new Magnetic switching sensor KT-50R KT50R 2M DC/AC 5-240V 100mA 10W 1Pcs

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What Is the KT-50R Magnetic Switching Sensor?

In short: The KT-50R (also marked KT50R) is a reed-type magnetic proximity sensor designed to detect the presence or position of a magnet-equipped target without physical contact. It operates across a remarkably wide voltage range of 5-240V AC/DC, making it a drop-in solution for both low-voltage control circuits and line-voltage signaling applications.

Magnetic switching sensors fill a critical niche in industrial automation where optical or inductive sensors struggle with dust, oil mist, or transparent targets. The KT-50R uses a hermetically sealed reed switch that activates when a permanent magnet enters its sensing zone. There are no exposed electrical contacts, no lens to clean, and no sensitivity adjustments to drift over time — just a simple, binary output that has served factories and machine builders reliably for decades.

The 2-meter integral cable simplifies wiring, eliminating the need for a separate connector and reducing installation time on conveyors, gate position monitors, pneumatic cylinder end-of-stroke detection, and safety interlock circuits.

Technical Specifications

Wide Voltage Range: A Design Advantage

One of the KT-50R's most compelling features is its 5-240V operating range spanning both AC and DC supplies. This eliminates voltage-matching headaches common with solid-state sensors. Whether your control cabinet runs on 24VDC PLC I/O, 120VAC relay logic, or 230VAC direct switching, the same sensor model covers all scenarios. Maintenance teams can standardize on one part number for multiple machine generations, dramatically reducing spare-parts inventory complexity.

Typical Deployment Scenarios

Reed-based magnetic sensors like the KT-50R excel in environments with high particulate contamination — woodworking shops, cement plants, grain handling, and metal stamping facilities. The non-contact sensing principle means no mechanical wear, while the sealed glass reed capsule shrugs off humidity, oil vapor, and non-ferrous dust. Common applications include door/gate closed confirmation, elevator car positioning, pneumatic cylinder end-stop sensing, and rotational speed counting with a magnet-equipped shaft collar.

Frequently Asked Questions

What type of magnet do I need to trigger the KT-50R?

Any permanent magnet of sufficient field strength will activate the reed switch. Neodymium magnets provide the strongest trigger at distance, but standard ferrite or alnico magnets also work when brought within the rated sensing gap. The exact activation distance varies with magnet size and material — testing with your specific magnet and mounting geometry is recommended during commissioning.

Can this sensor handle inductive loads like small relays directly?

The 100mA / 10W maximum rating means the KT-50R should not directly switch relay coils or contactors that exceed these limits. For inductive loads, use the sensor output to drive a solid-state relay or interposing relay with a coil current well below 100mA. Always include a flyback diode across DC inductive loads to prevent arcing at the reed contacts.

Is the KT-50R suitable for outdoor installation?

The glass reed capsule itself is environmentally sealed, and the epoxy-potted body provides moderate weather resistance. For outdoor use, mount the sensor inside a drip-proof enclosure and orient the cable entry downward to prevent water ingress along the cable jacket. Avoid direct UV exposure to the cable sheath over extended periods.

What is the switching frequency limit of this sensor?

Reed switches are mechanical devices, albeit miniature ones, and have a practical switching ceiling of roughly 200-400 Hz. For high-speed counting applications exceeding this rate, a Hall-effect sensor would be more appropriate. For door interlocks, cylinder stroke detection, and most automation tasks, the reed switch speed is more than adequate.

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