LF2005-S/SP21，LF 2005-S/SP21

‌LF2005-S/SP21 Product Description — The Standard-Benchmark Current Sensor for Industrial Reliability

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LF2005-S/SP21 ‌Core Advantage: Proven Simplicity, Engineered for Consistency‌
The LF2005-S/SP21 is the foundational model in LEM’s LF2005-S closed-loop Hall current sensor family — designed not for advanced features, but for uncompromised core performance. Where other variants add IO-Link, specialized connectors, or extended temperature derating, the SP21 delivers ‌±0.3% accuracy‌ with zero compromise on stability, isolation, or response time. It is the go-to choice for engineers who prioritize predictable behavior, long-term durability, and seamless compatibility across legacy and modern control systems — without the cost premium of over-engineered alternatives.

LF2005-S/SP21 ‌Key Features: Built on Decades of Industrial Trust‌

‌Closed-Loop Hall Technology‌: Active magnetic feedback ensures ‌±0.3% accuracy‌ under dynamic loads — eliminating drift and hysteresis even during rapid transients from VFDs, inverters, and PWM-driven motors.

‌Split-Core Clamp Design‌: Enables safe, non-intrusive installation on live conductors — ideal for maintenance windows, retrofit upgrades, and continuous-operation environments where downtime is unacceptable.

‌Dual-Polarity Supply Compatibility‌: Operates reliably across ‌±15 V to ±24 V‌ — directly compatible with industrial DC buses, UPS systems, and mixed-voltage control panels without external regulators.

‌Industrial-Grade Robustness‌: Encased in ‌UL 94-V0‌ flame-retardant housing with ‌IP54‌ ingress protection — fully functional from ‌-40°C to +85°C‌, ensuring stable operation in unheated enclosures, outdoor substations, and high-vibration production lines.

‌Galvanic Isolation‌: Provides ‌6 kV RMS‌ isolation, certified to ‌EN 50178‌, safeguarding control electronics and personnel in high-voltage applications such as traction drives, battery arrays, and DC distribution networks.

‌Direct 400 mA Current Output‌: Delivers a clean, linear signal compatible with PLCs, DCS, and SCADA inputs — eliminating the need for external signal conditioning, reducing wiring complexity, and accelerating commissioning.

LF2005-S/SP21 ‌Technical Specifications‌

‌Rated Current‌: 2000 A (RMS)

‌Measurement Range‌: ±3000 A (DC, AC, Pulse)

‌Output Type‌: Current output (400 mA nominal)

‌Supply Voltage‌: ±15 V to ±24 V (dual polarity)

‌Accuracy‌: ±0.3% at 25°C

‌Linearity‌: ±0.1%

‌Response Time‌: <1 µs

‌Isolation Voltage‌: 6 kV RMS

‌Operating Temperature‌: -40°C to +85°C

‌Installation‌: Split-core clamp, compatible with Molex and JST industrial connectors

‌Protection Rating‌: IP54

‌Certifications‌: CE, RoHS, EN 50178

‌Warranty‌: Global 5-year warranty

LF2005-S/SP21 ‌Applications: Powering Precision Across Critical Industries‌

‌Rail Traction Systems‌: Monitors DC link and motor currents in metro, tram, and locomotive propulsion — enabling real-time fault detection, regenerative braking control, and predictive maintenance without interrupting service.

‌Battery Energy Storage (BESS)‌: Tracks charge/discharge currents in lithium-ion and flow battery stacks — supporting cell balancing algorithms, thermal runaway prevention, and grid compliance in utility-scale installations.

‌Industrial Automation & Robotics‌: Integrates into servo drives and PLCs for closed-loop current regulation — improving motion precision, reducing motor wear, and minimizing unplanned downtime in high-speed production lines.

‌Renewable Energy Inverters‌: Measures DC input and AC output in solar and wind systems — enabling maximum power point tracking (MPPT), grid synchronization, and fault isolation under fluctuating environmental conditions.

‌High-Power Industrial Converters‌: Used in rectifiers, choppers, and DC-DC converters — ensuring stable feedback for precise power delivery in electroplating, electrolysis, and heavy-duty motor drives.

‌Uninterruptible Power Supplies (UPS)‌: Monitors DC bus and inverter output currents in data centers and telecom facilities — preventing cascading failures and ensuring seamless transition during grid disturbances.

‌Why Choose LF2005-S/SP21?‌

‌The Standard for Interchangeability‌: Shares identical mechanical footprint, pinout, and documentation with SP24, SP27, and SP28 — enabling effortless replacement, simplified inventory, and future-proofed system upgrades without retraining or redesign.

‌Zero-Downtime Installation‌: Install or replace without de-energizing circuits — preserving production schedules and minimizing operational disruption in mission-critical environments.

‌Thermal Stability Without Derating‌: Maintains ±0.3% accuracy across the full -40°C to +85°C range — no performance degradation in unconditioned enclosures or outdoor installations.

‌Cost-Optimized Reliability‌: Delivers the same precision and isolation as premium variants — but without the added cost of non-essential features. It’s not the most advanced model. It’s the most reliable one.

‌Proven Long-Term Performance‌: Backed by LEM’s 50+ years of closed-loop Hall technology — engineered for continuous operation under stress, delivering maximum service life and minimal field failures.