Thermal Magnetic Characteristics and Adjustments
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1 Thermal Magnetic Characteristics and Adjustments - Range Operation Settings Examples Time, Current and Temperature Curves 7- Special Applications N S
2 Range Characteristics TemBreak thermal magnetic MCCBs are available from 0AF to 00AF. Depending on the type of MCCB chosen the thermal and/or magnetic trip setting may be adjustable. MCCB type Fixed Adjustable Fixed Adjustable Thermal Thermal Magnetic Magnetic XS0NB, XE00NS XSCS, XSNS XSCJ, XSNJ, XHNJ XS0NJ, XH0NJ XENS XS0NJ, XS0PJ, XH0NJ XE00NS XS00CJ, XS00NJ XE00NS XS0CJ, XS0NJ XH00PS XS00NJ : Yes : No Access to Setting Dials From AF to 0AF the thermal adjustment is visible from the front of the MCCB. At 00AF and above a protective cover must be removed to gain access to the settings. To achieve access to the settings the cover screw under the 'sealed' label must be removed. To adjust the individual trip settings turn the setting dial with a flat bladed screwdriver. Once set secure the cover and apply a new sealing label. Access to setting dials can be restricted using optional lead sealing facility. XS0NJ XS00NJ Sealed label XS00NJ (cover removed) Thermal adjustment setting dial Thermal adjustment setting dial. Spare sealing labels Magnetic adjustment setting dial Thermal adjustment dial blanking kits are available for and 0A frame MCCBs
3 Operation Settings Thermal Adjustment TemBreak MCCBs have a wide thermal adjustment range, one of the largest on the market. The rated current 'Ir' is continuously adjustable from % to 00% of its nominal current 'In'. There are three main points of calibration marked at %, 0% and 00%, as shown in the diagram below. Magnetic Adjustment Magnetic adjustment is available on MCCBs of 00AF and above. The magnetic setting 'Im' is continuously adjustable from 00% to 000% of its rated current 'In'. There are five main points of calibration marked as multiples of In ;,, 7.,. & 0. These are shown in the diagram below Thermal adjustment range Time Time x x x7. x. x0 Ir 0. Im 7.. Magnetic adjustment range 0. 0 xin xin Current x In Current x In Examples. XSNJ/A MCCB set at Ir = 0., the rated current is calculated as x 0. = 00A. XS00NJ/00A MCCB set at Im =, the magnetic setting is calculated as 00 x = 00A. XS0NJ/0A MCCB set at Ir = 0. & Im =.0 The rated current is calculated as 0 x 0. = 0A The magnetic setting is calculated as 0 x = 0A Note that the magnetic setting is a multiple of the nominal current In and not the rated current Ir. All thermal and magnetic trip settings are expressed as AC r.m.s. values. All MCCBs are calibrated at C unless otherwise specified. Breakers with adjustable magnetic trip Breaker Rated current Scale XE00NS XS00CJ XS00NJ XE00NS XS0CJ XS0NJ XS00NJ XH00PS Note: The figures mentioned are standard values, if values other than those shown are required, please contact Terasaki. Note: Setting; -poles can be adjusted simultaneously with one adjustment dial.
4 Examples Example The XS0NJ set at its maximum thermal setting of 0A experiences an overload of 0A. What would be the tripping time? Solution As the axis are 'percent' rated current the overload as a percentage to rated current is 0 0 = 00% The maximum and minimum on the curve are the tolerance bands. Therefore at 00% overload the tripping time would be as follows: trip time 0 seconds trip time 0 seconds Average trip time 0 seconds Due to strict quality control of the manufacturing and calibration processes, the characteristic curve of most MCCBs will follow the 'average' curve within the tolerance band Example A (min.) 0A (max.) The XS0NJ is calibrated at 0A for 0 C ambient. If the rose to C what effect would this have? (Assume that MCCB thermal setting is at maximum) Solution At C the ambient compensating factor is 97%, i.e. 0 x 0.97 = A. In other words the XS0NJ would act as an MCCB set at A, in C. at 0 C C 0 C
5 XM0PB XM0PB Rated curr. Mag. trip curr ±.. 9.±..0±.0..±0..0± ±0.0.0± ±0.0.0± Percent current rating at 0 C C 0 C
