lem www .lem.com page 1/3 lem reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. 070424/9 current transducer lf 306-s for the electronic measurement of currents : dc, ac, pulsed..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). electrical data i pn primary nominal r.m.s. current 300 a i p primary current, measuring range 0 .. 500 a r m measuring resistance r m min r m max with 12 v @ 300 a max 0 37 w @ 500 a max 0 8 w with 15 v @ 300 a max 10 56 w @ 500 a max 10 20 w i sn secondary nominal r.m.s. current 150 ma k n conversion ratio 1 : 2000 v c supply voltage ( 5 %) 12 .. 15 v i c current consumption 20 ( @ 15 v ) + i s ma accuracy - dynamic performance data x g overall accuracy @ i pn , t a = 25c 0.4 % e l linearity error < 0.1 % typ max i o offset current @ i p = 0, t a = 25c 0.20 ma i om residual current 1) @ i p = 0, after an overload of 3 x i pn 0.08 ma i ot thermal drift of i o - 25c .. + 70c 0.20 0.64 ma t ra reaction time @ 10 % of i p max < 500 ns t r response time 2) @ 90 % of i pn < 1 s di/dt di/dt accurately followed > 100 a / s f frequency bandwidth (- 1 db) dc .. 100 khz general data t a ambient operating temperature - 25 .. + 70 c t s ambient storage temperature - 40 .. + 90 c r s secondary coil resistance @ t a = 70c 34 w m mass 60 g standards en 50178 : 1997 notes : 1) the result of the coercive field of the magnetic circuit 2) with a di/dt of 100 a/s. features closed loop (compensated) current transducer using the hall effect insulated plastic case recognized according to ul 94-v0. 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 motor drives static converters for dc motor drives battery supplied applications uninterruptible power supplies (ups) switched mode power supplies (smps) power supplies for welding applications. application domain industrial. i pn = 300 a 16130
lem www .lem.com page 2/3 lem reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. 070424/9 current transducer lf 306-s isolation characteristics v d r.m.s. voltage for ac isolation test, 50/60 hz, 1 mn 6 kv v w impulse withstand voltage 1.2/50 s >7.3 kv min dcp creepage distance 8 mm dcl clearance distance 7.15 mm cti comparative tracking index (group i i i a ) 175 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 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. en 50178 iec 61010-1 dcp, dci, rated isolation voltage nominal voltage single isolation 600 v 600 v reinforced isolation 300 v 300 v v w
lem www .lem.com page 3/3 lem reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. 070424/9 mechanical characteristics general tolerance 0.5 mm fastening transducer flat position 2 holes ? 6.6 mm 2 m6 steel screws recommended fastening torque 4.2 nm or 3.1 lb.-ft. or 2 holes ? 2.25 mm 2 x pt ka25 screws recommended fastening torque 0. 3 nm or 0. 22 lb.-ft. vertical position 2 holes ? 4.3 mm 2 m4 steel screws recommended fastening torque 3 nm or 2. 21 lb. - ft. or 2 holes ? 2.25 mm 2 x pt ka25 screws recommended fastening torque 0. 3 nm or 0. 22 lb.-ft. primary through-hole 25.5 x 25.5 mm connection of secondary molex 5045-03/ag dimensions lf 306-s (in mm. 1 mm = 0.0394 inch) bottom view right view back view front view connection remarks i s is positive when i p flows in the direction of the arrow. temperature of the primary conductor should not exceed 100c. dynamic performances (di/dt and response time) are best with a single bar completely filling the primary hole. this is a standard model. for different versions (supply voltages, turns ratios, unidirectional measurements...), rep. clearance creepage a-b 7.15 mm 8.00 mm
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