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ConfigurationandAssemblyofUL489Busbars

UL489 Busbars are available in 3 different Pin Configurations per Phase, (6, 12 and 18 Pins).

The UL489 busbar cannot be cut, since the creepage and clearance distance requirements from UL are too

stringent. Therefore, to obtain the desired No. of Pins, Busbar-Pins can be overlapped as explained below:

1) Busbars are overlapped backwards to each other. Both Pins of each Busbar fit together

in the terminals of the Minature Circuit Breaker.

2

The Number of overlapping Pins of 2 Busbar must be a multiplier of the Number of

Phases to keep existing Phase sequence. (Can be overlapped by more than the number

of phases).

3) Any available combination of the 3 different Pin configurations is possible.

4) In most cases there is more than 1 combination possible.

5) For more possible configurations see Busbar Selection Table on page 21.

ConfigurationExamples*

AltechBusbarSystems

3P16UL

3/18

3P16UL

3/18

3P16UL

3/12

3P16UL

3/18

3P16UL

3/12

27 Pins: 1 x 3P16UL3/12 + 1 x 3P16UL3/18

39 Pins: 1 x 3P16UL3/12 + 2 x 3P16UL3/18

2P16UL

3/18

2P16UL

3/12

2P16UL

3/12

2P16UL

3/12

2P16UL

3/12

22 Pins: 2 x 2P16UL3/12

36 Pins: 2 x 2P16UL3/12 + 1 x 2P16UL3/18

1P16UL

3/18

1P16UL

3/12

1P16UL

3/6

1P16UL

3/6

1P16UL

3/6

16 Pins: 3 x 1P16UL3/6

29 Pins: 1 x 1P16UL3/12 + 1 x 1P16UL3/18

1 Phase

2 Phase

3 Phase

MCBs_2013_UsethisOne.QXD_CircuitBreakers_2006(togo3).QXD 11/14/13 10:51 AM Page 64