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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.
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UL489 or UL1077What you need to know to ensure you have
the right circuit protection for your application
www.asi-ez.com 877-650-5160
By: Richard Goodhart, Product Manager
Automation Systems Interconnect
rgoodhart@asi-ez.com
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Branch Protection
UL489 Listed
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UL489
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“Branch circuit protection refers
to circuit protection at the panel box”
- Kenneth Cybart,
Electronic Design
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UL489
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Applications: Control Panels Panel-Boards Switchboards Motor Control Centers
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UL489
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Required for: - Convenience receptacle circuits (internal or external)
- External load circuit leaving the equipment
- Motors in equipment
- HACR equipment (heating, air Conditioning and Refrigeration)
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UL489
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Supplemental Protection UL1077 Recognized
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UL1077
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“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
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UL1077
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Applications: Control Circuits Power Transformers Relays PLC I/O Points Lighting Circuits
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UL1077
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Applications:
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
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UL1077
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Great Replacement for Fuses!
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UL1077
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UL1077 Circuit Breaker (Supplemental) Cannot Be Used in Place of a UL489 Circuit Breaker (Branch)
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UL1077
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Feeder Circuit UL489 Miniature Circuit Breaker (MCB)
UL489 MCB
Outlet
UL1077 MCBPower Supply
UL1077 MCBComputer
UL489 MCB ExternalMotor
UL489 MCBHeatingUnit
UL1077 MCB CommunicationEquipment
Application Example
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Click icon to add pictureContact US
For More
Circuit Breaker Information:
asi-ez.com 877-650-5160
sales@asi-ez.com
www.asi-ez.com 877-650-5160
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