# Protection Module

> Electronic protection modules: overvoltage, reverse polarity, overcurrent, speaker protection and optocouplers.

- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Category page: https://sigmanortec.ro/en/protection-module
- Category: Electronic components > Protection Module
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:32 (Europe/Bucharest)

## Products (9)

### RC absorption module, overvoltage protection, 5-400V, AC-DC
- Page: https://sigmanortec.ro/en/rc-absorption-module-overvoltage-protection-5-400v-ac-dc
- Details: https://sigmanortec.ro/en/llms/p/2310.md
- Price: 7.80 RON
- Availability: In stock; 1-2 zile
- Reference: 88196 · EAN: 5949680965108
- Specifications: Input Voltage: 5 - 400 V

RC absorption module for overvoltage protection, operating voltage 5-400V AC/DC. It combines an RC network with a varistor to limit voltage spikes and reduce interference when switching inductive loads (relays, solenoids, motors). It is mounted in parallel with the load, on terminals or PCB. Dimensions: 30.5 x 14 mm.

### Reverse polarity protection module, MOSFET, 3–28V, 12A
- Page: https://sigmanortec.ro/en/reverse-polarity-protection-module-mosfet-328v-12a
- Details: https://sigmanortec.ro/en/llms/p/2424.md
- Price: 10.25 RON
- Availability: In stock; 1-2 zile
- Reference: 88230 · EAN: 5942239367330
- Specifications: Supply Voltage: 3; Maximum Input Voltage: 28; Maximum Output Current: 12; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.; Switching technology: MOSFET

MOSFET-based reverse polarity protection module, part number 88230. Operates between 3 and 28 VDC, supports continuous current up to 12A (peak 15A), with a voltage drop below 50 mV and MOSFET internal resistance below 5 mΩ. Response time under 1 μs. Dimensions 12x22 mm. Pins: B+/B- input, V+/V- protected output. Suitable for batteries, DC power supplies, solar panels and development boards.

### Motor Overload Protection Module, 6-28V, 5A, PWM DC
- Page: https://sigmanortec.ro/en/motor-overload-protection-module-6-28v-5a-pwm-dc
- Details: https://sigmanortec.ro/en/llms/p/2152.md
- Price: 60.88 RON
- Availability: In stock; 1-2 zile
- Reference: 9980 · EAN: 5945783425228
- Specifications: Maximum Input Voltage: 28; Maximum Output Current: 5; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

GZ03 protection module for DC motors and circuits powered at 6-28V DC, with maximum output current of 5A for inductive loads (8A for resistive loads). Protects against overcurrent, short circuit and motor stall, compatible with PWM control. Adjustable current limit 0.2-10A, trip delay 0-20s, automatic reset 1-600s or manual via jumper. LEDs for power and alarm status.

### Audio speaker protection module, power-on delay, 12-18VAC, 300W
- Page: https://sigmanortec.ro/en/audio-speaker-protection-module-power-on-delay-12-18vac-300w
- Details: https://sigmanortec.ro/en/llms/p/2109.md
- Price: 71.63 RON
- Availability: In stock; 1-2 zile
- Reference: 9941 · EAN: 5945332836758
- Specifications: Power: Over 20W; Maximum Controlled Power: 300 W; Input Voltage: 12-18VAC; Input Voltage Type: AC

Speaker protection module (ref. 9941), model UPC1237, with power-on delay of about 3 seconds and DC detection at about 1V. Operates at 12-18VAC, requires a separate power supply, supports 2 channels x 300W, uses dual Omron relays in parallel connection. LED indicates operating status. Not compatible with BTL circuits.

### Speaker protection module, delayed start, 12-15VAC, stereo
- Page: https://sigmanortec.ro/en/speaker-protection-module-delayed-start-12-15vac-stereo
- Details: https://sigmanortec.ro/en/llms/p/2110.md
- Price: 26.63 RON
- Availability: Out of stock
- Reference: 9942 · EAN: 5946597873687
- Specifications: Input Voltage: 12-15VAC; Input Voltage Type: AC

Stereo speaker protection module with delayed start (~3 seconds) and decoupling upon detection of DC voltage (~1V). Uses a 15A relay, two channels (R and L), status LED. Requires independent 12-15VAC power supply, cannot share power with other circuits. Dimensions 65x40mm. For BTL circuits, two modules per channel are required. Reference 9942.

### Diode Module Sense, Anti-Reverse, 75V, 12A
- Page: https://sigmanortec.ro/en/diode-module-sense-anti-reverse-75v-12a
- Details: https://sigmanortec.ro/en/llms/p/1972.md
- Price: 69.03 RON
- Availability: In stock; 1-2 zile
- Reference: 9792 · EAN: 5945809300621
- Specifications: Nominal Current: 12 A; Maximum Input Voltage: 75; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

Diode module with anti-reverse protection, 75V, 12A (ref. 9792), for solar systems between an MPPT controller and battery, preventing reverse charging and backflow current. Input voltage 9-75V DC, internal resistance 4 mOhm, peak current 20A, continuous current under 12A, operating temperature -20 to 100 degrees C. No reverse-polarity protection. PCB labels: VIN+, OUT+, GND.

### Battery voltage protection module, under-voltage, over-voltage, with display, 6-40VDC
- Page: https://sigmanortec.ro/en/battery-voltage-protection-module-under-voltage-over-voltage-with-display-6-40vdc
- Details: https://sigmanortec.ro/en/llms/p/1744.md
- Price: 28.29 RON
- Availability: In stock; 1-2 zile
- Reference: 9635 · EAN: 5946739248809
- Specifications: Maximum Input Voltage: 40; Output Type Voltage: Closed-Open Contact; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

Provides undervoltage and overvoltage protection for batteries, automatically stopping charging or discharging at set thresholds. The integrated display indicates the voltage in real time, you can adjust the limits and timing up to 999 minutes. Includes relay for load control and HIGH signal output for external relay, plus RX TX pins for serial monitoring. Compatible 1-60VDC, 6-40VDC power supply.
Charge and discharge control and protection module compatible with a wide range of batteries (between 1 and 60VDC). The board has a display that indicates the battery voltage in real time.
You can set the charge and discharge voltage limit as well as the maximum charge/discharge time.

### Overcurrent protection module, 5A, adjustable, with relay, 12VDC
- Page: https://sigmanortec.ro/en/overcurrent-protection-module-5a-adjustable-with-relay-12vdc
- Details: https://sigmanortec.ro/en/llms/p/1715.md
- Price: 18.05 RON
- Availability: Out of stock
- Reference: 9606 · EAN: 5940848739029
- Specifications: Current Adjustment: Yes; Maximum Output Current: 5; 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.

Overcurrent protection module for AC circuits, with automatic disconnection via a 220VAC 10A relay when the current exceeds the adjustable threshold of up to 5A. Powered at 12VDC, current consumption 

### TLP281 optocoupler module, 4 channels
- Page: https://sigmanortec.ro/en/tlp281-optocoupler-module-4-channels
- Details: https://sigmanortec.ro/en/llms/p/975.md
- Price: 9.11 RON
- Availability: In stock; 1-2 zile
- Reference: 9164 · EAN: 5947155375377

4-channel optocoupler module based on TLP281 (Toshiba), providing galvanic isolation between INPUT and OUTPUT. INPUT voltage 3V/5V, maximum HVCC voltage 24VDC, maximum current draw 500mAh, output current equal to HVCC/5.1K. Compatible with Arduino and other development boards, suitable for safely controlling motors, relays or servomotors. Dimensions 25 x 24mm, weight 5g.