Active Member
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[China]
Address: UNIT 04,7/F BRIGHT WAY TOWER NO.33 MONG KOK RD KL
Contact name:Steven
ASIA SCIENCE&TECHNOLOGY COMPANY LIMITED |
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►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
►Description
Model MTL7787+ 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.
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.)
| ►Specification | |
| Ordering Code | MTL7787+ |
| Safety Description: | |
| Maximum voltage of Zener diode when fuse blows | 28V |
| Minimum value of terminating resistor | 300Ω |
| Maximum short-circuit current | 93mA |
| Number of Channels | 2 |
| Maximum end-to-end resistance | 333Ω |
| Working Voltage | 26.6V |
| Maximum Voltage | 27.2V |
| Fuse Rating (continuous) | 50mA |
| 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 |