6 XS0NB, XE00NS XS0NB XE00NS (, 0, 0, 0, 0A) (0A) (, 0, 0, 0, 0A) (0A) Rated curr. Mag. trip curr. 0 0±0 ±7 0 00±00 0 0±0 0 00± ± (0A) (0, 7, 00A) (, 0, 0, 0, 0A) (0, 7, 00A) (0A) (, 0, 0, 0, 0A) Rated curr. Mag. trip curr. 0 0±0 ±7 0 00±00 0 0±0 0 00± ±0 0 70±0 7 97± 00 00± A A 0A 0A 0A 0A -00A A 0A 0A 0A 7A 0A 0A 00A 0A at 0 C C 0 C Percent tripping time at 0 C C 0 C A at 0 C C 0 C Percent tripping time at 0 C C 0 C
7 XSCS, XSNS, XSCJ, XSNJ, XHNJ XSCS, XSNS XSCJ, XSNJ, XHNJ Rated curr. Mag. trip curr. 0± 0 0± ± 0± 0 0±0 0 0±0 0± 0 00± ±0 0±0 0~00A Rated curr Mag. trip curr. NRC 0 0± 0± 0 0±0 0± 00 00±0 0±0 0,, 0,, 00A A A A, 0A(min.) 0, 0,, 0A 0, 00A 0 A(min.) 00, A(min.) ,, 0A A , 0A(max.) A(max.) A(min.) 00, A(max.) A(max.) at 0 C C 0 C at 0 C C 0 C
8 XENS, XS0NJ, XH0NJ, XS0NJ, XS0PJ, XH0NJ XENS XS0NJ, XH0NJ, XS0NJ, XS0PJ, XH0NJ Rated curr. Mag. trip curr. 0±0 0 70±0 7 70±0 00 0±0 0± Rated curr. Mag. trip curr. NRC 0 70±7 0 70± A 0 0A (min.) A 0A, 00A, A A (min.) 0A (max.) 0A (max.) at 0 C C 0 C at 0 C C 0 C
9 XE00NS, XS00CJ, XS00NJ XE00NS XS00CJ, XS00NJ X X0 Rated curr. Mag. trip curr. 0 00± ± ± ±00 Adjustable setting range of magnetic trip. Five stages X X0 Rated curr. Magnetic trip curr. NRC 0 00± ±00 Adjustable setting range of magnetic trip. Five stages A 00-0A A max. 00A max. 0A min. 00A min. at 0 C C 0 C at 0 C C 0 C
10 XE00NS, XS0CJ, XS0NJ XE00NS XS0CJ, XS0NJ X X0 Rated curr. Magnetic trip curr ± ±00 Adjustable setting range of magnetic trip. Five stages X X0 Rated curr. Magnetic trip curr. NRC ± ±0 Adjustable setting range of magnetic trip. Five stages A 00A 00A A (min) 00A (min) 0A (max) 00A (max) at 0 C C 0 C at 0 C C 0 C
11 XS00NJ, XH00PS XS00NJ XH00PS Rated curr. Magnetic trip curr. NRC ±00 Adjustable setting range of magnetic trip. Five stages Rated curr. Magnetic trip curr. NRC ± ±00 Adjustable setting range of magnetic trip. Five stages X X X X A(min) 00A (max) A A at 0 C C 0 C at 0 C C 0 C
12 XS000ND, XS0ND, XS00ND, XS000ND, XS00ND XS000ND XS0ND,XS00ND,XS000ND, XS00ND Setting tolerance (Scale) Scale Scale Setting tolerance (Scale) 00 Rated curr. Magnetic trip curr. NRC ±00 Adjustable setting range of magnetic trip. Five stages Setting tolerance (Scale) Rated Current Setting tolerance (Scale) Adjustable setting range of magnetic trip. Five stages (adjustable) 0 Rated current Scale A(min) NOTE: Setting tolerance + 0% at 000A and + % for other settings. at 0 C C 0 C
13 Special Applications Generator protection The steady state current produced by a generator under a fault condition can be as low as to times the rated full load current. In this situation it is advisable to use a 'generator protection' MCCB. This has its magnetic setting calibrated low enough to trip quickly on low generator faults, as shown in the table on the right. The thermal part of the characteristic curve is the same for the corresponding MCCB. ~ Generator protection INST. settings Breaker Rating Trip current X In XSNJ (SRX) XSNJ-G XS0NJ-G XS0NJ-G 0. XS00NJ-G 0 LO=. 0 HI=0 00 LO= HI=000 XS0NJ-G 00 LO= HI=000 0 LO=00. 0 HI=0 XS00NJ-G 00 LO= HI=000 D.C. Application All standard TemBreak thermal magnetic MCCBs are suitable for DC application up to 0V DC. Refer to Section, Ratings and Specifications for details of DC breaking capacity up to 0V. Above 0V DC, special versions of the standard MCCBs are required, as shown in the table opposite. Refer to the connection diagram below. SOURCE + Type breaking capacity (ka) poles in series 0V DC 00V DC 00V DC XSNJ-D 0 7. XHNJ-D 0 7. XS0NJ-D 0 7. XH0NJ-D 0 0 XS00NJ-D 0 XS0NJ-D XS00NJ-D XS000ND () XS0ND () () XS00ND () () XS000ND () () XS00ND () () () The breaker is magnetic trip only without overload protection. () UVT can not be fitted. Note that the DC ratings shown apply when the time constant of the circuit is: less than.0 ms at approximately rated current (In) less than. ms for overloads of between In and.xin less than 7 ms for short circuits of 0 ka or less less than ms for short circuits greater than 0 ka LOAD Three () poles in series Magnetic only MCCBs All Terasaki's thermal-magnetic TemBreak MCCBs are available as magnetic-trip only versions. These have the same fit and form as the standard versions, but do not have thermal tripping elements. They are ttherefore suitable to be used as Short Circuit Protective Devices in motor starters.
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