Type B Vital Relays - Alstom

General Description
1.2.2. Identification
All Type B relays carry nameplates that contain the drawing number (part number) and
catalog number of the relay. Relay drawing number is also shown on the registration
plates of the relay. When inquiring about a particular relay, always provide the catalog
or drawing number.
The drawing and catalog numbers can be used with the tables in Appendix A to look up
the relay's Engineering Data (ED) Sheet number. The ED sheet contains technical
specifications referenced during some maintenance procedures.
Each B2 Relay has a Test Data Form on the cover and a name plate located inside the
relay, visible from the front of the cover.
Each B1 relay cover contains two recesses to allow attachment of two metalized
polyester film or mylar tags with permanent adhesive:
• a tag for relay operating and testing data
• a tag for circuit nomenclature
B1 Relays manufactured prior to 1991 have a different cover than those relays
manufactured after 1991. The most obvious difference is the handle on the front of the
relay. B1 relay nameplate, nametag and test data form locations for relays
manufactured pre and post 1991 are shown in Figure 1–2.
2 PIECE METAL
HANDLE
PLASTIC HANDLE
MOLDED TO COVER
NAMEPLATE
NAMETAG
TEST DATA
FORM
PRE 1991 STYLE
POST 1991 STYLE
Figure 1–2. B1 Relay Nameplate, Nametag and Test Data Form
P1457, Rev. Nov/07 1–3 Alstom Signaling Inc.