Eaton MTL7728+ Zener Barrier

The Eaton Crouse-Hinds series MTL7728+ is an intrinsically safe shunt-diode Zener barrier engineered to protect electrical circuits in explosive and hazardous process environments. Designed for hazardous locations across oil, gas, and chemical refining facilities, the MTL7728+ diverts excess electrical energy safely to ground, preventing ignition in potentially explosive atmospheres.

Optimized for analogue and digital control systems, this DIN-rail-mounted barrier operates at a rated supply voltage of 28 Vdc with a switching current limit of 93 mA and positive (+) polarity. Featuring a slim 12.6 mm polycarbonate housing, it provides high-density panel mounting, simple wire termination, and reliable continuous operation across ambient field temperatures ranging from -20°C to +60°C.

Key Features:

✅ Certified for ATEX/IECEx Zone 0 and Zone 2, and Class I, Division 2 / Zone 2 hazardous locations
✅ Direct DIN rail mounting for quick, organized control cabinet integration
✅ Compact 12.6 mm polycarbonate housing rated IP20 for panel protection
✅ Rated supply voltage of 28 Vdc (DC power supply compatible)
✅ 93 mA maximum switching current limit
✅ Positive (+) polarity configuration for loop-powered devices
✅ Designed specifically for controller outputs and hazardous-area solenoids
✅ Wide ambient operating temperature window from -20°C to +60°C
✅ High-density module footprint weighing only 140 g

📦 Package Options:

🔹 Standard Unit: Eaton MTL7728+ Zener Barrier (Single Unit)
🔹 Multi-Pack: Eaton MTL7728+ Multi-Channel Pack for High-Density DIN Rail Enclosures
🔹 Enclosure Assembly: MTL7728+ Pre-assembled in Hazardous-Area Field Junction Box
🔹 Grounding Kit: MTL7728+ with Earth Rail & Insulating Mounting Accessories

Eaton MTL7728+ Zener Barrier Technical Specifications:

Feature	Details
Product Name	Eaton Crouse-Hinds series MTL7700 Zener barrier
Catalog Number	MTL7728+
EAN / Barcode	3066227675743
Typical Application	Analogue / Digital (Controller outputs, solenoids)
Rated Supply Voltage	28 Vdc
Power Supply Type	DC
Switching Current	93 mA
Polarity	Positive (+)
Mounting Method	DIN rail
Housing Material	Polycarbonate
Ingress Protection (IP)	IP20
Operating Temperature	-20°C to +60°C
NEC Hazardous Ratings	Class I, Division 2; Class I, Zone 2
ATEX / IECEx Ratings	Zone 0, Zone 2
Standards	IECEx/ATEX, NEC/CEC, IEC
Dimensions (L x H x W)	105 mm x 90 mm x 12.6 mm
Weight	140 g

Certifications & Compliance:

🔗 ATEX / IECEx Zone 0 & Zone 2 – Intrinsically safe barrier certified for connection into Zone 0 explosive gas atmospheres and installation in Zone 2 locations
🔗 NEC / CEC Class I, Div 2 & Class I, Zone 2 – Certified for North American hazardous classified installations
🔗 Polycarbonate Enclosure – Rugged flame-retardant industrial housing suitable for -20°C to +60°C field environments
🔗 crouse-hinds-mtl7700-range-datasheet
🔗 Download Datasheet

Applications of Eaton MTL7728+ Zener Barrier:

🔹 Oil & Gas
🔹 Chemical Plants
🔹 Mining
🔹 Labs
🔹 Manufacturing

What’s in the Box?

📦 1x Eaton MTL7728+ Zener Barrier
📦 1x Removable Terminal Tagging Strip
📦 1x DIN Rail Grounding Clip Assembly
📦 1x Quick Start Installation Guide
📦 1x MTL7700 Range ATEX Safety Instruction Sheet
📦 1x Factory Quality Inspection Certificate
📦 1x Manufacturer Warranty Documentation

Ordering & Shipping Details

📦 Lead Time: 2 - 3 weeks
📍 Shipping Terms: Worldwide / Expedited Options
💳 Payment Options: Credit Card, PayPal, Net 30 Terms

Related Products:

🔗 Eaton MTL7787+ Zener Barrier (Dual Channel 28V)
🔗 Eaton MTL5500 Series Galvanic Isolator Modules
🔗 Standard 35mm DIN Rail & Earth Bar Mounting Kit

FAQs:

What is the primary function of the Eaton MTL7728+?
The MTL7728+ is an intrinsically safe shunt-diode Zener barrier that restricts electrical and thermal energy entering hazardous explosive zones, typically used for driving solenoids and controller outputs.

What hazardous areas can the MTL7728+ interface with?
It is certified to interface with field equipment situated in ATEX/IECEx Zone 0, Zone 2, and Class I, Div 2 / Zone 2 locations.

What are the operational voltage and current ratings for this barrier?
The MTL7728+ features a rated supply voltage of 28 Vdc and a maximum switching current of 93 mA with positive polarity.

How is the MTL7728+ mounted and grounded?
The unit mounts directly onto standard industrial 35 mm DIN rails, using an integrated conductive foot for grounding and bonding to the intrinsically safe earth busbar.