# Audio speaker protection module, power-on delay, 12-18VAC, 300W

> 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.

- Page: https://sigmanortec.ro/en/audio-speaker-protection-module-power-on-delay-12-18vac-300w
- Price: 71.63 RON
- Availability: In stock; 1-2 zile
- Reference: 9941 · EAN: 5945332836758
- Category: Electronic components > Protection Module
- Specifications: Power: Over 20W; Maximum Controlled Power: 300 W; Input Voltage: 12-18VAC; Input Voltage Type: AC
- Package (shipping data): 0.073 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

Speaker protection board with a power-on delay of about 3 seconds and DC detection at about 1V, protects the speakers at power-on and in case of a fault on the amplifier output. Operates at 12-18VAC with separate power supply, supports 2 channels up to 300W each, uses dual Omron relays for safe switching, LED indicates operating status.
Audio speaker protection board, essential for protecting your audio system against inrush currents and DC faults. With reliable functionality and a simple design, this module integrates a power-on delay of approximately 3 seconds and DC protection at a threshold of approximately 1V.
It is equipped with dual Omron relays, being compatible with most audio amplifiers in the voltage range of 12-18VAC. The LED indicator lights up during normal operation and goes out when the protection comes into action. The power supply requires a voltage of 12-18V AC and a SEPARATE POWER CIRCUIT , OTHERWISE IT WILL BE DAMAGED.
The power-on delay is approximately 3 seconds and it supports 2 channels, each capable of up to 300W, for which the input and output connections are present, with screw fixings directly on the board.
Do not use with a circuit with two active signals, BTL (Bridge-Tied Load) type, which increases the output power, without using a higher voltage source, through which a signal is applied to both ends of the speaker using the potential difference between the two signals.
Specifications:
Supply voltage: 12-18V AC ( independent power supply )
Maximum power supported: 300W x 2
Model: UPC1237
Protection type: Start-up delay and DC protection
Relays used: Dual Omron relays, parallel connection
Compatibility: Most audio amplifiers ( not compatible with BTL circuits )
Use:
Connect the board to a 12-18V AC power source, using an independent power supply circuit. DO NOT USE THE SAME POWER SUPPLY AS THE AMPLIFIER!
Make sure the connections are correct for optimal operation. DO NOT USE IN BTL CIRCUITS!
Indicator LED Lights up during normal operation and goes out if protection is activated.