Zener Barrier MTL7787+
Features
Simple installation onto standard DIN railing
Removable colour-coded terminals for easy connection, accommodate conductors up to 2.5mm2,
Supports up to two zones of I.S. products
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Description
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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.
Model MTL7787+ 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.
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Specification
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Ordering Code MTL7787+
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Safety Description:
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Maximum voltage of Zener diode when fuse blows
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28V
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Minimum value of terminating resistor
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300Q
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Maximum short-circuit current
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93mA
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Number of Channels
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2
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Maximum end-to-end resistance
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333Q
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Working Voltage
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26.6V
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Maximum Voltage
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27.2V
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Fuse Rating (continuous)
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50mA
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Operating Temperature Range
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-20°C to + 60°C (continuous working)
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Storage Temperature Range
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Maximum Humidity
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95%RH - Non Condensing (at 40°C)
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Weight (g) / Dimensions (mm)
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140 / H90 x W105 x D12.6
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Mounting Method
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DX070 Box
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FURTHER INFORMATION: www.mtl-inst.com
-40°C to + 80°C