18
Style Y (Class B) Bell Circuit
This is a 2-wire Style Y (Class B) power-limited and
supervised signalling (notification appliance) circuit.
Devices and the 10 k end-of-line resister are connected
as illustrated in Figure 21. Maximum wire lengths are
shown in Table 4. Use only approved devices.
Note: The inrush current of some devices may cause the current to exceed the 1.5A current limit
momentarily.
Figure 19: MRI-M500R Wiring for Form C Relay Use
NC 8
NO 7
COMMON 9
5 NC
4 NO
6 COMMON
Figure 20: MRI-M500X Wiring
EOL-103
EOL
10 k
Regulated 24 FWR
Figure 21: Style Y (Class B) Bell Circuit
Wiring
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