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937Z Zener Barriers
Allen-Bradley

Our Bulletin 937Z Zener Barriers provide protection for electrical signals within hazardous areas. These barriers feature a narrow profile of just 12.5 mm to maximize control panel space.
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Our Bulletin 937Z Zener Barriers provide protection for electrical signals within hazardous areas. These barriers feature a narrow profile of just 12.5 mm to maximize control panel space. They also prevent the transfer of unacceptably high energy from the safe area into the hazardous area. Our Zener Barriers include positive polarity, which means the anodes of the Zener diodes are grounded. Depending on the application, increased or decreased intrinsic safety parameters apply for serial or parallel connection.

  • Includes standard DIN rail snap on mounting for easy installation and grounding
  • Includes one- or two-channel barriers, 646 or 327 Ohm maximum resistance
  • Provides diode return feature to prevent a current into the hazardous area
  • Offers a high power version with a smaller serial resistance which provides higher voltage to the field device
  • Uses Zener diodes to limit electrical energy in hazardous environments

Zener Barrier Intrinsic Safety Modules are used in any application with Class 1, Division 1 (Zones 0 and 1) hazardous locations such as:

  • Chemical
  • Petrochemical
  • Oil and Gas

Learn the basics of intrinsic safety circuits and how our Bulletin 937 Intrinsic Safety Modules can provide a cost-effective solution for hazardous location challenges.

Certifications

You can see a list of certifications for the Bulletin 937 Barriers by product number and link to the pdf of the certification document.

Certifications apply when product is marked. See our Product Certification site for Declarations of Conformity, certificates and other certification details. 

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Documentation Chevron DownChevron Down
Technical Specifications Publication
Bulletin 937 Intrinsic Safety Modules Selection Guide 937-SG001_-EN-P
Zener Barriers Specifications 937-TD003_-EN-P
Bulletin 937Z Zener Barriers Certification Information 937Z-TD001_-EN-P
Program Guides Publication
Intrinsic Safety in Class I Div 1 Hazardous Locations Application Technique 937-AT001_-EN-P
Product Profiles Publication
Bulletin 937 Intrinsic Safety Modules Product Profile 937-PP001_-EN-P