BMT 2-Channel Relay Module 12V DC Optocoupler Isolated High Low Trigger

The BMT 2-Channel 12V Relay Module is a compact, reliable, and industrial-grade switching solution designed for safe and stable control of AC and DC loads. Featuring dual high-quality relays, SMD optocoupler isolation, and jumper-selectable high/low trigger modes, this module offers flexible integration with microcontrollers, PLCs, Arduino systems, and automation platforms.

Built for durability and performance, the module supports loads up to AC 250V / 10A and DC 30V / 10A, making it ideal for controlling motors, lighting, pumps, heaters, solenoids, and other electrical devices. The opto-isolated inputs provide strong noise immunity and electrical protection, ensuring stable operation even in electrically noisy environments.

Each relay channel can be independently configured for high-level or low-level triggering via onboard jumpers, allowing full compatibility with different logic systems. The fault-tolerant design ensures that if a control signal line is disconnected, the relay will not accidentally trigger, improving system safety.

Status indication is clear and user-friendly with power and relay state LEDs, while the screw terminal interface allows fast, secure, and reliable wiring for both control and load connections.

Key Features

• Dual Relay Output (2-Channel Control)
• 12V Operating Voltage
• High Load Capacity
  AC 250V / 10A
  DC 30V / 10A
• SMD Optocoupler Isolation
  Electrical noise protection
  Stable signal triggering
  Improved system safety
• Selectable Trigger Logic
  Independent High-Level / Low-Level trigger per channel via jumper
• Low Trigger Current
  Trigger current: 5mA
• Fault-Tolerant Design
  Relay remains OFF if control signal line is broken
• LED Indicators
  Green LED: Power
  Red LEDs: Relay status (per channel)
• User-Friendly Wiring
  Screw terminals for all connections
• Compact and Robust PCB Design
  Industrial-grade reliability

Technical Specifications

• Operating Voltage: 12V DC
• Relay Channels: 2
• Maximum Load:
  AC 250V / 10A
  DC 30V / 10A
• Trigger Current: 5mA
• Isolation: SMD Optocoupler
• Module Dimensions: 73 × 50 × 18.5 mm (L × W × H)
• Mounting Holes:
  4 × holes, Ø 3.1mm
  Spacing: 67 × 44.5mm

Interface Description

Power Input

• DC+ +12V power supply
• DC- Ground (0V)

Control Inputs

• IN1 Channel 1 trigger input (High/Low selectable)
• IN2 Channel 2 trigger input (High/Low selectable)

Relay Outputs

Channel 1

• NO1 Normally Open
• COM1 Common
• NC1 Normally Closed

Channel 2

• NO2 Normally Open
• COM2 Common
• NC2 Normally Closed

Typical Applications

• Arduino and MCU projects
• Home automation systems
• Industrial automation
• Robotics power control
• Smart switching systems
• Motor and pump control
• Lighting automation
• Power distribution systems
• Control panels
• Laboratory automation

What's in the box
1 x BMT 2-Channel 12V Relay Module High/Low Trigger with Opto Isolation