Industrial Power Monitoring Solution – Honeywell CSNS300M-500 | CSNS Series Current Sensor
In high-stakes industrial environments — from motor drive cabinets to large-scale UPS systems — accurate, real-time current measurement is not optional. The Honeywell CSNS300M-500 is a closed-loop Hall-effect current sensor engineered for demanding applications where measurement accuracy, electrical isolation, and long-term reliability are critical. Specified by engineers worldwide, this CSNS Series sensor delivers consistent performance across the full lifecycle of your installation.
Where This Product Is Used
The CSNS300M-500 is deployed across a wide range of industrial and commercial power applications:
- Variable Frequency Drives (VFDs) & Motor Drives — Phase current feedback for precise motor speed and torque control in pumps, fans, compressors, and conveyors
- Uninterruptible Power Supplies (UPS) — Battery charge/discharge current monitoring and overload protection in data centers and critical infrastructure
- Solar & Renewable Energy Inverters — DC bus and AC output current sensing in string inverters and central inverters up to utility scale
- Industrial Welding Equipment — Real-time current feedback for arc stability and weld quality control
- EV Charging Stations (EVSE) — Charge current measurement and ground fault detection in Level 2 and DC fast chargers
- Power Distribution Units (PDUs) — Branch circuit monitoring in industrial switchgear and MCC panels
- Battery Management Systems (BMS) — State-of-charge estimation and cell balancing current measurement in lithium-ion battery packs
- Servo Drive Systems — High-bandwidth current loop feedback for CNC machines and robotics
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | CSNS300M-500 |
| Series | CSNS |
| Manufacturer | Honeywell Sensing & Productivity Solutions |
| Nominal Current (IPN) | 300 A RMS |
| Measuring Range | ±500 A peak |
| Sensing Technology | Closed-Loop Hall Effect (Flux Gate) |
| Output Type | Analog Voltage |
| Supply Voltage | ±15 VDC (±5%) |
| Accuracy | <1% at nominal current |
| Bandwidth (−3 dB) | DC to 100 kHz |
| Isolation Voltage | 3 kV RMS (50 Hz, 1 min) |
| Operating Temperature | −25°C to +85°C |
| Aperture | 30 mm × 10 mm |
| Mounting | PCB / Panel Mount |
| Output Connector | 5-pin connector |
| Weight | Approx. 100 g |
| RoHS Compliance | Yes |
Why Engineers Specify This Model
- Closed-Loop Accuracy — Flux-gate compensation technology achieves <1% accuracy across the full temperature range, outperforming open-loop alternatives in precision-critical loops
- Wide Bandwidth — DC to 100 kHz response enables detection of high-frequency switching transients in IGBT-based inverters and fast-switching converters
- Galvanic Isolation — 3 kV RMS isolation protects sensitive control electronics from high-voltage power circuits, meeting IEC 61010 safety requirements
- Large Aperture — 30 mm × 10 mm window accommodates large-gauge busbars and multi-conductor cables without derating
- Bidirectional Measurement — Measures both positive and negative current flow, essential for regenerative drives and bidirectional DC-DC converters
- Proven Honeywell Reliability — CSNS Series sensors are used in millions of installations globally, with a documented MTBF exceeding 500,000 hours
Complete System Bill of Materials
For a complete motor drive or inverter current sensing loop, engineers typically specify the following alongside the CSNS300M-500:
- Dual-rail ±15 VDC power supply (e.g., Meanwell SD-25D-15)
- Shielded signal cable (twisted pair, 0.5 mm²) for analog output wiring
- Anti-aliasing filter capacitor (100 nF, 50 V, X7R) at ADC input
- Busbar or cable routing hardware for 30 mm aperture
- DIN rail mounting bracket (if panel-mount installation)
- Honeywell CSNS Series mating connector (5-pin, 2.54 mm pitch)
Compliance & Industry Standards
- RoHS 2011/65/EU — Compliant; no restricted hazardous substances
- IEC 61010-1 — Safety requirements for electrical equipment for measurement, control, and laboratory use
- IEC 60068 — Environmental testing (temperature, humidity, vibration)
- CE Marking — Meets EU EMC Directive 2014/30/EU requirements
- UL Recognition — Recognized component under UL 508 (Industrial Control Equipment)
Quality Assurance & Sourcing
Konmask.com sources the CSNS300M-500 exclusively through authorized Honeywell distribution channels and verified industrial surplus networks. Every unit undergoes incoming inspection including:
- Visual inspection for label authenticity and package integrity
- Date code and lot traceability verification
- Functional output verification against Honeywell datasheet specifications
- Anti-static packaging for safe transit
We provide full traceability documentation upon request. Counterfeit-free guarantee backed by our sourcing policy.
How to Source This Part
- In-Stock Orders — Add to cart and check out directly. Ships within 1–3 business days from our warehouse.
- Bulk / Project Quantities — Contact us at support@konmask.com for volume pricing and lead time confirmation.
- Urgent Requirements — Call or WhatsApp +0086 19859288691 for same-day quotation on critical project needs.
- Custom Kitting — We can pre-kit CSNS300M-500 with associated BOM components for your production line.
Application-Specific FAQ
Q: Can the CSNS300M-500 measure DC current as well as AC?
A: Yes. As a closed-loop Hall-effect sensor, it measures DC, AC, and complex waveforms from 0 Hz to 100 kHz with equal accuracy.
Q: What is the output voltage range at ±500 A?
A: The analog output spans ±4 V at the ±500 A measuring range (with ±15 V supply). Verify exact transfer function in the Honeywell CSNS Series datasheet.
Q: Is this sensor suitable for use in a 690 V AC motor drive?
A: Yes. The 3 kV RMS isolation rating provides adequate margin for 690 V AC systems per IEC 61010 overvoltage category requirements.
Q: Can I use a single +5 V supply instead of ±15 V?
A: No. The CSNS300M-500 requires a dual ±15 VDC supply for the compensation circuit. Single-supply operation is not supported by this model.
Q: What is the aperture size and what conductor sizes fit?
A: The aperture is 30 mm × 10 mm, accommodating busbars up to 25 mm × 8 mm or multiple cables up to 35 mm² cross-section.
Q: How does this compare to a shunt resistor for current measurement?
A: Unlike shunt resistors, the CSNS300M-500 provides full galvanic isolation, zero insertion loss on the power circuit, and no I²R heating — making it the preferred choice for high-current, safety-critical applications.
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