0.2–30A Adjustable AC Current Sensing Switch – Non-Contact Monitoring
Need to monitor your motor, pump, or inverter without cutting wires or adding a separate power supply? The M3050/M3056 current sensing module is the perfect solution. Installation takes just minutes: simply pass your conductor through the Ø10 mm aperture, and the sensor handles the rest.
Note: The module output is a control signal (max. 0.3A / 240V AC/DC) intended for automation systems, not for direct power switching. The monitored conductor does not need to be cut; it is simply passed through the sensor’s aperture.
Why choose this model? (Key Advantages):
- Adjustable 0.2–30A threshold — Versatile enough to cover everything from lighting circuits to industrial motors with a single device.
- Self-powered via magnetic field — No external power supply required, reducing wiring complexity and keeping your electrical cabinet tidy.
- Solid-state electronic switching — No moving parts means no mechanical wear and virtually unlimited switching cycles.
- Full galvanic isolation — The monitored circuit and the control output are completely separated, protecting your PLC or alarm system.
- High precision and overload capacity — Features sub-1% lag and 100% overload tolerance, ensuring it handles motor start-up surges without failure.
- Flame-retardant PC housing — Durable construction resistant to high temperatures (-20°C to +55°C), ideal for industrial or protected outdoor electrical enclosures.
Performance and Technical Details
Operating on the principle of a toroidal current transformer, the monitored conductor acts as the primary winding, while the induced energy powers the internal circuit directly—no batteries or auxiliary 24V power required. The trigger threshold is precisely set via an integrated potentiometer, offering fine resolution across the entire 0.2–30A range. The 0.3A / 240V AC or DC output is sufficient to trigger an auxiliary contactor, PLC input, or alarm module. Its extended operating temperature range of up to +55°C makes it suitable for high-density electrical panels.
| Parameter | Specification |
|---|---|
| Available Models | M3050 (NO), M3056 (NC) |
| Detection Range | 0.2 – 30A AC |
| Output Contact Type | NO (M3050) / NC (M3056) |
| Output Capacity | 0.3A max. / 240V AC or DC |
| Measurement Principle | Magnetic induction (toroidal transformer) |
| Power Supply | Self-powered via magnetic field |
| Aperture Diameter | Ø 10 mm |
| Lag (Delay) | < 1% |
| Overload Capacity | 100% |
| Operating Temperature | -20°C … +55°C |
| Housing Material | Flame-retardant PC (polycarbonate) |
| Typical Applications | Motors, pumps, compressors, PV, UPS, electrical panels |
Setup and Programming Instructions
- Pass the monitored conductor (single phase wire only) through the Ø10 mm aperture. No cutting or modification of the cable is required.
- Connect the module output (signal terminals) to your control circuit: PLC, auxiliary contactor, alarm system, or other load up to 0.3A / 240V.
- Power on the monitored circuit at the desired minimum load and rotate the potentiometer clockwise until the relay switches.
- Verify operation: For M3050 (NO) — output closes when current exceeds the threshold; for M3056 (NC) — output opens when the threshold is exceeded.
- Test at nominal load to confirm the threshold is set correctly and to ensure no false triggering occurs.
Package Contents
- 1 x Current sensing module M3050 (NO) or M3056 (NC) — depending on the selected variant
Frequently Asked Questions
What is the difference between the M3050 and M3056?
The M3050 features a Normally Open (NO) output contact—the circuit closes when the current exceeds the set threshold. The M3056 features a Normally Closed (NC) contact—the circuit opens when the threshold is exceeded. Choose based on your automation logic.
Does it require an external power supply?
No. The module is self-powered by the magnetic field of the monitored conductor using current transformer technology. No extra power wiring is needed.
Can I monitor DC current with this sensor?
No. This sensor is designed exclusively for AC current via magnetic induction. While the control output can handle both AC and DC (max. 0.3A / 240V), the conductor being monitored must be AC.
Can it be used for a three-phase motor?
Yes. Pass a single phase wire through the sensor aperture. For full three-phase monitoring, use three independent modules, one for each phase.
What is the maximum conductor diameter?
The aperture is Ø 10 mm. Please ensure the entire cable, including insulation, fits within this diameter.
Is it suitable for PV or UPS systems?
Yes, provided the monitored circuit is AC—such as the output of an inverter or UPS. It is frequently used in electrical panels, PV inverter systems, and industrial installations for consumption monitoring and overload protection.
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