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Joined: Sep 2006
Posts: 3,290
Member
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Member
Joined: Sep 2006
Posts: 3,290 |
Sam, it wasn't quite as clear-cut as that, but you're close.
1A was flat spring relays, 50A was 1A equipment in a packaged unit. The units were on horizontal plates that mounted in a cabinet. They were electrically equivalent to 1A.
1A1 originally used flat-spring relays, and then evolved to wire-spring relays.
1A2 pre-packaged KSU's such as the 501 would have had a carrier for six 4" KTU's, (400-series) but also had a space below for a 207 selector and a 216 transfer unit. WE and ITT both made that version.
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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