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ALPHA FIX Terminal Blocks
Screw Terminals
General data on 8WA
11/4
Siemens ET A1 · 10/2008
11
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Overview
Terminal strips with different terminal blocks: 8WA1 011-1DG11 terminal
blocks, 8WA1 011-1NG31 neutral isolating terminals with feeder terminal
for neutral busbar 6 × 6 mm, 8WA1 011-1PG00 PE terminals, 8WA1 011-
1SF12 fuse terminals, and various two-tier terminals. The EN 50022-35-
compliant standard mounting rail serves as the PE bar.
Terminal blocks are used for the space-saving connection of in-
coming and outgoing lines in switchgear and distribution
boards.
Standards
EN 60664-1,
EN 60999 and
IEC 60 947-7-1 or
IEC 60 947-7-2.
The terminals are finger-safe according to IEC 60529
and EN 50274 (except for bare terminals and soldering connec-
tions). Through-type terminals are resistant to earthquakes ac-
cording to IEC 60068-2-6.
Rated short-time withstand current
Our screw terminals are able to withstand a rated short-time cur-
rent corresponding to a current density of 120 A/mm
2
specific to
the nominal cross-section for a duration of one second.
Colored terminal blocks
With colored wiring according to EN 60204-1, the connecting
level can also be included in the colored markings:
• Red for control circuits with AC current
• Blue for control circuits with DC current or neutral conductor
• Orange for interlock circuits with AC or DC current which are
fed from outside and are live when the main switch is turned
off
• Green-yellow through-type terminals for protective conductors
(without a link to the support rail).
Design
The terminal blocks are insulated on both sides, with the excep-
tion of two-tier, flat-type and bolt-type screw terminals, which are
insulated on one side only.
The insulating material for terminal sizes up to 240 mm² is made
of thermoplastic, polyamide 6.6.
The materials used are environment-friendly: For example, they
are cadmium-free and contain no halogens or silicone.
The plastics used are flame-retardant and self-extinguishing ac-
cording to EN 60695-2-2, VDE 0471 Part 2-2 and UL 94 V-2.
Clamping methods
The terminals are designed so that when the terminal screws are
tightened, any tensile stress which occurs causes elastic defor-
mation of the terminal bodies. This compensates for any creep-
age of the clamping conductor. The deformation of the threaded
section prevents loosening of the clamping screw, even under
heavy mechanical and thermal strain (for example vibration
stress of 10 g or thermal cycles).
The following clamping methods are used: Terminal body with
pressure plate for terminal sizes 16, 35 and 70 mm². Strain-relief
clamps for terminal sizes 2.5, 4 and 6 mm². Screw with connec-
tion disk for fuse terminals and component terminals.
Terminal size
The terminal size corresponds to the nominal cross-section. Ac-
cording to EN 60947-7-1, a finely stranded copper conductor of
nominal cross-section can be connected to any clamping point
with or without end sleeve.
Mounting
The terminals are snapped onto 35 mm support rails according
to IEC 60715 TH35 and secured against movement using end
retainers.
A lateral mounting tolerance of 0.2 mm must be maintained be-
tween the terminals.
Connection of conductors
Except for flat and bolt-type versions, all terminals are designed
so that solid, stranded and finely stranded conductors with or
without end sleeves (according to DIN 46228) can be securely
clamped (please observe cross-section).
Damage to the clamped conductors is prevented by pressure
plates or strain-relief clamps. For the conductor cross-sections
when 1 or 2 conductors are connected, see technical specifica-
tions.
© Siemens AG 2008
