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The B224RB is a 6" mounting base with a built-in form C relay contact. The B224RB lets you control a wide variety of normally open and normally closed applications. The relay can operate in two different modes (short and long delay). Because the relay is addressable, the relay device can be located at any point in the signaling line circuit. SK series detectors intended for use with Silent Knight IntelliKnight series fire alarm control panel (FACP) plug into the B224RB.