UL489 or UL1077 DIN Rail Circuit Breakers

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asi-ez.com Branch or Supplemental Circuit Protection? UL489 or UL1077 Circuit Breakers? What You Need to Know to pick the correct circuit protection for your application.

asi-ez.com Branch or Supplemental Circuit Protection? UL489 or UL1077 Circuit Breakers? What You Need to Know to pick the correct circuit protection for your application.

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  • 1. UL489 or UL1077 What you need to know to ensure you have the right circuit protection for your application By: Richard Goodhart, Product Manager Automation Systems Interconnect rgoodhart@asi-ez.com www.asi-ez.com 877-650-5160 1
  • 2. UL489 Branch Protection UL489 Listed www.asi-ez.com 877-650-5160 2
  • 3. “Branch circuitUL489 protection refers to circuit protection at the panel box” - Kenneth Cybart, Electronic Design www.asi-ez.com 877-650-5160 3
  • 4. UL489 Applications:  Control Panels  Panel-Boards  Switchboards  Motor Control Centers www.asi-ez.com 877-650-5160 4
  • 5. UL489Required for:- Convenience receptacle circuits (internal or external)- External load circuit leaving the equipment- Motors in equipment- HACR equipment (heating, air Conditioning and Refrigeration) www.asi-ez.com 877-650-5160 5
  • 6. UL1077 Supplemental Protection UL1077 Recognized www.asi-ez.com 877-650-5160 6
  • 7. UL1077 “supplementary overcurrent protective device is intended to provide limited overcurrent protection for specific applications and equipment” – UL Reference: Supplementary Protection or Branch Circuit Overcurrent Device www.asi-ez.com 877-650-5160 7
  • 8. UL1077 Applications:  Control Circuits  Power Transformers  Relays  PLC I/O Points  Lighting Circuits www.asi-ez.com 877-650-5160 8
  • 9. Applications:UL1077  Provides additional protection for sensitive electronics  Load side branch protection: Computers and microprocessors, Communication equipment, Electronic controllers, Power supplies, and Many other types of equipment  Motor control circuit without transformers in circuit per NEC 430-72 www.asi-ez.com 877-650-5160 9
  • 10. UL1077GreatReplacementfor Fuses! www.asi-ez.com 877-650-5160 10
  • 11. UL1077UL1077 Circuit Breaker(Supplemental) Cannot Be Used in Place of a UL489 Circuit Breaker (Branch) www.asi-ez.com 877-650-5160 11
  • 12. Application Example UL489 Miniature Circuit Breaker Feeder Circuit (MCB) UL1077 MCB OutletComputer UL489 MCB UL1077 MCB UL489 MCB External Power Motor Supply UL1077 MCB Communication Heating UL489 MCB Equipment Unit www.asi-ez.com 877-650-5160 12
  • 13. Contact US For More Circuit Breaker Information: asi-ez.com 877-650-5160 sales@asi-ez.comwww.asi-ez.com 877-650-5160 13