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.

Cg Solid State Relay Ssr 40da Dc To Ac Input

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R$190

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Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Elevate your control game with silent, powerful switching!

BUILT TO LAST - Anti-corrosion, moisture-proof, and vibration-resistant for reliable long-term operation
SILENT SWITCHING - No sparks or noise thanks to solid-state design—perfect for noise-sensitive environments
COOL UNDER PRESSURE - Includes thermal grease to maximize heat dissipation and extend relay lifespan
POWERHOUSE PERFORMANCE - Handles up to 40A for heavy-duty industrial and home automation needs
PLUG PLAY COMPATIBILITY - Supports 3-32V DC input and outputs 24-480V AC, fitting a wide range of control systems

The CG Solid State Relay SSR-40DA is a robust, single-phase relay designed for seamless DC to AC switching with a 40A current rating. Featuring a compact design with included thermal grease for enhanced heat management, it ensures silent, spark-free operation ideal for industrial automation and temperature control systems. Built with durable materials and electromagnetic compatibility, it guarantees long-lasting, reliable performance in demanding environments.

Specifications

ASIN	B08GPB7N2T
Best Sellers Rank	#12,193 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Solid State Relays
Brand	CGELE
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 out of 5 stars 137 Reviews
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

Reviews

M**S

22.04.2026

R**.

4.02.2026

E**.

26.12.2025

P**N

25.11.2023

C**S

24.04.2026

K**Y

22.10.2025

H**S

30.09.2025

A**R

13.02.2026

B**Y

16.03.2026

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R$190

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Brazil.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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