MAGREED 2538 Magnetic Proximity Sensor - NO/NC/Changeover, 18" Cable

The MAGREED 2538 uses a simple reed switch, so it does not have a built-in operating voltage. The voltage and current ratings depend entirely on the external circuit you connect it to. Typical reed switches can handle low-voltage DC or AC signals from logic-level 3.3V/5V up to 24V, with current ratings often in the range of 0.5A to 1A. Always consult the specific datasheet for the reed switch component inside for maximum ratings.

The sensor features SPDT (Single Pole Double Throw) or changeover contacts. For NO operation, wire your circuit between the Common (C) and Normally Open (NO) terminals. For NC operation, wire between the Common (C) and Normally Closed (NC) terminals. The 18-inch cable typically has three wires corresponding to C, NO, and NC. A magnetic field near the sensor will switch the state between these contacts.

Yes, but with limitations. The magnetic field can penetrate non-ferrous materials like plastic, aluminum, glass, or wood, allowing the actuator magnet and sensor to be mounted on opposite sides of an enclosure. However, ferrous metals (like steel or iron) will shield or significantly distort the magnetic field, preventing reliable operation. The specified 15–20mm operating distance assumes air or non-ferrous material separation.

For reliable operation at the full 15–20mm distance, you should use a magnet with sufficient strength, typically a neodymium (rare earth) magnet. The exact size and grade (e.g., N52) will depend on the required gap and mounting configuration. It is recommended to test with the specific magnet in your application to ensure consistent switching at the desired distance.