Undercurrent relay, single phase, IK9271Application: 1-phase undercurrent monitoring in three-phase and alternating current networks 4 measurement ranges from 0.1 → 15A without an additional current transducer (programmable via rotary control) Fixed hysteresis Adjustable switching delay Rest current principle LED displays: applied voltage, activated output relay Auxiliary voltage 230VAC Auxiliary circuit and measuring circuit galvanically isolated In accordance with IEC 255, VDE 0435 Section 303 **Input** | ---|--- Four adjustable measurement ranges: | AC 0.1 → 1A, AC 0.5 → 5A | AC 1 → 10A, AC 1.5 → 15A Test current rated frequency: | 50/60Hz Permitted Continuous current at terminal: | 20A at ambient temperature of 50°. Overload capacity: | 30A max. 3 s Hysteresis: | 4% of the adjusted value, permanent Accuracy: | ≤1% Time delay: | 0.1 → 20 s, adjustable Auxiliary voltage UH: | 220 → 240VAC, 50 / 60Hz Auxiliary voltage range: | 0.8 → 1.1uH **Output** | Contact assignment: | 1 changeove