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Type B Vital Relays - Alstom

Type B Vital Relays - Alstom

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General Description<br />

1.2.4. Mounting<br />

The B relays plug on to plugboards. The contacts and the coil terminals of the relay<br />

protrude through the base of the relay as prongs. The plugboard has wedge-shaped<br />

plug insulators with flat metal terminals on the two faces of the wedge. Two rods guide a<br />

relay being plugged in, allowing the pairs of relay prongs to meet with corresponding<br />

wedges, spreading the prongs apart. The prongs slide onto the respective plugboard<br />

terminals making contact as shown in Figure 1–6.<br />

CONTACT BLOCK<br />

IN RELAY<br />

PLUGBOARD<br />

CONTACT PRONGS<br />

TERMINAL<br />

Figure 1–6. <strong>Type</strong> B Plug Connections<br />

P1457, Rev. Nov/07 1–7 <strong>Alstom</strong> Signaling Inc.

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