Product Description

Flush-mount electric bolt lock, model 150A-NC, designed for access control on wooden, metal, or PVC doors. The NC (Normally Closed) version is fail-safe: it unlocks when power is removed (POWER OFF) and remains locked while powered. The electromagnetic design uses low-remanence materials for stable, long-life operation, and the compact body allows a discreet installation in the frame. Compatible with access controllers, intercoms, and exit buttons; provides status feedback via signal wires.

Technical Details

• Model: 150A-NC
• Type: electric bolt lock (cathode lock), flush-mount installation
• Operating mode: NC — opens on power loss (POWER OFF)
• Supply voltage: 12 VDC (optional 24 VDC)
• Rated current (12 V, NC): ≈ 100 mA
• Body dimensions: 149 × 28 × 34 mm
• Signaling/feedback (wires):
  • Yellow: public/common line
  • Door closed: blue–yellow connected
  • Door open: white–yellow connected
• Wiring notes:
  • Includes a diode for surge protection (install across the coil, observing polarity).
  • Use a stabilized power supply and adequately sized cable to avoid voltage drop.

Wiring & Sample Code

Connections (NPN transistor drive):
Arduino D8 → 1 kΩ resistor → transistor base (2N2222); emitter → GND; collector → one coil terminal; the other coil terminal → +12 V. Flyback diode across the coil (cathode to +12 V, anode to transistor side). Arduino GND common with the 12 V supply GND.

const byte PIN_LOCK = 8;      // output to transistor/relay (fail-safe)
const byte PIN_BTN  = 2;      // button to GND (internal pull-up)

void setup() {
  pinMode(PIN_LOCK, OUTPUT);
  digitalWrite(PIN_LOCK, HIGH);   // HIGH = powered -> locked
  pinMode(PIN_BTN, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(PIN_BTN) == LOW) { // button pressed
    digitalWrite(PIN_LOCK, LOW);     // cut power -> unlock (POWER OFF)
    delay(3000);                     // access time
    digitalWrite(PIN_LOCK, HIGH);    // power again -> lock
    delay(250);
  }
}

Package Contents

• 150A-NC electric bolt lock
• Coil protection diode
• Mounting screws and accessories
• Quick installation guide (EN)