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BD2 <strong>System</strong> — <strong>160</strong> ... 1250 A<br />
© Siemens AG 2007<br />
Introduction<br />
■ Design<br />
Trunking units<br />
Power is transferred through nickel-plated and tinned aluminum<br />
busbars as well as tinned copper busbars.<br />
The low inherent impedance and large surface area of the<br />
busbars limit the heat build-up.<br />
The result is a low transmission loss and a low voltage drop.<br />
Enclosure<br />
The enclosure is made of hot galvanized steel with a paint finish.<br />
Color: RAL 7035 (light gray).<br />
Protected to IP52 degree of protection as standard. This can be<br />
increased to IP54 or IP55 with additional parts.<br />
½N L1 L2 L3 ½PE<br />
Left: Tap-off point for BD2.-<strong>160</strong> to BD2.-<strong>40</strong>0<br />
Right: Tap-off point for BD2.-500 to BD2.-1250<br />
Connections<br />
Trunking units are connected quickly and securely via the clamp<br />
terminal.<br />
NSV0_00088<br />
½N L1 L2 L3 ½PE<br />
68<br />
NSV0_00082<br />
167 167<br />
<strong>160</strong> ... <strong>40</strong>0 A 500 ... 1250 A<br />
126<br />
BD2A-1 trunking units<br />
NSV0_00090<br />
N L1 L2 L3 ½PE<br />
Left: Flange cover<br />
Right: Clamp terminal<br />
Clamp terminal<br />
N L1 L2 L3 ½PE<br />
68<br />
167<br />
<strong>160</strong> ... <strong>40</strong>0 A<br />
BD2A-2, BD2C-2 trunking units<br />
NSV0_00084<br />
167<br />
500 ... 1250 A<br />
N L1 L2 L3 PE<br />
126<br />
Features:<br />
• Even holding pressure ensures completely secure connection<br />
of all five busbars. Quick mounting up to <strong>40</strong>0 A with plug-in<br />
terminal, from 500 A to 1250 A with bolt terminal.<br />
• The built-in expansion compensation absorbs the heat<br />
expansion of the busbars.<br />
• The terminal can be tightened using conventional tools.<br />
• Two sizes are available for the whole system.<br />
• The clamp terminal is supplied as an integral part of the<br />
trunking units and junction units.<br />
N L1 L2 L3 PE<br />
167<br />
<strong>160</strong> ... <strong>40</strong>0 A<br />
68<br />
NSV0_00086<br />
167<br />
500 ... 1250 A<br />
126<br />
5<br />
BD2A-3, BD2C-3 trunking units,<br />
junction units, BD2A-..., BD2C-... feeder units<br />
Tap-off points<br />
The busbar support and tap-off point form a unit.<br />
The leading/delayed PE contact at the tap-off unit provides<br />
positive opening or closing of the tap-off point.<br />
The tap-off point can be coded at the factory on request,<br />
together with the tap-off unit. The tap-off point is sealable.<br />
BD2-AK1, BD2-AK02(03), BD2-AK2(3) and BD2-AK04 tap-off<br />
units are plug-in types for all systems, BD2-AK05(06) tap-off<br />
units are only for systems from 500 A.<br />
NSV0_00092<br />
Left: BD2-<strong>40</strong>0-SK for <strong>160</strong> to <strong>40</strong>0 A<br />
Right: BD2-1250-EK for 500 to 1250 A<br />
Four screws provide the mechanical connection to the<br />
enclosure.<br />
NSV0_00094<br />
5/4 Siemens LV 70 · 2006
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