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Overview Video

Solid state relay SSR-25DA, 25A 3-32V DC to AC

5 out of 5 based on 3 reviews | Write a review

$53.65

Low price SSR-25DA, single phase solid state relay, DC control, 3-32V DC input voltage, 25A load current, 24-480V AC load voltage, quality and reliable, best for commercial and industrial applications.

SKU: ATO-SSR-DH25DA

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Delivery date: 6-12 days

Features

25A solid state relay (SSR), 3-32V DC input and 24-480V AC output, features compact size, high structural strength, good impact resistance, and strong shock resistance. The SSR offers a reliable switching the commercial and industrial loads, such as computer peripheral interface device, printing machine, molding machine, food machine, packaging machine, and so on.

Built in RC absorption
Photoelectric isolation
SCR output
LED indicator for operation status
Removable protective cover for safety
Panel mount
Zero-crossing switch type

Specification

Model		ATO-SSR-DH25DA
Input	Control voltage range	3-32V DC
	Max. input current	12mA
	Must operate voltage	2.8V DC
	Must release voltage	1.5V DC
Output	Load voltage range	24-480V AC
	Peak voltage	800V AC
	Maximum load current	25A
	Maximum off-state leakage current	2mA
	Maximum off-state time	10mS
	Maximum on-state voltage drop	1.5V
General	Type	DC to AC, single phase
	Dimension L – W – H (mm)	57.4х44.8х28
	Weight	100g
	Dielectric strength (input to output)	4000V
	Dielectric strength (input, output to the base)	2500V
	Operating temperature	-20℃~ 80℃
	Mount	Panel
	Certification	CE

Note:

When the load is a resistive load, the maximum load current of the selected SSR should be 2~3 times greater than the actual load current;
When the load is an inductive load, the maximum load current of the selected SSR should be more than 7~8 times the actual load current.
When the maximum load current is higher than 10A, a heat sink must be installed to the solid state relay, or the SSR relay should be mounted on a metal base plate with heat dissipation effect, and the thermal grease is applied between them.

Dimension (Unit: mm)

Wiring Diagram

Tips: How to protect solid state relay (SSR)?

Overcurrent protection
SSR is a semiconductor power device that is extremely sensitive to temperature changes. Overcurrent may cause damages to it. Therefore, a fast acting fuse is usually used. But it is necessary to understand its protection features, to know the relationship between fuse current and time, and to correctly choose the fast acting fuse compatible with nominal current of SSR.
RC absorption circuit
RC absorption circuit. The use of RC circuit not only prevents over-voltage, but also improves dv/dt. The recommended R is 20-100Ω, the power 2-5W, C 0.1-0.47uf, and the withstand voltage is 250-630V. If SSR has lower nominal current, R adopts its upper limit 100Ω and C adopts its lower limit 0.1uf. Otherwise, R adopts its lower limit and adopts its upper limit.
Overheat protection
Overheated SSRs' characteristics may compromise, ranging from the loss of control to permanent damage. It is recommended to install a temperature control switch near the SSR baseplate with temperature control point at 75 to 80 ℃.
Series inductance L in inductor load
In the inductive load, SSR is usually damaged due to high rate of current di/dt. The inductance value of L depends on the size and cost level.

Solid state relay (SSR) is simple but widely used in the automation fields. Thus, it is not complex to wire a solid state relay. In this vedio, ATO takes a 40 Amp SSR (DC - AC) for example to show the wiring of a SSR and then switch on/off a motor with this SSR.

How to Test a Solid State Relay?

Solid state relays are commonly used to control many electronic components, so if a component isn't working because there's no current flowing through it, it's likely a problem with the relay. With some simple troubleshooting steps, it's easy to check if an SSR is working as expected. In this video, we'll show you step-by-step instructions on how to test a solid state relay.

Types of Solid State Relays

There are different types of solid state relays according to various classification standards. In this video, we will introduce a series of different types of SSRs according to the following standards.

DC-AC/AC-AC Single Phase Solid State Relays

In this video we take a quick look at ATO's current single phase SSR models along with their specifications and key features. They are designed to operate high load currents using low control currents, using our advanced opto-isolation technology.

Electromagnetic Switches: Relays VS. Contactors

In this video we will try to clear the confusion many people have between relays and contactors by showing you how to tell the difference based on five criteria: Definition, Capacity, Structure, Contacts and Applications.

Relays vs Circuit Breakers: What’s the Difference

In this video, we've described the difference between a relay and a circuit breaker as well as explaining their basic working and operation by means of animation. If you find this video helpful, please LIKE it and SHARE with your friends. Don't forget to check out the purchase links above if any featured items're of your interest.

Existing reviews of Solid state relay SSR-25DA, 25A 3-32V DC to AC

Control line-level baseboard heater

I've been using this 25A solid state relay as part of a circuit to control some line-level baseboard heaters. No problems so far. Be sure to install the appropriate heat sink and use thermal paste.

From: Barrel | Date: 10/11/2022

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Solid state relay ssr 25da vs. ssr 25aa

What is the difference between the ssr 25da and the ssr 25aa?

From: Dixon | Date: 25/07/2019

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ATO Responded

The solid state relay SSR-25DA is for direct current and SSR-25AA is for alternating current. For more details about SSR-25AA, please check this link: https://www.ato.com/solid-state-relay-ssr-25aa-25a-70-280v-ac-to-ac.

This is a great solid state relay.

This is a great solid state relay. I used it for electric heater and works as expected. It would be much better if it could come with a heatsink. Good unit.

From: Jason | Date: 25/01/2019

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