So on "low" the relay triggers when the signal voltage falls below 12v? and "hi" when the signal rises above 12v? can you tune the trigger voltage?thx

If you set it to "High" then the relay trips when there is + 12V on INT1 or INT 2. (+12 as in the positive side of the power source) If you set to low, it will trip when their is -12v (technically 0 volts) on INT 1 or INT2 (-12 as in the negative side of the power source)

These are locking in the triggered position (Red light on), even with no trigger voltage. Any ideas, did I get bad ones?

When you say no trigger voltage, do you mean that no wires connected? If so then you may have gotten a bad set. Otherwise, check the jumper pins next to the trigger input. See if it set to low.

What is the minimum to maximum voltage for both the low and high?

Minimum voltage that will trigger high: 2.5V Maximum voltage that will trigger low: (Vsupply- 2.5V) Measured this with Vsupply values of 12.2V and 13.6V. Used UNI-T UT61E multimeter for voltage measurements.

are these latching relays?

No. They have normally open and normally closed contact points and will flip to the normally closed position when the trigger stops.

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HiLetgo 2pcs DC 12V 2 Channel Relay Module with Isolated Optocoupler High and Low Level H/L Level Trigger Module Triggered by DC 12V

HiLetgo 2pcs DC 12V 2 Channel Relay Module with Isolated Optocoupler High and Low Level H/L Level Trigger Module Triggered by DC 12V

Product ID: 7893757

Details

Connector Type
Screw
Contact Material
Silver
Contact Type
Normally Open
Current Rating
10 A
Mounting Type
PCB Mount

⚡12V DC coil voltage

🔌10A max switching current

🛡️Optocoupler isolation for stable drive

€ 20.13

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Description

⚡ Power your projects with precision and reliability—don’t get left in the dark!

ROBUST ISOLATION - Optocoupler design ensures noise-free, stable relay activation every time.
HEAVY DUTY SWITCHING - Handles up to 250V AC / 10A load—built for demanding industrial tasks.
FLEXIBLE TRIGGER MODES - Set high or low level triggers via jumper for ultimate compatibility.
USER FRIENDLY INTERFACE - Direct terminal wiring and mounting holes for quick, hassle-free installation.
DUAL CHANNEL POWER CONTROL - Manage two independent circuits with precision and ease.

The HiLetgo 2pcs DC 12V 2 Channel Relay Module features isolated optocouplers for stable, noise-free switching, supports both high and low level triggers, and can handle up to 10A at 250V AC or 30V DC loads. Designed for easy installation with direct terminal connections and mounting holes, this module is ideal for professional-grade control applications requiring reliable, dual-channel relay management.

Specifications

ASIN	B00LW15F42
Best Sellers Rank	#92,163 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #70 in Electromechanical Relays
Brand Name	HiLetgo
Coil Voltage	12 volts
Connector Type	Screw
Contact Current Rating	10 A
Contact Material	Silver
Contact Type	Normally Open
Current Rating	10 A
Customer Reviews	4.5 4.5 out of 5 stars (512)
Item Weight	1.76 ounces
Manufacturer	HiLetgo
Maximum Switching Current	10 A
Maximum Switching Voltage	250 volts
Model	3-01-0342
Mounting Type	PCB Mount
Operation Mode	Manual
Part Number	3-01-0342
UPC	702082655962
Unit Count	2 Count
Wattage	50 watts

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