Current Transducer CT 5 .. 25-T IPN = 5 .. 25 A For very accurate measurements of currents : DC, AC, pulsed..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). 0632 Electrical data Primary nominal current Primary current, measuring range Conversion ratio I PN (A r.m.s.) I P (A) K N (A/V) 5 10 25 7.5 15 37.5 5 A/5 V 10 A/ 5 V 25 A/5 V VO U T RL CL tC VC IC Analog output voltage Load resistance Capacitance loading Output short-circuit duration 1) Supply voltage (± 5 %) Current consumption Features Type • Closed loop (compensated) current transducer • Insulated plastic case recognized CT 5-T CT 10-T CT 25-T 5 > 500 ≤5 ∞ ± 15 30 + VOUT / RL according to UL 94-V0 • Patent pending. V Ω nF s V mA Accuracy - Dynamic performance data XG Overall accuracy @ I PN - 25°C .. + 70°C ± 0.1 % VO Offset voltage @ I P = 0 TA = 25°C - 25°C .. + 70°C Max ± 0.4 ± 0.6 mV mV f tr Frequency bandwidth (- 3 dB) @ 10 % of I PN Response time DC .. 500 <1 kHz µs Advanced features • f = 500 kHz • X G = ± 0.1 % (- 25°C .. + 70°C). Advantages • • • • • • • Excellent accuracy Very good linearity Low temperature drift Optimized response time Wide frequency bandwidth No insertion losses High immunity to external interference • Current overload capability. Applications • AC variable speed drives and servo General data TA TS m motor drives Ambient operating temperature Ambient storage temperature Mass Standards - 25 .. + 70 °C - 40 .. + 85 °C 670 g EN 50178 : 1996 • Static converters for DC motor drives • Battery supplied applications • Uninterruptible Power Supplies (UPS) • Switched Mode Power Supplies (SMPS) • Power supplies for welding applications. Note : 1) If the short-circuit has a duration more than 1 s, the primary current of the supply voltage must be interrupted for a short time to restore the transducer to proper working order. The internal protection is done by PTC resistors. Application domain • Industrial. Page 1/3 060927/0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. w w w .lem.com Current Transducer CT 5 .. 25-T Isolation characteristics Vd VW R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn Impulse withstand voltage 1.2/50 µs 6 > 9.5 kV kV dCp dCl CTI Creepage distance 5) Clearance distance Comparative Tracking Index (Group III b) Min 104.5 104.5 225 mm mm Application examples According to EN 50178 and IEC 61010-1 standards and following conditions : • Over voltage category OV 3 • Pollution degree PD2 • Non-uniform field EN 50178 IEC 61010-1 Rated isolation voltage Nominal voltage Single isolation 1000 V 1000 V Reinforced isolation 600 V 600 V dCp, dCI, V W Note : 5) Between M5 screws and M5. Safety This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturer's operating instructions. Caution, risk of electrical shock When operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary busbar, power supply). Ignoring this warning can lead to injury and/or cause serious damage. This transducer is a built-in device, whose conducting parts must be inaccessible after installation. A protective housing or additional shield could be used. Main supply must be able to be disconnected. Page 2/3 060927/0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. w w w .lem.com Dimensions CT 5 .. 25-T (in mm. 1 mm = 0.0394 inch) Front view Left view Connection Top view Mechanical characteristics • General tolerance • Transducer fastening • Connection of primary • Connection of secondary • Fastening torque Remarks ± 0.3 mm 2 holes M5 screws 2 steel screws M5 M5 threaded studs M5 threaded studs 2.2 Nm or 1.62 Lb - Ft • VOUT is positive when IP flows in the direction of the arrow. • This transducer induces into the primary circuit a square wave of 70 mV amplitude (frequency ≈ 220 Hz). This voltage can induce an AC current in the primary if the primary impedance is low. • This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. Page 3/3 060927/0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. w w w .lem.com