relay bias currents

Why would a relay have bias currents such as this: http://www.teledynerelays.com/pdf/military/ca.pdf . Does it have something
to do with operating it in open-collector mode?
Thanks,
David.
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snipped-for-privacy@yoowhoo.com says...

Are you asking why it has a BIAS pin or why the current is what is is?
The relay is controlled by a CMOS level. The control input switches current in the BIAS pin to drive an LED (apparently) in the optical isolator. The BIAS input looks like a current sink so is a constant 12ish MA above 5V.
Or are you asking something else?
--
Keith

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