Proximity NJK-5002C(NPN) Switch Hall Sensor

The NJK-5002C is a 3-wire, unipolar NPN Normally Open (NO) Hall Effect magnetic proximity switch. It triggers a digital low output signal whenever the south pole (S) of a permanent magnet comes within its 10mm detection range.Technical Specifications

• Operating Voltage: 5V to 30V DC.
• Detection Distance: 0 to 10 mm.
• Output Current Limit: 150mA to 200mA maximum.
• Output Type: NPN Open Collector, Normally Open (NO).
• Form Factor: Cylindrical M12 threaded body.
• Built-in Indicator: Integrated rear red LED.

3-Wire Pinout & Wiring ConfigurationThe sensor features a standard industrial three-wire color code:

• Brown Wire: Positive Supply Voltage (+VCC).
• Blue Wire: Ground/Negative (GND).
• Black Wire: Signal Output Pin.

How the NPN Output WorksBecause this is an NPN Normally Open (NO) sensor, the output state behaves as follows:

1. Idle State (No Magnet): The internal open-collector transistor is OFF. The black wire floats high.
2. Active State (Magnet Present): When a south-pole magnetic field is within 10mm, the transistor turns ON and switches the black output wire directly to Ground (0V). The red LED turns on.