Simple installation onto standard DIN railing
Removable colour-coded terminals for easy connection, accommodate conductors up to 2.5 mm
Input circuitry protected against reverse polarity
Can be used with the IFD-E(IS) industrial IR3 flame detector; Zener Barrier – Data Sheet
Hochiki Shunt Diode Safety Barrier for IFD-E(I.S) (Z728)
Model Z728 is an intrinsically safe, zone-powered, Zener-diode barrier for use in conventional fire detection systems for protection within hazardous areas.
Each Zone contains two stages of pulse-tested Zener or forward- connected diodes and an ‘infallible’ terminating resistor. In the event of an electrical fault in the safe area, the diodes limit the voltage that can reach the hazardous area and the resistor limits the current. A fuse protects the diodes, and the two stages of voltage limitation ensure continued safety if either stage should fail. No active output-current limiting circuits are employed.
The unit is certified ‘ia’ for all zones and ‘IIC’ for all explosive atmospheres.
PLEASE NOTE: The Earth connections to the unit are made via connection to the DIN rail (this product MUST be earthed).
Key Features:
Simple installation onto standard DIN railing
Removable colour-coded terminals for easy connection, accommodate conductors up to 2.5 mm
Input circuitry protected against reverse polarity
Can be used with the IFD-E(IS) industrial IR3 flame detector; Zener Barrier – Data Sheet
