A74-11

Current and Voltage Controls Current Transformer, 3-Phase Types A 74-10, A 74-11 • 3-phase current metering transformers for use with current control relays • Measuring ranges: A 74-10 5: 0.5 5 AAC A 74-10 20: 2 - 20 AAC A 74-11 100: 10 - 100 AAC A 74-11 500: 50 - 500 AAC Product Description 3-phase current transformer measures on all three phases. Output voltage proportional to measured amplitude of the rms-value of the normal phase current. Ordering Key Type Input current A 74-10 5 Type Selection Input current 5 AAC 20 AAC 100 AAC 500 AAC Type no. A 74-10 5 A 74-10 20 A 74-11 100 A 74-11 500 Input Specifications A 74-10 5 Current range Max. current (continuously) Max. overload current (t = 30 s) Rated insulation voltage Input-output Overvoltage category Dielectric strength Dielectric voltage Rated impulse withstand volt. Power consumption 0.5 - 5 AAC 20 AAC 40 AAC 1000 VACrms IV (IEC 60664) 6 kVACrms 12 kV (1.2/50 µs) < 0.1 W@5 A A 74-10 20 2 - 20 AAC 50 AAC 85 AAC 1000 VACrms IV (IEC 60664) 6 kVACrms 12 kV (1.2/50 µs) < 0.25 W@20 A A 74-11 100 10 - 100 AAC 250 AAC 325 AAC 1000 VACrms IV (IEC 60664) 6 kVACrms 12 kV (1.2/50 µs) < 1.5 W@100 A A 74-11 500 50 - 500 AAC 750 AAC 1000 AAC 1000 VACrms IV (IEC 60664) 6 kVACrms 12 kV (1.2/50 µs) < 21 W@1500 A Output Specifications A 74-10 5 Output voltage (TA = 20°C = 68°F), RL = 9.5 kΩ) Output impedance Tolerance of output voltage @ rated input current Temperature variation Rated insulation voltage (cable) A 74-10 20 A 74-11 100 A 74-11 500 0.4 - 4 Vp < 700 Ω ± 5% ± 0.1% per °C 250 VACrms 0.4 - 4 Vp < 200 Ω ± 5% ± 0.1% per °C 250 VACrms 0.4 - 4 Vp < 40 Ω ± 5% ± 0.1% per °C 250 VACrms 0.4 - 4 Vp < 10 Ω ± 5% ± 0.1% per °C 250 VACrms Specifications are subject to change without notice (19.07.06) 1 A 74-10, A 74-11 General Specifications Pollution degree Ambient temperature Housing A74-10 Dimensions A74-11 Material Weight A 74-10 A 74-11 Connection cable Approval CE Marking 3 (IEC 60664) - 20 to + 60°C (- 4 to + 140°F) 120 x 45 x 16 mm 150 x 114 x 23 ABS 200 g 750 g 2 m PVC, 4 x 0.4 mm2 UL Yes Mode of Operation The current metering transformer is connected to the current control relays H 475 as follows: Red core to term. 5 White core to term. 6 Yellow core to term. 7 Black core to term. 8. (starpoint - neutral). - U1. - U2. - U3. ductor through the hole several times makes it possible to meter currents below the nominal range. If the conductor is drawn through the central hole e.g. 5 times, the metering transformer will register 50 A when the current in the conductor is 10 A. In amplitude and phase the output voltage is proportional to the phase current metered. The metered conductor is drawn through the central hole of the current metering transformer. Drawing the con- Wiring Diagrams Input current Correct connection Output voltage U1 Red Black U3 Yellow Incorrect connection U1 Red U2 White Black U3 Yellow U2 White Red White Yellow Black Dimensions A 74-10 .. A 74-11 .. 2 Specifications are subject to change without notice (19.07.06)