The BIS-409 relay has two switching sections and enables two circuits (branches) of lighting or other receivers to be connected according to the selected sequence from several different points.
Functioning
Power supply of the relay is signaled by the green LED. The sequential relay has two separate outputs R1 and R2. The contact status (closed / open) is forced sequentially according to the given program. Switching the contacts into the next state follows the next pulse of the control button. The switching of the R1 and R2 contacts is signaled by the lighting of the corresponding red LEDs R1 and R2. After a power failure, the contact status is reset. After restarting the supply voltage, the relay starts operation from sequence No. 0.
Note!
BIS-409 compatible with bell pushes equipped with fluorescend lamps. (ΣI<5mA). 
Tabela mocy
The above data are indicative and will heavily depend on the design of a specific receiver (that is especially important for LED bulbs, energy-saving lamps, electronic transformers and pulse power supply units), switching frequency and operating conditions.
Tips
Illuminated buttons
If too many illuminated buttons are connected, the lighting may switch on spontaneously or switch on permanently. Maximum load current The contact current given in the technical data is the maximum value and may be subject to restrictions – more information. If the information provided indicates that the relay in the device is insufficient, it is recommended to use an external switching element (e.g. contactor) adapted to switch large surge currents.State memoryThe relay does not have a “memory” of the contact position. This means that after the power supply is switched on, the relay contact will always remain in the off state.
