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The source of alternating current "B2-4" was produced presumably since 1986. "B2-4" is a mains voltage stabilizer and is designed to supply electrical measuring instruments with a regulated voltage of industrial frequency. Provides protection of the device and the consumer from overloads and short circuits, has an indication of emergency mode (overload current and voltage). Main characteristics: Output voltage: 220 V. Output power 1000 V * A. Instability when the mains voltage is ± 0.5%, when the load current is ± 1.5%. The range of operating temperatures is from "“3 ° C to 50 ° C. Power: 220 ± 22V, 50 ± 0.5 Hz; 220 ± 11V, 400 ± 10 Hz. Replaces with itself the previous B2-2 and B2-3 stabilizers. Dimensions 160x228x308 mm. Weight 13 kg.