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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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: 256334306

Details

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

⚡12V Power

🔌2 Channels

🛡️Optical Isolation

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Description

🔧 Power Your Projects with Precision!

ROBUST PERFORMANCE - Experience strong drive capability and stable operation for all your automation needs.
COMPACT EFFICIENT - Designed to fit seamlessly into your projects without taking up unnecessary space.
USER FRIENDLY DESIGN - Connect effortlessly with terminal wiring leads for a hassle-free setup.
VERSATILE TRIGGERING - Easily switch between high and low level triggers with a simple jumper setting.
FAULT TOLERANT ENGINEERING - Rest easy knowing that a broken control line won't compromise your relay's operation.

The HiLetgo 2pcs DC 12V 2 Channel Relay Module is a versatile and reliable solution for various automation applications. Featuring isolated optocouplers, it allows for high or low level triggering, ensuring strong drive capability and stable performance. Its user-friendly design and fault-tolerant features make it an essential tool for professionals looking to enhance their projects.

Specifications

ASIN	B00LW15F42
Best Sellers Rank	#57,126 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #29 in Electromechanical Relays
Brand	HiLetgo
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 out of 5 stars 512 Reviews
Item Weight	0.11 Pounds
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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