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Vigilant Safety Barrier 28V + VE (MTL7728+)
$781.49
Vigilant Safety Barrier 28V + VE (MTL7728+)
SKU
MTL7728
Model MTL7728+ is an intrinsically safe, zone-powered for use in conventional fire detection systems for protection within hazardous areas.
Each Zone contains two stages of 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.
Model MTL7728+ is certified 'ia' for all zones and 'IIC' for all explosive atmospheres.
Maximum voltage of Zener diode when fuse blows 28 V
Minimum value of terminating resistor 300
Maximum short-circuit current 93 mA
Number of Channels 2
Maximum end-to-end resistance 333
Working Voltage 25.9 V
Maximum Voltage 26.5 V
Fuse Rating (continuous) 50 mA
Operating Temperature Range -20 °C to + 60 °C (continuous working)
Storage Temperature Range -40 °C to + 80 °C
Maximum Humidity 95%RH - Non Condensing (at 40 °C)
Weight (g) / Dimensions (mm) 140 / H90 x W105 x D12.6
Mounting Method DX070 Box, SMB-2 or SMB-3 Enclosures