with magnetic bind, all in a special desing according to ČSN EN 60079. The input (or output) circuits, whose clamps are connected to wires leading to an hazardous area, are also equipped with protective diode blocks (including Zener diodes) in combination with fuses and resistors. Diodes limit the voltage applied to the intrinsically safe circuit and defect-free limiting resistors limit the maximum current that can flow through the circuit. Intrinsically safe isolators are used as an interface between the intrinsically safe circuits and circuits that are not intrinsically safe. They are made for separation of binary circuits and analog circuits, or only as a source of as an intrinsically safe power without ability to transfer signals.

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