Tait T855 - Page 338

G5.2 DC Line Keying M850-00
31/09/98 Copyright TEL
Figure 5.3 Isolated Loop Current Switch
Figure 5.4 Typical System
O
+
O
O
-
O
+
O
-
SW
SW
Isolated
Suppl
y
-
Unit 1 Unit 2
+
Lon
g
Line
Det
Optional brid
g
e
to protect a
g
ainst
polarit
y
reversals
(T223 onl
y
).