Circuit & System Protection


Latest Articles

Zero phase current transformer for earth leakage
25 September 2002
The TZ 2.5 zero phase current transformer is a new development by Tae Hwa. Its major application is for earth leakage circuit breakers with the additional requirement included of a secondary winding for ...

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Spark gaps
25 September 2002
The spark gap SGP from Citel is designed to prevent earth potential differences between equipment and structures (metal pylon, pipes) that are connected to different earthing points, due to lightning ...

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Lack of lightning protection expensive
25 September 2002
The lack of protection against lightning and installation of incorrect lightning protection equipment is proving expensive in terms of breakdown and replacement costs for the local telecommunications ...

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Current transformers for protection
25 September 2002
A range of current transformers for Class 2 applications are available through local company Hillcor Holdings. Manufactured by Tae Hwa, the range covers from 10 to 100 A rated current. Applications are: ...

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PCB fuseholder
25 September 2002, Actum
Developed specifically for use on PCBs, Pudenz's 'FLR-type fuseholders are an answer to reduced space availability due to ever increasing product miniaturisation. The advantage over existing G-type fuses ...

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Filter blocks spurious signals
25 September 2002
Transceivers in the open 433 MHz bands tend to require filters with sharp cut-off characteristics, sometimes for spurious rejection only. Murata has added a new filter just for this function. The filter ...

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PCB-mounting current transformer
25 September 2002
Tae Hwa has introduced a full PCB-mounting current transformer (CT), designated the TC 151. This CT is rated for 20 A. With the primary output being a composite part of the unit, the need for a separate ...

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DIN rail surge protector for telephone/data line
25 September 2002
The DL module from Citel is designed to protect telephone and data lines. The surge protection function, based on a gas discharge tube/diode combination, is for one pair and is pluggable for fast and ...

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Servicemen's fuse assortment
25 September 2002, Actum
Available from ELU are its servicemen's fuse assortments especially produced for overall workshop and 'on-the-spot' after sales service. Available in F (Fast), M (Medium) and T (Slow) versions and five ...

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ESD protection for USB 2.0 systems
25 September 2002, MB Silicon Systems
Integrated circuits connected to Version 1.1 universal serial Bus (USB) ports are susceptible to damaging electrostatic discharge (ESD) pulses. With frequent overvoltage or over-current occurrences, the ...

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Earthing and lightning protection course - Durban
25 September 2002
A course on Earthing and Lightning Protection of Electronic Systems will be presented in Durban on Thursday 10 October 2002. The one-day course is presented by Innopro in association with the Division ...

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Eliminate audio cable noise
25 September 2002
New Murata technology creates three magnetically coupled common mode choke coils in one 2,5 and 2,0 mm chip. It is 1,2 mm high and contains no lead (Pb). The increase in digital equipment with audio ...

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A comparison between the Transil/Trisil protectors
25 September 2002
To protect a sensitive device there are two different approaches. The first is to use series protectors, the second, parallel suppressors. The technologies used in both cases are such that the series ...

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1 to 4-pair surge protection boxes
25 September 2002
Citel's BP1 unit is designed to protect terminals linked by one pair to telephone or data networks. The removable protection circuit makes maintenance fast and easy. The B280, B380, B480 units are designed ...

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Intelligent high-side power switches
25 September 2002, Electrocomp
The highly integrated miniPROFET (protected field-effect transistor) switch from Infineon Technologies incorporates a broad range of smart functions that makes it suitable for a wide variety of automotive ...

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EMI filter simulator now has new features
25 September 2002
Simulation of differential mode circuits has been added to Murata's EMI filter simulator. New features include rapid differential transmission circuits for USB, IEEE-1394 and LVDS interfaces, ceramic ...

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Protection for T1/E1/E3 systems with low-voltage triple TISP
25 September 2002
Bourns has introduced the TISP70xxD series of thyristor integrated surge protectors. With high-speed data access systems gaining more importance in the modern world of telecommunications, Bourns has developed ...

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Fuses for telecom circuits
25 September 2002
Bourns has introduced a telecom fuse that enhances its substantial circuit protection offering. The model B1250T Telefuse is a powercross protection fuse designed for use in telecommunications circuit ...

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Filtered D-Sub with power/signal contacts
25 September 2002
Amphenol offers its Filter Combo D-Sub, 5W5 arrangement with fixed machine contacts and a zinc die cast cover. With Amphenol's stress isolated and solderless design, the company says it is able to manufacture ...

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ISDN surge protector
25 September 2002
The MJ8 2RN module is designed to protect ISDN subscriber terminals (TO/SO level, basic access). The MJ8 2RN from Citel uses standard ISDN connections (RJ45 modular jack), allowing instant installation. The ...

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