Current and Voltage Controls 1-Phase Max. and Min. Current Control Type H 479 • AC current metering relay • Measuring range: 0.5 - 500 AAC with 1-phase current metering transformer, type MI... • Upper and lower current limits separately adjustable • Output: 8 A DPDT relay • For mounting on DIN-rail in accordance with DIN/EN 50 022 • H4-housing • LED-indication for power supply and output ON • AC power supply Product Description 1-phase AC current metering relay. For mounting on DINrail. Adjustment of upper and lower current values possible. Ordering Key Often used where a reaction has to be taken e.g. when a motor exceeds the set value. Housing Type Output Power supply H 479 166 230 Type Selection Plug Output Supply: 24 VAC Supply: 115 VAC Supply: 230 VAC Screw terminals DPDT H 479 166 024 H 479 166 115 H 479 166 230 Input Specifications Output Specifications Input Terminals 7 & 8 Output Rated insulation voltage Overvoltage cat. III (IEC 60664) nom. voltage: 0.4-4 Vp max. 20 V from current transformer MI ... Impedance 9.9 kΩ Measuring ranges Range Max. current Types of current transformers AAC rms rms MI 5 0.5 - 5 20 AAC MI 20 2 - 20 50 MI 100 10 - 100 250 AAC MI 500 50 - 500 700 AAC Supply Specifications Power supply AC types Rated operational voltage Through term. 21 & 22 024 115 230 Voltage interruption Dielectric voltage Rated impulse withstand volt. Rated operational power Overvoltage cat. III (IEC 60664) (IEC 60038) 24 VAC ± 15%, 45 to 65 Hz 115 VAC ± 15%, 45 to 65 Hz 230 VAC ± 15%, 45 to 65 Hz ≤ 40 ms 2 kVAC (rms) (supply/elect.) 4 kV (1.2/50 µs) (line/neutral, line/line), no direct connection to electronics 2.5 VA Specifications are subject to change without notice (26.10.99) Contact ratings (AgCdO) Resistive loads AC 1 DC 1 or Small inductive loads AC 15 DC 13 Mechanical life Electrical life AC 1 DPDT relay 250 VAC (rms) (cont./elect., cont./cont.) µ (micro gap) 8 A/250 VAC (2000 VA) 0.4 A/250 VDC (100 W) 4 A/25 VDC (100 W) 2.5 A/230 VAC 5 A/24 VDC ≥ 30 x 106 operations ≥ 2.5 x 105 operations (at max. load) ≤ 7200 operations/h Operating frequency Dielectric strength ≥ 2 kVAC (rms) (cont./elect.) Dielectric voltage Rated impulse withstand volt. 4 kV (1.2/50 µs) (cont./elect.) (IEC 60664) 1 H 479 General Specifications Reaction time Indication for Power supply ON Output ON Environment Degree of protection Pollution degree Operating temperature Storage temperature Weight τ = 0.2 s, worst case reaction time may be up to 5 x τ LED, green LED, red (IEC 60947-1) IP 20 B/front IP 40 D (IEC 60529) 3 (IEC 60664) -20° to +50°C (-4° to +122°F) -50° to +85°C (-58° to +185°F) 300 g Mode of Operation The relay operates when the current is within set points (including hysteresis) and releases when the measured current drops below/exceeds the set points (under and over current monitoring). If the lower set point is set above the upper set point, the output relay releases and cannot be activated before the lower set point is set lower than the upper set point. Wiring Diagram µ Power supply H 479 Range Setting Range setting Right potentiometer: Upper limit adjustable from 10 to 100% of max. value of 4 Vp. PE = Term. 8 Accessories Hysteresis Approx. 1% of set point values. Current metering transformers MI 5, MI 20, MI 100, MI 500. For further information refer to "Current Metering Transformers". Left potentiometer: Lower limit adjustable from 8 to 98% of max. value of 4 Vp. Operation Diagram Power supply Upper limit Hysteresis Hysteresis Lower limit Relay ON 2 Specifications are subject to change without notice (26.10.99)