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ALPHA FIX Terminal Blocks
Terminals with Spring-Loaded Connection
General data on 8WA
12/65
Siemens ET A1 · 10/2008
12
■
Overview
Terminal blocks are used for the space-saving connection of in-
coming and outgoing lines in switchgear and distribution
boards.
Benefits
• Fast mounting
- Simply snap on
- Enclosed at both ends, no end plates required
• Simple connection
- Front connection, no end sleeves required
- 15° angle between screwdriver and conductor
- Same screwdriver for terminal sizes 1.5, 2.5, 4 and 6 mm²
- Screwless connection of neutral isolating terminal to N bar
• Small number of linking accessories
- Screwless cross connection system consisting of only 3 ac-
cessories: Two-pin jumpers, link rails with one-pin plugs for
terminal sizes 2.5, 4 and 6 mm².
• Uniform labeling plates on cards for the entire terminal range
up to 16 mm².
Standards
EN 60664-1, EN 60999 and IEC 60947-7-1 or IEC 60947-7-2.
For 8WA2, the size of the connecting holes corresponds to the
rated cross-sections of the conductors.
The terminals are finger-safe to IEC 60529 and EN 50274 (ex-
cept for those without covers or unconnected cable entries
10 mm² and 16 mm²). Through-type terminals are resistant to
earthquakes according to IEC 60068-2-6.
Rated short-time withstand current
Our terminals with spring-loaded connection are able to with-
stand a rated short-time current corresponding to a current den-
sity of 120 A/mm² specific to the nominal cross-section for a du-
ration 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).
Testing
Testing is possible without interrupting operation by inserting the
test plug into the provided opening, whereby the following test
plug arrangement must be observed:
Design
The terminal blocks are insulated on both sides. End plates are
therefore not required. The symmetrical design of the standard
terminals prevents them from being snapped on the wrong way
round. The insulating bodies up to and including terminal size
16 mm² are made of thermoplastic, polyamide 6.6 with a track-
ing resistance of CTI 600 according to DIN VDE 0303 Part 1.
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
according to EN 60695-2-2, VDE 0471, Part 2-2 and UL 94 V-2.
8WA2 through-type terminal without screws, sectional view
Terminal size
The terminal size corresponds to the rated cross-section. Ac-
cording to IEC 60 947-7-1, one finely stranded copper conductor
without end sleeve can be connected to each clamping point. If
the rated cross-section is connected with an end sleeve, the next
larger terminal size has to be used. End sleeves should only be
used in particularly corrosive ambient atmospheric conditions.
Clamping methods
The clamping point is opened by inserting a screwdriver, the
conductor is inserted to the stop and is clamped tight after the
screwdriver is removed. This ensures compliance with all na-
tional and international tensile requirements. The spring steel of
the spring-loaded terminal is of nickel-chromium, ensuring that
the contacting between the conductor and the terminal is corro-
sion-proof and vibration-resistant.
Mounting
The terminals are snapped onto 35 mm support rails according
to IEC 60715 TH35 and secured against movement with end
retainers. A lateral mounting tolerance of 0.2 mm must be
observed.
Connection of conductors
Due to the spring-loaded terminal system, solid, stranded or
finely stranded conductors can be clamped safely and perma-
nently by front insertion and without the use of end sleeves. One
conductor per clamping point can be connected. The cable en-
tries are designed in such a way that the insulation of the rated
conductor cross-section, and that of the next smaller cross-sec-
tion cannot be caught in the opening (the length of insulation to
be stripped is printed on the terminal). As a splice protection
measure when using finely stranded and very finely stranded
conductors, the ends can be tin-coated or compacted by means
of ultrasound.
NSH00001b
to 360 V:
16 mm
2
to
800 V
to 50 V:
2,5 mm
2
/
4 mm
2
to 400 V:
6/10 mm
2
Test plug
8WA1 8...
1
5
Screwdriver guide
Cut-out for
labeling plate
Cable entry
Elastic retaining feet
Spring-loaded terminal
Linking ducts
I2_14023
1
1
2
2
3
3
4
4
5
5
6
6
6
© Siemens AG 2008
