SQUARE D MICROLOGIC SERIES B TRIP CURVE


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Sometimes, such a coordination study is not available at installation. Main page How to browse and search Random page. Other values of voltage are also assigned to the circuit-breaker, corresponding to disturbed conditions as noted in Other characteristics of a circuit-breaker. This page has been accessed , times. This is the maximum value of current that a circuit-breaker, fitted with a specified overcurrent tripping relay, can carry indefinitely at an ambient temperature stated by the manufacturer, without exceeding the specified temperature limits of the current carrying parts. Overload thermal or long-delay relay trip-current setting Im:

A circuit breaker which can be fitted with overcurrent tripping units of different current level-setting ranges, is assigned a rating which corresponds to the highest current-level-setting tripping unit that can be fitted. The value of current quoted in the standards is the rms value of the AC component of the fault current, i. Short-circuit tripping relays instantaneous or slightly time-delayed are intended to trip the circuit-breaker rapidly on the occurrence of high values of fault current. Read the Text Version. The trip-current setting Ir or Irth both designations are in common use is the current above which the circuit-breaker will trip. Modular industrial circuit-breakers [b]. For the latter circuit-breakers there exists a wide variety of tripping devices which allow a user to adapt the protective performance of the circuit-breaker to the particular requirements of a load see Fig.

Due to design differences in how the tripping values are found, a comparison of trip curves is necessary to find which ground-fault pickup and delay settings on the electronic trip circuit breaker will approximate the values of the GROUND-CENSOR ground-fault relay. Overload thermal or long-delay relay trip-current setting Im: For more information on coordination and trip curves, or for a complete power system analysis microloglc coordination study, contact your local Square D sales office.

Energy Efficiency in electrical distribution. No responsibility is assumedPO Box by Schneider Electric for any consequences arising out of the use of this material.

In general, the greater e level of fault current at a given voltagethe lower the power factor of the fault-current loop, for example, close to generators or large transformers. Icu rated ultimate s. MV and LV architecture selection guide for buildings.

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You can publish your book online for free in a few minutes! Create your own flipbook. Short-circuit instantaneous relay trip-current setting.

Other values of voltage are also assigned to the circuit-breaker, corresponding to disturbed conditions as noted in Other characteristics mifrologic a circuit-breaker. Standard values for this relationship have been established in some standards. Short-circuit magnetic or short-delay relay trip-current setting Ii: Connection to the LV utility distribution network.

A circuit-breaker is suitable for isolating a circuit if it fulfills all the conditions prescribed for a disconnector at its rated voltage in the relevant standard. Characteristics of particular sources and loads. Main page How to browse curce search Random page. Modular industrial circuit-breakers [b]. Moreover, in order to adapt a circuit-breaker to the requirements of the circuit it controls, and to avoid the need to install over-sized cables, the trip relays are generally adjustable.

Time-Current Curves

Contents 1 – Rated operational voltage Ue 2 – Rated current In 2. Views Page Talk View source History. This document is intended to recommend switch positions for Square D electronic trip circuit breakers when no other information is readily available. View in Fullscreen Tirp.

This is the voltage at which the circuit-breaker has been designed to operate, in normal undisturbed conditions. How to contribute Play with sandbox Recent changes Help. General rules of electrical installation design Connection to the MV utility distribution network Connection to the LV utility distribution network MV and LV architecture selection guide for buildings LV Distribution Protection against electric shocks and electrical fires Sizing and protection of conductors LV switchgear: It also represents the maximum current that the circuit-breaker can carry without tripping.

The value of current quoted in the standards is the rms value of the AC component of the fault current, i. That value must be greater than the maximum load current Trjp, but less than the maximum current permitted in the circuit Iz see chapter Sizing and protection of conductors.

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MICROLOGIC® Trip Unit Settings – Schneider Electric Pages 1 – 4 – Text Version | FlipHTML5

This page was last modified on 6 Aprilat Derating a circuit-breaker is achieved therefore, by reducing the trip-current setting of its overload relay, and marking the CB accordingly. In for circuit-breakers in IEC is equal to Iu for switchgear generally, Iu being the rated uninterrupted current. Retrieved from ” http: Sizing and protection of conductors.

A circuit breaker which can be fitted with overcurrent tripping units of different current level-setting ranges, is assigned a rating which corresponds to the highest current-level-setting tripping unit that can be fitted.

This is the maximum value of current that a circuit-breaker, fitted with a specified overcurrent tripping relay, can carry indefinitely at an ambient temperature stated by the manufacturer, without exceeding the specified temperature limits of the current carrying parts. The size of the circuit-breaker is A. Read the Text Version. The trip-current setting Ir or Irth both designations are in common use is the current above which the circuit-breaker will trip.

Chapter – LV switchgear: Sometimes, such a coordination study is not available at installation. Tripping curve of a circuit breaker with advanced electronic trip unit. These can be identified by the presence of two rows of rotary switches on the trip unit for setting pickup and delay values.

MICROLOGIC® Trip Unit Settings – Schneider Electric

Tripping-current ranges of overload and short-circuit protective devices for LV circuit breakers. In such a case it is referred to as a circuit-breaker-disconnector and marked on its front face with the symbol.

Tests for proving the rated s. Data Bulletin Bulletin No. Protection against electric shocks and electrical fires. The above values are given only as being those in common use.

Industrial circuit-breakers [b] IEC