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Specifications
Mfr. Part #:
LF305-S
Key Attributes
Model Number:
LF305-S
Product Description
Product Overview
The LEM LF 305-S is a closed-loop (compensated) current transducer utilizing Hall effect technology for the electronic measurement of DC, AC, and pulsed currents. It provides galvanic separation between the primary and secondary circuits. Designed for industrial applications, it offers excellent accuracy, very good linearity, low temperature drift, optimized response time, and a wide frequency bandwidth with no insertion losses and high immunity to external interference. Its insulating plastic case is recognized according to UL 94-V0.
Product Attributes
- Brand: LEM
- Material: Insulating plastic case (UL 94-V0)
- Certifications: EN 50178: 1997, UL 508: 2010
Technical Specifications
| Parameter | Value | Unit | Notes |
| Primary nominal rms current (IPN) | 300 | A | |
| Primary current, measuring range | 0 .. 500 | A | |
| Secondary nominal rms current (ISN) | 150 | mA | |
| Conversion ratio (KN) | 1 : 2000 | ||
| Supply voltage (UC) ( 5 %) | 12 .. 20 | V | |
| Current consumption (IC) | 26 (+ IS) | mA | @ 20 V |
| Overall accuracy @ IPN, TA = 25 C (XG) | 0.5 | % | |
| Linearity error (L) | < 0.1 | % | Typ |
| Offset current @ IP = 0, TA = 25 C (IO) | 0.2 | mA | Typ |
| Magnetic offset current @ IP = 0 (IOM) | 0.2 | mA | Max, after 3 x IPN overload |
| Temperature variation of IO (-10 C .. +70 C) | 0.1 .. 0.3 | mA | |
| Temperature variation of IO (-40 C .. +85 C) | 0.2 .. 0.7 | mA | |
| Reaction time to 10 % of IPN (tra) | < 500 | ns | |
| Step response time to 90 % of IPN (tr) | < 1 | s | 2) With a di/dt of 100 A/s. |
| di/dt accurately followed | > 100 | A/s | |
| Frequency bandwidth (- 1 dB) (BW) | DC .. 100 | kHz | |
| Ambient operating temperature (TA) | - 40 .. + 85 | C | |
| Ambient storage temperature (TS) | - 40 .. + 85 | C | |
| Resistance of secondary winding (RS) @ TA = 70 C | 30 | ||
| Resistance of secondary winding (RS) @ TA = 85 C | 32 | ||
| Mass | 95 | g | |
| Rms voltage for AC insulation test (Ud) | 3.8 | kV | 50 Hz, 1 min |
| Impulse withstand voltage (W) | 10 | kV | 1.2/50 s |
| Creepage distance (dCp) | 11.1 | mm | |
| Clearance (dCI) | 10.6 | mm | |
| Comparative tracking index (CTI) | 175 | (group IIIa) | |
| Primary through-hole diameter | 20.1 | mm |
2410121619_LEM-LF305-S_C454783.pdf
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