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Home ProductsMTL 7700 Series Zener Barriers

MTL7787+ Zener Barrier

MTL7787+ Zener Barrier

MTL7787+ Zener Barrier

Product Details:

Place of Origin: UK
Brand Name: MTL
Model Number: MTL7787+

Payment & Shipping Terms:

Minimum Order Quantity: 1pc
Price: according to the purchase quantity
Packaging Details: carton
Delivery Time: in stock
Payment Terms: T/T
Supply Ability: 100pcs
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Detailed Product Description

MTL7787+ Zener Barrier

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

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.)

Ordering Code  MTL7787+
Safety Description:
Maximum voltage of Zener diode when fuse
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


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