# Miniature solenoid valve, Air, NO, 0520C, 6V

> Miniature solenoid valve, model 0520C, rated for 6V, working medium air, contact type NO (Normally Open). Power consumption below 2W, compact body 13 x 15 x 20 mm, ports of 3.5 mm and 3.0 mm. Pressure range 0-350 mmHg, operating temperature 0-55 °C, noise below 60 dB. Requires an external switching element (transistor, MOSFET or relay) when driven from a microcontroller.

- Page: https://sigmanortec.ro/en/miniature-solenoid-valve-air-no-0520c-6v
- Price: 18.85 RON
- Availability: In stock; 1-2 zile
- Reference: 88264 · EAN: 5944649429073
- Category: Electronic components > Electrical valves and Debitmeters
- Specifications: Input Voltage: 6 V; Model: 0520C; Contact type: NO; Working medium: Aer
- Package (shipping data): 0.02 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 02:22 (Europe/Bucharest)

## Description

Ideal for precise control of air or gas in 6VDC projects, it operates Normally Open for free flow without power, and closes quickly when energized for secure blocking. It has power consumption below 2W, an ultra-compact 13 x 15 x 20 mm body for easy integration, 3.5 mm and 3.0 mm ports, good sealing, and low noise below 60 dB.
This miniature solenoid valve is designed for precise control of air and gas flow in 6VDC-powered applications. The valve operates in Normally Open (NO) mode, which means that in the absence of power the air passage is open, with no energy consumption. When the rated 6 VDC voltage is applied, the internal coil actuates the mechanism and closes the circuit, blocking airflow between the two ports with diameters of 3.5 mm and 3 mm.
When power is disconnected, the valve automatically returns to the open position. Power consumption is under 2 W, and its compact 13 x 15 x 20 mm body makes it suitable for integration into space-limited devices.
The supported pressure range is between 0 and 350 mmHg, with an exhaust speed of under 3 seconds for a 500 cc vessel from 300 mmHg to 15 mmHg and excellent sealing, with pressure drop under 5 mmHg per minute.
Operating noise is under 60 dB measured at 30 cm, and the accepted operating temperature is between 0 and 55 °C. The valve is compatible with any control system that can supply 6 VDC, including Arduino, ESP32, STM32 platforms or other microcontrollers, provided an external switching element is used.
Specifications:
Rated voltage: 6 VDC
Power: < 2 W
Operating mode: Normally Open (NO)
Pressure range: 0 - 350 mmHg
Exhaust speed: < 3 s (500 cc vessel, from 300 mmHg to 15 mmHg)
Sealing: pressure drop < 5 mmHg/min (500 cc vessel, from 300 mmHg)
Operating temperature: 0 - 55 °C
Noise: < 60 dB
Plastic port size: 3.5 mm
Metal port size: 3.0mm
Body dimensions: 13 x 15 x 20 mm
Usage:
Connect the valve's red wire to the positive terminal of the 6 VDC power supply and the black wire to ground (GND).
In the absence of power, the valve remains open and allows airflow.
When 6 VDC is applied, the valve closes and blocks airflow between the two ports.
When power is disconnected, the valve automatically returns to the open position.
Do not exceed the rated 6 VDC voltage; overvoltage may irreparably damage the coil.
For control from a microcontroller (Arduino, ESP32, STM32, etc.), do not connect the valve directly to a GPIO pin, because the current drawn by the coil exceeds the pin's maximum capacity.
Use an NPN transistor (e.g. 2N2222, BC547), relay, or a MOSFET (e.g. IRLZ44N) as a switching element between the control pin and the valve coil.
Install a flyback protection diode (e.g. 1N4007) in parallel with the valve coil, with the cathode toward the red wire (plus), to dissipate the reverse voltage generated when the coil is switched off and protect the control circuit.
Dimension diagram: