Is this a zero-crossing relay?

The short answer is NO..... However I think a more detailed explanation is required. A "Zero Crossing" circuit is more an AC control method rather than this: it is a DC input to AC output device... meaning any DC voltage greater than 3VDC is considered on "On" signal and this On signal turns on a AC load (24-480VAC). ... SO a small DC input signal turns on the larger AC load. Make sense?

Is there a difference between using 5V vs 30V for control current? Does it affect performace of solid state switch?

This product can control whether the alternating current appliance(s) connected to it are energized or not with anywhere from 3 - 32 Volts of Direct Current. Any direct current voltage within this range is adequate enough to flip the switch within the device that closes the alternating current side of the switch. An appliance on the alternating current side of the switch works no better or worse depending upon the voltage on the direct current side of this switch the energizes the switch (not the appliance)--provided it is from 2 -32V--anymore than a window air conditioner works better or worse if a young weak child, or a bodybuilder turns its switch on.

The output spec is 24-480Vac. Will it work for 20Vac load voltage?

No you need at least 24V to a max of 480V or anywhere in between

Can it be used to power on a thermostate (c wire) that is 24vac (0.5 amp) from 12v dc?

Dear Customer:Yes. the input is 3-32VDC. and output side is 24-480VAC. you should connect power seperately.

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CG Solid State Relay SSR-40DA DC to AC Input 3-32VDC To Output 24-480VAC 40A Single Phase Plastic Cover

Product ID: 572293196

Details

Connector type
Screw
Contact material
Silver Alloy
Contact type
Normally Open
Current rating
40 Amps
Mounting type
DIN Rail Mount

⚡40A high current capacity

🔄3-32V DC input to 24-480V AC output

🛡️2500V optical isolation for safety

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Description

⚙️ Upgrade your control game with silent, reliable power switching!

BUILT TO ENDURE - Flame-retardant, moisture-proof, and vibration-resistant design
PLUG PLAY AUTOMATION - Easy screw terminal mounting with LED status indicator
POWERHOUSE PERFORMANCE - Handles up to 40A for heavy-duty industrial control
SEAMLESS VOLTAGE CONVERSION - Effortlessly converts low DC input to high AC output
SILENT SPARK FREE SWITCHING - Zero voltage switching eliminates noise and wear

The CG Solid State Relay SSR-40DA is a robust single-phase relay designed for industrial automation, converting 3-32V DC input signals into 24-480V AC output with a 40A current rating. Featuring zero voltage switching, optical isolation up to 2500V, and a durable flame-retardant plastic housing, it ensures silent, spark-free operation and long-term reliability in harsh environments. Ideal for temperature controllers, machinery control systems, and frequent switching applications.

Specifications

ASIN	B08GPB7N2T
Brand Name	CGELE
Coil Voltage	3 Volts (DC)
Connector Type	Screw
Contact Current Rating	40 Amps
Contact Material	Silver Alloy Or Copper Alloy
Contact Type	Normally Open
Current Rating	40 Amps
Customer Reviews	4.6 4.6 out of 5 stars (432)
Manufacturer	CGELE
Maximum Switching Current	40 Amps
Minimum Switching Voltage	3 Volts (DC)
Model	DC to AC 40A
Mounting Type	DIN Rail Mount
Number of Terminals	3
Operation Mode	Automatic
Specification Met	Electromagnetic Compatibility
UPC	774297736439
Unit Count	1.0 Count

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