Name: Generic 1-Channel 30A Relay Module | 12V Optocoupler Isolation | High/Low Trigger Support
Brand: Generic
SKU: OL-GEN-1CHRELAY
Price: 149.00 INR
Availability: InStock

Robust 30A Switching

Effortlessly controls high-power devices, ensuring stable operation for demanding electrical projects.

Critical Opto-Isolation

Safeguards your microcontroller from harmful load surges, enhancing system longevity and safety.

Versatile Trigger Logic

Seamlessly integrates with both 3.3V and 5V systems, simplifying diverse project configurations.

The Engineering Behind 1-Channel 30A Relay Module

This 1-Channel 30A Relay Module is engineered for demanding power control applications, utilizing a high-current Songle SRD-12VDC-SL-C type relay controlled via a digital input. Its core architecture incorporates an optocoupler for galvanic isolation, ensuring critical separation between the low-voltage control circuit (microcontroller) and the high-voltage load circuit, thereby protecting sensitive electronics from inductive kickback and power surges.

Constructed with industrial-grade components and a robust PCB, this module is designed for long-term stability in harsh environments. The high current capacity makes it suitable for switching heavy loads like motors, heating elements, or lighting systems, providing a reliable and durable solution for both prototyping and permanent installations.

Optocoupler Isolation & Flexible Triggering

The integrated optocoupler provides crucial electrical isolation, preventing noise interference and potential damage from high voltage/current loads back to the control board. This design ensures maximum safety and operational stability. Furthermore, its versatile trigger input supports both high and low-level logic signals, making it compatible with a wide array of microcontrollers and control systems without requiring external logic level shifters.

High Current Capacity & Robust Terminals

Equipped with a 30A rated relay, this module can handle substantial electrical loads, far exceeding typical 10A relays. The screw terminal blocks for load connections are heavy-duty, providing secure and reliable contact for thick gauge wires, crucial for high-current applications to minimize resistance and prevent overheating. The control input also features clearly labeled pins for intuitive integration.

Optimized for Performance & Integration

Relay Type: 1-Channel SPDT (Single Pole Double Throw)
Coil Voltage: 12V DC
Max Load Current: 30A @ 250VAC / 30VDC
Isolation: Optocoupler (Galvanic)
Trigger Logic: High and Low Selectable
Indicator LEDs: Power, Status
Mounting: Standard PCB Mount Holes
Input Control Voltage: 3.3V to 5V (Logic)

Features & Benefits

30A High Current Capacity: Safely switches heavy loads like motors, heating elements, and high-power lighting systems.
Optocoupler Isolation: Protects sensitive control electronics from voltage spikes and noise from the load.
12V Coil Operation: Standard voltage for easy integration with common power supplies and systems.
High/Low Level Trigger: Offers flexible compatibility with diverse microcontrollers and control signals.
Secure Screw Terminals: Ensures robust and reliable connections for high-current wiring, minimizing resistance.
Status LED Indicators: Provides clear visual feedback on power and relay switching status for diagnostics.

Pro-Grade Advantages

High 30A switching capability for heavy-duty applications.
Galvanic optocoupler isolation protects control circuitry from load transients.
Flexible high/low level trigger input for broad microcontroller compatibility.
Robust screw terminals ensure secure, low-resistance connections for high currents.

Technical Considerations

Requires adequate heat dissipation in continuous high-current operation.
Larger physical footprint compared to lower amperage relay modules due to high rating.

What is the primary function of the optocoupler in this relay module?

The optocoupler provides galvanic isolation between the low-voltage control circuit and the high-voltage load circuit. This protects sensitive microcontroller components from electrical noise, voltage spikes, and back EMF generated by the load, ensuring system stability and longevity.

Can this 30A relay module be controlled by a 5V Arduino or Raspberry Pi?

Yes, this module is designed to support both high and low-level trigger signals. This means it is fully compatible with standard 5V microcontrollers like Arduino and 3.3V controllers like Raspberry Pi, allowing for versatile integration into various projects.

What are the typical applications for a 30A relay module?

A 30A relay module is ideal for switching high-power inductive or resistive loads such as AC motors, pumps, heating elements, industrial lighting systems, or large power supplies in automation and control systems where direct high current handling is required.

How do I select between high and low-level trigger modes?

Most modules feature a jumper cap or a small switch (often labeled ‘HL’ or ‘Trigger Mode’) to select between high and low-level trigger modes. A low-level trigger activates the relay when the input pin is connected to ground, while a high-level trigger activates it when connected to VCC (typically 3.3V or 5V).

What safety precautions should be taken when using this high-current relay?

When working with a 30A relay, it is crucial to use appropriately rated wires (gauge) for the load, ensure proper insulation, and never exceed the specified voltage and current ratings. Adequate ventilation should be provided, and all connections must be secure to prevent overheating and fire hazards.

Specification	Value
Number of Channels	1
Relay Coil Voltage	12V DC
Max Switching Voltage (AC)	250V AC
Max Switching Current (AC)	30A AC
Max Switching Voltage (DC)	30V DC
Max Switching Current (DC)	30A DC
Isolation Type	Optocoupler (Galvanic)
Trigger Logic	High and Low Selectable
Control Signal Voltage	3.3V – 5V
LED Indicators	Power, Relay Status
Screw Terminal Spacing	5.0mm (approx)
Mounting Holes	4 x M3