Type B Vital Relays - Alstom

P1457, Rev. Nov/07 2–11 Alstom Signaling Inc.
1
Circuit
B1 Relay B2 Relay
E = 2 RI
I
–
3A
R
R
3D
2
3B
3C
E = (1/2r)(2I)
2I
– r
3A
r
3B
3D 3C
3A
–
3B
4
–
–
3E
3E
3D 3C 3E + –
3D 3C 3E
3A
3D
3B
3C
3E
+
+
+ –
+
–
1C R
R
6D
– r
1C r
6D
–
Table 2–2. Coil Connections and Timing Characteristics
1D
6C
1D
6C
6E
6E
6D 6C 6E
+
6D 6C 6E
1C
6D
1D
6C
+
+
+
+
6E
Circuit
Description
Series
Multiple
One coil
separating slugs
on other core
One coil
separating slugs
on other core
Series with
rectifier shunted
across coils
Timing
Characteristics
Pickup normal
Release normal
Pickup fast
Release normal
Release slow: up
to as high as
three (3) seconds
Pickup slow: up
to as high as
three (3) seconds
Pickup normal
Release slow,
but less slow
than 3A or 3B
Notes
I = WORKING current
R = resistance of one coil
E = voltage required to get
full pressure on the front
contact
Voltage across coils is one
half (1/2) the voltage across
the coils of item 1 above
Timing is affected when
controlled over line because
of line drop
Timing is affected when
controlled over line because
of line drop
Do not use in circuits
subject to lightning
Do not energize from a
battery whose other circuits
are subject to lightning
Theory of Operation