# Low voltage disconnect relay module, 12V, adjustable

- Page: https://sigmanortec.ro/en/low-voltage-disconnect-relay-module-12v-adjustable
- Price: 9.90 RON
- Availability: In stock; 1-2 zile
- Reference: 9921 · EAN: 5945258972691
- Category: Mechatronics and IoT > Sensors and Modules > Voltage and Current Sensors
- Specifications: Voltage Adjustment: Yes; Output Type Voltage: Closed-Open Contact; Input Voltage: 12 VDC; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.
- Package (shipping data): 0.018 kg
- Updated: 2026-09-23
- 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

Protects 12V batteries by automatically disconnecting the consumer when the voltage drops below the set threshold, preventing deep discharge, restarts itself when the voltage returns to a safe level, finely adjustable threshold from the multi-turn potentiometer, low standby consumption below 10mA, clear status indication via LEDs, relay for DC loads up to 10A resistive, recommended 5A.
Undervoltage protection relay module, designed to turn off power to a resistive load when the voltage drops below a preset threshold, preventing deep battery discharge. Once the voltage returns to a safe level, the module automatically reactivates the load.
The undervoltage threshold is adjusted by a multi-turn potentiometer integrated on the board.
The power consumption is low (<10mA in standby) and the design is compact, making it ideal for protecting 12V batteries in various applications and locations.
Standby means the state of waiting for the protection to be triggered. Once the protection is triggered, the relay switches to disconnect the consumer and the current consumption increases.
The module also has two LEDs that indicate its operation and the low voltage condition when detected.
Specifications:
Input voltage: 12VDC
Standby current consumption: <10mA (voltage above minimum threshold)
Working current consumption: over 60mA (voltage below set threshold)
Maximum load: 12V DC, 10A (for resistive load), recommended up to 5A
Mounting dimensions: 34 mm (distance between holes), hole diameter 3 mm
Dimensions: 40 x 29 x 19 mm
Use:
Pay attention to the battery connections (+ and -) to avoid damaging the module. The polarities are marked directly on the back of the PCB.
The module has a relay that, when the voltage is above the minimum threshold, is in a rest state. When the voltage drops below the set threshold, the relay is energized and the consumption increases to 60mA. It is important to disconnect the consumer within a short time after the protection is triggered.
Power the module from the battery, it is not necessary to connect the consumer yet. Ideally, for its setting, it is recommended to use an adjustable source that will be set to the voltage at which you want to disconnect the load, which will then be transferred to the battery. Use the potentiometer to adjust the shutdown voltage - clockwise to increase the threshold and counterclockwise to decrease it.
If the load is reactivated immediately after shutdown, a capacitor can be added (>25V, value depends on the load consumption). This is possible because when the load is disconnected there will be an immediate increase in the battery voltage, which the module will detect.
Connect the consumer ensuring that the module is suitable for the type of load used (maximum 10A for resistive loads). A load close to the module limit will lead to premature damage.