937T Isolator Barriers
Allen‑Bradley

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Overview

Our 937T Isolator Barriers include galvanic optical or transformer isolation, these modules provide an interface within the intrinsic safety circuit that is electrically separated from the control system. A key advantage of isolated barriers is that they do not require a ground between the module and the intrinsically safe device. Available in 12.5 mm (0.5 in) and 20mm (0.8 in) widths.

Uses integrated diagnostics for simple maintenance and quick change of modules during ongoing operation
Uses DIP switches or Field Device Tool software for easy configuration
Provides easy and reliable planning and documentation with comprehensive standards compliance up to SIL 3
Offers horizontal or vertical mounting with no reduction in operational ratings
Includes line fault detection for field circuits
Provides power rail for reduced wiring, collective error messaging, and efficient troubleshooting and installation

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.

Applications

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

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Documentation

Technical Specifications	Publication
Bulletin 937 Intrinsic Safety Modules Selection Guide	937-SG001_-EN-P
Isolated and Converter Barriers Specifications	937-TD002_-EN-P
Bulletin 937T Isolator Barriers Certification Information	937T-TD001_-EN-P

Program Guides	Publication
Intrinsic Safety in Class I Div 1 Hazardous Locations Application Technique	937-AT001_-EN-P
Panel Space Optimization Application Technique	937-AT002_-EN-P

Product Profiles	Publication
Bulletin 937 Intrinsic Safety Modules Product Profile	937-PP001_-EN-P

937T Isolator Barriers Allen‑Bradley

937T Isolator Barriers
Allen‑Bradley