Closed loop current transducer LEM LF210-S for accurate measurement of DC AC and pulsed currents in industrial applications
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Product Description
Product Overview
The LEM LF 210-S is a closed-loop current transducer designed for the electronic measurement of DC, AC, and pulsed currents. It provides galvanic separation between the primary and secondary circuits, making it suitable for applications requiring high accuracy and very low offset drift over temperature. Its panel mounting design and robust features make it ideal for industrial environments.
Product Attributes
- Brand: LEM International SA
- Product Name: Current Transducer LF 210-S
- Origin: Switzerland
- Certifications: IEC 61010-1: 2010, IEC 61800-5-1: 2007, IEC 62109-1: 2010, UL 508: 2013, UL 508 (USR), CSA C22.2 No. 14-13 (CNR)
- Application Domain: Industrial
- Case Material: V0 (According to UL 94)
Technical Specifications
| Parameter | Symbol | Unit | Min | Typ | Max | Conditions |
| Absolute Maximum Ratings | ||||||
| Maximum supply voltage (working) | ±UC max | V | ±15.75 | (40 °C … 85 °C) | ||
| Maximum primary conductor temperature | TB max | °C | 100 | |||
| Maximum steady state primary current | IP N max | A | 200 | (40 °C … 85 °C) | ||
| UL 508: Ratings and Assumptions of Certification | ||||||
| Primary involved potential | V AC/DC | 1500 | ||||
| Maximum surrounding air temperature | °C | 85 | ||||
| Primary current | A | 0 | 200 | |||
| Secondary supply voltage | V DC | 0 | ±15.75 | |||
| Secondary current | mA | 0 | 100 | |||
| Insulation Coordination | ||||||
| RMS voltage for AC insulation test, 50 Hz, 1 min | Ud | kV | 3.5 | Type test | ||
| Impulse withstand voltage 1.2/50 µs | UNi | kV | 8.8 | According to IEC 61800-5-1 | ||
| Partial discharge RMS test voltage (qm < 10 pC) | Ut | kV | 1.65 | Test carried out with a non insulated bar and completely filling the primary hole. According to IEC 61800-5-1 | ||
| Clearance (pri. - sec.) | dCI | mm | 10.2 | Shortest distance through air | ||
| Creepage distance (pri. - sec.) | dCp | mm | 11 | Shortest path along device body | ||
| Rated insulation RMS voltage (Basic) | UNm | V | 1000 | According to IEC 61800-5-1, CAT III, PD2 | ||
| Rated insulation RMS voltage (Reinforced) | UNm | V | 600 | According to IEC 61800-5-1, CAT III, PD2 | ||
| Comparative tracking index | CTI | 600 | ||||
| Environmental and Mechanical Characteristics | ||||||
| Ambient operating temperature | TA | °C | -40 | 85 | ||
| Ambient storage temperature | TS | °C | -50 | 90 | ||
| Mass | m | g | 75 | |||
| Electrical Data (At TA = 25 °C, ±UC = ±15 V, RM = 1 Ω, unless otherwise noted) | ||||||
| Primary nominal RMS current | IP N | A | 200 | * | ||
| Primary current, measuring range | IP M | A | -420 | 420 | * With ±UC = ±15 V | |
| Measuring resistance | RM | Ω | 0 | Max value of RM is given in Figure 1 | ||
| Secondary nominal RMS current | IS N | A | -0.1 | 0.1 | * | |
| Resistance of secondary winding | RS | Ω | 27 | RS (TA) = RS × (1 + 0.004 × (TA + Δtemp−25)) | ||
| Secondary current | IS | A | -0.21 | 0.21 | * | |
| Number of secondary turns | NS | 2000 | ||||
| Nominal sensitivity | SN | mA/A | 0.5 | |||
| Supply voltage | ±UC | V | ±11.4 | ±15 | ±15.75 | * |
| Current consumption | IC | mA | 33 + IS | 35 + IS | ±UC = ±12 V / ±UC = ±15 V | |
| Offset current, referred to primary | IO | A | -0.15 | 0.15 | ||
| Temperature variation of IO, referred to primary | IO T A | µA | -0.2 | 0.2 | * | |
| Magnetic offset current (@ 3 × IP N), referred to primary | IO M | A | ±0.2 | |||
| Sensitivity error | εS | % | -0.1 | 0.1 | * | |
| Linearity error | εL | % of IP N | -0.05 | 0.05 | * | |
| Total error at IP N | εtot | % of IP N | -0.2 | 0.2 | 0.2 | * 25 … 85 °C / -40 … 85 °C |
| RMS noise current referred to primary | Ino | mA | 20 | 1 Hz to 100 kHz (see Figure 4) | ||
| Delay time @ 10 % of IP N | tD | µs | < 0.5 | 0 to 200 A, 75 A/µs, RM = 10 Ω | ||
| Delay time @ 90 % of IP N | tD 90 | µs | < 0.5 | 0 to 200 A, 75 A/µs, RM = 10 Ω (see Figure 2) | ||
| Frequency bandwidth | BW | kHz | 100 | RM = 50 Ω; -3 dB | ||
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