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

Product ID: 7893757

Details

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

⚡10A Current Rating

🔌12V Coil Voltage

🛠️PCB Mount Design

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Description

🔧 Power Your Projects with Precision!

ROBUST ISOLATION - Patch optical isolation ensures strong drive ability and stable performance.
FAULT TOLERANT DESIGN - Even if the control line fails, the relay remains inactive, ensuring safety.
COMPACT AND LIGHTWEIGHT - Weighing just 1.76 ounces, this module is perfect for space-constrained projects.
USER FRIENDLY INTERFACE - All interfaces connect directly via terminal wiring leads for hassle-free setup.
VERSATILE TRIGGERING OPTIONS - Easily switch between high and low level triggers with a simple jumper setting.

The HiLetgo 2pcs DC 12V 2 Channel Relay Module is a versatile and reliable component designed for various trigger applications. With features like high/low level triggering, robust optical isolation, and a user-friendly interface, this module is perfect for both hobbyists and professionals. Its compact design and fault-tolerant capabilities make it an essential addition to any electronic project.

Specifications

ASIN	B00LW15F42
Best Sellers Rank	#47,835 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #22 in Electromechanical Relays
Brand Name	HiLetgo
Coil Voltage	12 Volts
Connector Type	Screw
Contact Current Rating	10 Amps
Contact Material	Silver
Contact Type	Normally Open
Current Rating	10 Amps
Customer Reviews	4.5 4.5 out of 5 stars (511)
Item Weight	1.76 ounces
Manufacturer	HiLetgo
Maximum Switching Current	10 Amps
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	2.0 Count
Wattage	50 watts

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