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Power Distribution Units Branch Circuit Functions and Protection

From Eaton-ePDU®
 

 
In the interest of saving space and reducing costs, some designers of power distribution/power controllers select fuses as opposed to electro-magnetic circuit breakers as a method of circuit protection. While there is little dispute that fuses can be substituted as over-current protection devices in place of more expensive, and larger circuit breakers, the purchaser of these power controllers must also consider the overall protection reliability of the system design and the total cost of ownership. Both devices will react to a current overload condition in approximately the same time (around one-half of a 60 Hz A.C. cycle) and both can be specified with comparable over-current trip limits. Also, if properly designed, both over-current protection devices will protect both local and upstream circuits. Power distribution units conforming to UL60950 or UL60950-1 standards must use circuit breakers or fuses rated as 'Branch Circuit Protectors' according to NEC or UL listing.
Products & Services
Power transformers convert power-level voltages from one level or phase configuration to another.  They can include features for electrical isolation, power distribution, and control and instrumentation applications. Search by Specification | Learn more about Power Transformers
Power strips are used in applications where multiple AC outlets are needed, often without surge or line noise protection. Search by Specification | Learn more about Power Strips
Toroidal transformers typically consist of copper wire wrapped around a cylindrical core. This design prevents the magnetic flux that occurs within the coil from leaking. Search by Specification | Learn more about Toroidal Transformers
Power distribution units (PDUs) have an electrical input and several outputs, often as electrical outlets, for powering multiple devices.  Search by Specification | Learn more about Power Distribution Units (PDU)
Product Announcements
Automationdirect.com - Industrial Fuses, Fuse Holders, Fuse Blocks -
Save up to 50% on time-delay & fast-acting fuses. New higher amp current limiting fuses are rated from 200-600 Amps. All fuses are cross referenced as replacements for name-brand fuses like... (read more)
Moeller Electric Corporation - Miniature Branch Molded Case Circuit Breakers
For applications requiring a primary protective device, Moeller Electric introduces its "new" FAZ line of circuit breakers. Ideal for the protection of power supplies, control power transformers, HVAC... (read more)
ABB Low Voltage Products & Systems - (49s) New, UL489, Ring Tongue, Miniature Breakers
New UL489 listed ProM miniature breakers are smaller, faster, & current limiting. UL & NEC branch circuit protective devices for res. & ind. Loads. ABB S280U breakers offer MCCB protection... (read more)
ABB Low Voltage Products & Systems - (29b)Faster, Safer, Smaller UL489 MCCB Breakers
ABB's latest breaker innovation delivers a new range of UL489 listed MCCB circuit breakers, up to 1200A, providing the lowest let-through, the highest interrupting capacities, in the smallest package. (read more)
Ferraz Shawmut - Medium Voltage Fuses
Ferraz Shawmut offers medium voltage fuses in a full range of ratings and configurations to meet today's most demanding medium voltage applications. (read more)
Megger - Programma MJÖLNER200
Programma MJÖLNER200 Microhmmeter • Specifically designed for measuring contact resistances in circuit breakers, disconnecting switches, bus-bar joints, • Safer testing using the patented... (read more)
ASI/Automation Systems Interconnect, Inc. - UL1077 Supplementary Circuit Breakers
ASI offers new line of UL1077 circuit breakers. The new circuit breaker product line includes standard UL 1077 supplemental protectors with ratings ranging from 1 amp to 63 amps, high current versions... (read more)
 
Topics of Interest
In the interest of saving space and reducing costs, some designers of power distribution/power controllers select fuses as opposed to electro-magnetic circuit breakers as a method of circuit... (Read More)
5.1 General Very high current levels in electrical power systems are usually caused by faults on the system. These currents can be used to determine the presence of faults and operate protection... (Read More)
11.1 INTRODUCTION Fuses act as a weak link in a circuit. They reliably rupture and isolate the faulty circuit under overload and short circuit fault conditions so that equipment and personnel are... (Read More)
In medium voltage (3-36 kV) power system applications, recent trends in both international and Indian markets show that conventional types like oil, air and SF6 circuit breakers are being mostly... (Read More)
4.8 POWER STRATEGY Communications systems are typically powered by –48 V DC power supply. This power is then down- (and/or up-) converted to 5, 3.2, or other voltages, as electronic and optical... (Read More)
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