The bistable relay RBS-1 are meant for multiplying and memorising signals (in case of voltage loss) in the electro-energetic automation circuits. The relay has two controlling inputs: turning ON (ZAŁ) and OFF (WYŁ) with diodes indicating application of steering voltage, two input relays and the bistable element with three switch-over contacts. The RBS versions of the relay are additionally equipped with optical indicator of operation.