Siemens ALPHA Dist Boards & Terminal Blocks - page 365

ALPHA FIX Terminal Blocks
Terminals with Spring-Loaded Connection
8WA general technical specifications
12/85 Siemens ET A1 · 10/2008
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■ Technical specifications
Continuous load at increased ambient temperatures
8WA2 terminal blocks can be loaded with their full uninterrupted
current at ambient temperatures of up to +55 °C. At higher am-
bient temperatures, a current reduction according to the follow-
ing formula is required:
The maximum terminal overtemperature of 45 K according to
IEC 60947-7-1 and EN 60947-7-1, Part 1, is not exceeded at am-
bient temperatures up to 100 °C.
Standard mounting rails as PEN rails
Only Cu busbars must be used.
They must have the same current carrying capacity as protec-
tive conductor busbars.
PEN busbars must carry only terminals, and no devices.
Standard mounting rail as protective conductor busbar
Protective conductors with a larger cross-section than the pro-
tective conductor busbar and with the same conductivity can be
connected to standard mounting rails that are also protective
conductor busbars and carry current only under fault conditions.
1) With 8WA1 010-1PQ00 terminal connection of up to 95 mm² finely stranded
or 120 mm² stranded.
Clamping points
1) 8WA2 803 operating device. 2) 8WA2 806 operating device.
Rated impulse withstand voltage of terminal blocks
Values depend on the mains rated voltage rated insulation volt-
age of terminal block; excerpt from EN 60947-1, table H.1.
Terminal blocks are tested to overvoltage category III.
Ith2’ = I th2 · k
Ith = Uninterrupted current according to selection tables, relative to the nominal cross-
section
Ith2’ = Uninterrupted current at increased ambient temperature
k = Derating factor according to table
Ambient tempera-
ture
Derating factor k
60 °C 0.94
65 °C 0.88
70 °C 0.82
75 °C 0.75
80 °C 0.67
85 °C 0.58
90 °C 0.47
95 °C 0.33
Standard mount-
ing rail
acc. to
IEC 60715 TH35
Material Type Max. permissible
cross-section
of connected pro-
tective conductor
mm²
35 × 7.5 Steel 5ST1 141 16
Steel, perforated 5ST1 145 16
Similar to 35 × 15 Steel 5ST1 142 35
Steel -- 50
Copper 8WA7 551 50
150 1)
Terminal size Type Thread diameter of
terminal screws
Screwdriver blades
according to DIN 5264
8WA2 803 or 8WA2 804 1)
Tightening torque
= test torque
Tensile forces
according to
IEC 60947-1
at max. con-
ductor connec-
tion
Stripped
length
mm2 Nm N mm
1.5 8WA2 011-3KE 1) -- 0.5 × 3.5 -- 40 8 ... 9
2.5 8WA2 011- 1) -- 0.5 × 3.5 -- 50 7 ... 9
4 8WA2 011- 1) -- 0.5 × 3.5 -- 60 8 ... 10
6 8WA2 011- 1) -- 0.5 × 3.5 -- 80 11 ... 13
10 8WA2 011- 2) -- 0.8 × 5.5 -- 90 --
16 8WA2 011-1NK23,
8WA2 011-3JG11
M4 0.8 × 4 1.2 100 13
Rated mains voltage
( Rated insulating
voltage of the device)
Highest rated operational voltage to
ground
Preferred values for rated impulse withstand voltage
as 1.2/50 s-pulse
Overvoltage category
RMS value
V AC
RMS value
V AC or DC
I
kV
II
kV
III
kV
IV
kV
-- 50 330 500 800 1500
66/115 100 500 800 1500 2500
120/208 127/220 150 800 1500 2500 4000
230/400 277/480 300 1500 2500 4000 6000
400/690 600 2500 4000 6000 8000
1000 1000 4000 6000 8000 12000
© Siemens AG 2008