Series MTL7706/7787 Zener Barrier

Intrinsically Safe Barriers for Hazardous Locations

The Series MTL7706/7787 Zener Barriers are an intrinsically safe shunt-diode barrier that can be used to communicate with and provide isolations for certain Dwyer ® transmitters approved for use in hazardous areas. These barriers limit the amount of energy allowed to pass into the hazardous area, which inhibit ignition in flammable atmospheres.

Product Applications

  • Electrically isolates pressure and level transmitters from unregulated circuits for intrinsically safe applications

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Model Description Usually Ships* Price Order
Ships: Next Day
Price: $613.00
Intrinsically safe zener barrier. Next Day* $613.00 Order
Ships: Next Day
Price: $364.00
Intrinsically safe zener barrier. Next Day* $364.00 Order


Transmitter Voltage:
16.2 V @ 20 mA with 250Ω load (negative w.r.t. earth); 11.0 V @ 20 mA with 500Ω load (negative w.r.t. earth).
Safe Area Output:
4 to 20 mA.
Load Resistance:
0 to 500Ω.
Power Requirement:
20 to 35 VDC w.r.t. earth.
±2 µA under all conditions.
LED Indicator:
Green: Power Indication.
Temperature Limits:
Operating: -4 to 140°F (-20 to 60°C); Storage: -40 to 176°F (-40 to 80°C).
5 to 95% RH.
Accommodate up to 2.5 mm² stranded or single-core.
Safety Description:
28 µV, 300Ω, 93 mA.
4.9 oz (140 g).
Agency Approvals:
See table on Catalog page.


  • Approved for use in hazardous areas

Product Literature


Catalog Pages



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