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TECHNI CAL DATA
MCCB
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7T3 FRAME MCCB s TECHNICAL SPECIFICATION
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7T3 FRAME SPECIFICATION
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• Specification IEC 60947-2 & IEC 60947-3
• Current Range 100 – 630Amps
• Ue Rated Operation Voltage 690V AC
• Ui Rated Insulation Voltage 690V AC
• Rated Frequency 50/60Hz
• Release Electronic
• Adjustment 0.4 – 1.0 x Trip Unit
Rated Current
• Instantaneous Adjustment Adjustable – see below
• Icu (415V) Short Circuit Breaking Capacity 7T3S 36kA 7T3H 65kA
• Working Environment Both Dry and Tropical
Climates
• Mechanical Endurance 20,000 Cycles
7T3 FRAME FEATURES
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The 7T3 circuit breaker consists of switching unit and either a range of
different rated electronic trip units, or a disconnector module. The modular
design provides the maximum flexibility as the user can decide not only the
rating but also the function, disconnector or protective device. With a wide
setting bandwidth electronic trip units offer unparalleled functionality.
AVAILABLE OPTIONS
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• ST UVR
• Aux SW
• Rotary Handle (available on request)
• Padlocking
(See Product Section for selection)
SHORT CIRCUIT BREAKING CAPACITY
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Ue 7T3S Icu 7T3H Icu
230 V 60 kA 100 kA
415 V 36 kA 65 kA
Ics
= 50% Icu
TRIP UNIT SETTINGS
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Over current
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R = 0.4 - 1.0 x
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n
Instantaneous 4 or 12.5 x
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R
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n - Nominal Trip Unit Rating
MAIN CONNECTIONS
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The switching unit has a 32mm main contact which will accept up to M10
cable lugs, maximum width 30mm.
AUXILIARY EQUIPMENT OPTIONS
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a) UVR
b) Shunt Trip
c) Auxiliary Switches
Shunt Trip Voltage Range
≥
70%
Under Voltage Release Threshold
≤
35%
Input Power of Auxiliary Releases < 3VA AC, < 3W DC
CURRENT CHARACTERISTICS
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Maximum earth fault loop impendance (Zs) for circuit breakers with Uo of
230V, incorporating the 0.95 C
min
factor, 17th Edition IET Wiring Regulations
(BS 7671:2008), Amendment 3 effective from January 1st 2015
IR & II SET AT MINIMUM
CURRENT VALUE (A)
OHMIC VALUE
0.4
5
0.4
5
AMPS SECONDS SECONDS VOLTAGE SECONDS SECONDS
250
375A 375A
230V 0.583
Ω
0.583
Ω
400
600A 600A
230V 0.364
Ω
0.364
Ω
630
945A 945A
230V 0.231
Ω
0.231
Ω
IR SET AT MINIMUM & II SET AT MAXIMUM
250
1250A 575A
230V 0.175
Ω
0.380
Ω
400
2000A 920A
230V 0.109
Ω
0.238
Ω
630
3150A 1449A 230V 0.069
Ω
0.151
Ω
IR & II SET AT MAXIMUM
250
3125A 1500A 230V 0.070
Ω
0.146
Ω
400
5000A 2400A 230V 0.044
Ω
0.091
Ω
630
7875A 3780A 230V 0.028
Ω
0.058
Ω
IR SET AT MAXIMUM & II SET AT MINIMUM
250
1000A 1000A 230V 0.219
Ω
0.219
Ω
400
1600A 1600A 230V 0.137
Ω
0.137
Ω
630
2520A 2520A 230V 0.087
Ω
0.087
Ω
IEC 60947-2 copper conductors for test currents
350 – 400A 1 x 240mm
2
600 – 630A 2 x 185mm
2
400 – 500A 2 x 150mm
2
630 – 800A 2 x 240mm
2