Mini Circuit Breakers

  • Eaton UL489 Circuit Breakers
  • Eaton UL1077 Circuit Breakers

Industrial UL1077 and UL489 Circuit Breakers play an important part in any industrial control panel or automation system.  These mini circuit breakers are best suited for protection of branch circuits and individual supplemental circuit protection for specific devices.  UL489 Circuit Breakers can be used as a low cost alternative to their larger counter part the Molded Case Circuit Breaker.  We have many brands to choose from including Eaton, WEG, and C3 Controls.

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UL1077 & UL489 Circuit Breaker Features:

  • Din Rail Mounting!
  • Industrial Circuit Breakers ranging from 0.5amp to 63amp
  • Mini Circuit Breakers in 1-Pole, 2-Pole, and 3-Pole
  • B-Curve(3-5x Amps), C-Curve(5-10x Amps), and D-Curve(10-20x Amps)  
  • UL1077 Supplemental Protectors Available by Request a Quote
  • UL489 Mini Circuit Breakers Available by Request a Quote

UL1077 & UL489 Circuit Breakers Explained

In the world of industrial circuit breakers there are two primary miniature circuit breaker classifications.  The first is UL1077 which cover what they refer to as supplemental protectors.  Supplemental protectors are not allowed to be used as a feeder circuit breaker or as a branch circuit breaker.  Their intend use is to be used within a branch circuit to protect individual devices such as control circuits, PLC’s, and other supplemental components.  The second and more common is the UL489 Mini Circuit Breakers.  These look very similar to their UL1077 variant but these mini circuit breakers have been rated for use as branch circuit protective device.  The key thing to take away from this is that UL489 Mini Circuit Breakers are very close in size to the UL1077 Supplemental Protectors and a UL489 Circuit Breaker can be used in any UL1077 application but you cannot use a UL1077 supplemental protector in the place of a UL489 mini circuit breaker.

Trip Curves Explained

B-Curve = 3-5x Inrush Current
B-Curve Mini Circuit Breakers are best suited for resistive loads and/or low inductive loads such as lighting circuits and control circuits
C-Curve = 5-10x Inrush Current
C-Curve Mini Circuit Breakers are best suited for general purpose inductive loads such as general use electric motors.
D-Curve = 10-20x Inrush Current
D-Curve Mini Circuit Breakers are best suited to handle high inrush induction loads such as electric motors starting under full load as well as the protection of transformers
 

EATON Miniature Circuit Breakers

We carry a full line of Eaton Mini Circuit Breakers in both UL1077 and UL489.  The Eaton Mini Circuit Breakers come in 1-pole, 2-pole, and 3-pole with options for trip indication, auxiliary contacts as well as neutral poles.  The Eaton FAZ and WMZ line of Mini Circuit Breakers are available from 0.5amp to 63amp in multiple trip curves.
 

WEG Miniature Circuit Breakers

We carry a full line of WEG Mini Circuit Breakers in both UL1077 and UL489.  The WEG Mini Circuit Breakers come in 1-pole, 2-pole, and 3-pole with options for trip indication and auxiliary contacts.  The WEG line of Mini Circuit Breakers are available from 0.5amp to 63amp in multiple trip curves.
 

C3 Controls Miniature Circuit Breakers

We carry a full line of C3 Controls Mini Circuit Breakers in both UL1077 and UL489.  The C3 Controls Mini Circuit Breakers come in 1-pole, 2-pole, and 3-pole with options for trip indication and auxiliary contacts.  The C3 Controls line of Mini Circuit Breakers are available from 0.5amp to 63amp in multiple trip curves.
 

Enclosed Motor Starters and Industrial Control Panels

Did you know we have a full UL508a Control Panel Shop?  We offer customers the options they need to control their application in the way they see fit!  Our UL508a Industrial Control Panel Shop has an Engineering Team ready to assist you with designs for any application whether its simply enclosing mini circuit breakers to form a load center or build a full machine control panel.