Mini 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 CurrentB-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