Busch smoke alarm relay, studio white, security technology, Busch smoke alarm ProfessionalLINE, Busch smoke alarm relay Suitable for connection to external systems such as KNX via corresponding binary inputs. Suitable for connection to external systems such as Busch-free@home via corresponding binary inputs or extension inputs of the wireless sensor/actuator combinations (eg 6211/1.1-WL). Relay contact: potential-free changeover contact 230 V~ max. 5A Line connection: up to 2 x 2 x 1.5 mm With built-in radio module.