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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Description

⚙️ Power Up Your Control Game!

DURABLE DESIGN - Moisture-proof and anti-corrosion for long-lasting performance.
EFFORTLESS INSTALLATION - Compact size (58 x 45 x 32mm) fits seamlessly into any setup.
VERSATILE VOLTAGE RANGE - Operates from 3-32VDC input to 24-480VAC output.
WHISPER QUIET OPERATION - No noise or sparks, perfect for sensitive environments.
UNMATCHED POWER HANDLING - Handles up to 40A for robust applications.

The CGELE CG Solid State Relay SSR-40DA is a high-performance relay designed for seamless DC to AC conversion, supporting a wide voltage range and high current capacity. With features like thermal grease for efficient heat dissipation and a compact design, it's perfect for automatic process control applications, ensuring reliability and longevity in various machinery control systems.

Specifications

Connector Type	Screw
Contact Material	Silver Alloy Or Copper Alloy
Contact Type	Normally Open
Current Rating	40 Amps
Mounting Type	DIN Rail Mount
Brand	CGELE
Operation Mode	Automatic
Coil Voltage	3 Volts (DC)
Contact Current Rating	40 Amps
Maximum Switching Current	40 Amps
Number of Terminals	3
Specification Met	Electromagnetic Compatibility
UPC	774297736439
Manufacturer	CGELE
Item Weight	3.52 ounces
Package Dimensions	3.27 x 3.11 x 2.2 inches
Item model number	DC to AC 40A
Size	DC to AC 40A
Material	epoxy
Measurement System	Metric
Batteries Included?	No
Batteries Required?	No

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