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Archive For: Circuit Protection

Electrical Arcs (Part 2 of a 2 Part Series)

Electrical Arcs (Part 2 of a 2 Part Series)

In Part One of this article we discussed the equipment and procedures used to manage the damaging effects of arcs in electrical equipment. In Part Two, we will discuss some of the basic methods, tools, components and circuits that should be used to operate safely around circuits with high arc potential. Part One can be ... Read More
 
Motors and Drives

Motors and Drives

Premium Efficiency Motors The IronHorse™ general purpose AC motor line now includes cast iron three-phase premium efficiency motors available in horsepower ranges from 1 to 200 hp. Motors are available in speeds of 1200, 1800, and 3600 RPM and are electrically reversible. The three-phase industrial duty T-frame and TC-frame TEFC motors feature ribbed cast iron ... Read More
 
UL 508A Certified Panel Shops

UL 508A Certified Panel Shops

Several member integrators in AutomationDirect’s SIDirect program have UL 508A certified panel shops. Although many installations and applications do not specify adherence to the UL 508A standard, it’s good to be aware of the benefits of UL listing for your control panels. The UL listing mark on an industrial control panel provides evidence of third ... Read More
 
Electrical Arcs (Part 1 of a 2 Part Series)

Electrical Arcs (Part 1 of a 2 Part Series)

Those of us who have worked with, or around, electrical equipment have witnessed electrical arcs. At the very least, we’ve seen the sparks produced when a relay or contactor switches off. Similarly, most of us also know that repetitive arcing can be very damaging to contacts over the long term, requiring periodic replacement of relays ... Read More
 
Fuses or Circuit Breakers: Which should you use?

Fuses or Circuit Breakers: Which should you use?

For most of us who work in the electrical design field, the question of circuit protection is omnipresent in our day-to-day efforts. There are a myriad of circuit protection technologies available that address phenomenon such as high voltage transients, inductive kick-back, capacitive coupling, high inrush currents and ground faults, just to name a few. However, ... Read More
 
Arc Flash: What’s the big deal?

Arc Flash: What’s the big deal?

The subject of arc flash has become a major concern in electrical safety. What exactly is arc flash and how can it be prevented? Arc flash is high temperature conductive plasma formed when a short circuit fault occurs between at least two energized conductors. It occurs when a phase-to-phase fault or phase-to-ground fault causes energized ... Read More
 
Molded Case Circuit Breakers For Electrical Protection

Molded Case Circuit Breakers For Electrical Protection

AutomationDirect now carries a line of Molded Case Circuit Breakers (MCCBs) that offers UL489 listed performance for branch circuit overcurrent protection and disconnecting means. The circuit breakers’ small size saves panel space, compared to standard breakers or comparable fusible devices. The breakers are manufactured under license from Eaton Electrical, Inc., the manufacturer of Cutler-Hammer products. ... Read More