Type B Vital Relays - Alstom

General Description
The registration feature takes care of six important differences in relays:
• Differences in timing
• Differences in contact arrangement
• Differences in contact opening
• Differences between track and line relays
• Differences in coil resistance
• Differences in coil arrangement
1.2.6. Insulators
Insulators are made of molded plastic and fit into slots in the plugboard. Each insulator
is held in place by a locking latch molded into a spring beam on one side of the insulator
as shown in Figure 1–8. An extractor tool must be used to remove the terminals prior to
removing the insulators. To release the insulator so that it can be pulled out of the
plugboard, squeeze the spring beam and push the insulator towards the front of the
plugboard.
There are 11 insulators in a B1 plugboard and up to 20 in a B2 plugboard.
PLUGBOARD
SPRING BEAM
SQUEEZE TOWARDS
INSULATOR TO RELEASE
INSULATOR
INSULATORS
EXTRACTOR
CRIMP WIRES TO
TERMINAL CONNECTIONS
Figure 1–8. Latching Insulator
NOTE
An integral beam latch secures the insulator to the plugboard.
P1457, Rev. Nov/07 1–9 Alstom Signaling Inc.