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Type B Vital Relays - Alstom

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Theory of Operation<br />

2. SECTION 2 – THEORY OF OPERATION<br />

2.1. GENERAL<br />

This section covers the functions of <strong>Alstom</strong> <strong>Type</strong> B relays.<br />

B relays contain various arrangements of contacts and coils. Information is presented<br />

as follows:<br />

• Relay Contacts and Coils<br />

• B1 <strong>Relays</strong><br />

• B2 <strong>Relays</strong><br />

Figure 2–1 identifies typical B1 relay components. Some type B2 relays look very<br />

similar to the typical B1 relay shown, others do not. See the B2 relay discussions for<br />

relay descriptions.<br />

P1457, Rev. Nov/07 2–1 <strong>Alstom</strong> Signaling Inc.

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