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Description
SSR-40AA AC to AC Solid State Relay - 2 PackSSR 40AA Solid State Relay Key Features Model: SSR 40AA Type: Single Phase AC to AC Solid State Relay Load Current: 40A Input Voltage Range: 70 280V AC Output Voltage Range: 24 480V AC Switching Method: Zero Crossing Features a built in LED status indicator Designed with a metal base plate for thermal management Replaces Cross Reference Part Numbers SSR 40AA SSR 40AA Compatibility & Fitment General purpose component for applications requiring AC load
SSR-40AA Solid State Relay
Key Features
- Model: SSR-40AA
- Type: Single Phase AC-to-AC Solid State Relay
- Load Current: 40A
- Input Voltage Range: 70-280V AC
- Output Voltage Range: 24-480V AC
- Switching Method: Zero-Crossing
- Features a built-in LED status indicator
- Designed with a metal base plate for thermal management
Replaces / Cross-Reference Part Numbers
- SSR-40AA
- SSR 40AA
Compatibility & Fitment
- General-purpose component for applications requiring AC load switching.
- Commonly used in temperature control systems (PID), industrial automation, heating elements, lighting controls, and other machinery.
- Designed for use with resistive loads.
- Ensure your application's voltage and current requirements fall within this relay's specified operating range.
When to Replace
- The connected load does not turn on when control voltage is applied.
- The connected load remains on permanently, even with no control voltage.
- Operation is intermittent or unreliable.
- Visible signs of overheating, charring, or physical damage to the relay casing.
Installation Tips
- A heat sink is required for loads exceeding 10A to prevent overheating.
- Apply a thin layer of thermal compound between the relay's metal base and the heat sink for optimal heat transfer.
- Ensure all terminal connections are secure to prevent arcing.
- Use appropriately sized wiring to handle the intended load current.
- Verify correct wiring for input (control) and output (load) terminals before applying power.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
Snagged a deal
Size: 7, Color: Redwood/Gum 10
I waited and waited to get these boots! I knew I was chancing it, but they went on sale, and I snagged them! I am a size 7, and they fit nicely with socks. a little loose, barefooted, but what psycho wears boots without socks? They are comfortable and really well-made.
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Reviewed in the United States on April 8, 2026
★★★★★ 4
Cute, comfortable waterproof boots (a little snug to put on)
Size: 7, Color: Velvet Tan/Gum 2
These are really cute Chelsea-style boots and feel very comfortable once they’re on. The waterproof material is great for wet weather and the sole feels sturdy with good traction. They look stylish enough to wear casually but still feel practical for rainy days.
The only downside is they can be a little difficult to put on at first because the opening is somewhat snug, but once they’re on they fit well and feel supportive. Overall they’re a great waterproof boot and I’ve enjoyed wearing them.
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Reviewed in the United States on March 17, 2026
★★★★★ 5
Surprisingly great for my wide feet and high instep!
Size: 10.5, Color: Velvet Tan/Gum 2
So thrilled I took a chance on these. Finding boots is impossible for me. I have wide feet, a super high instep, a bunion on one foot, and I wear a hard to find size (10.5). I ordered the 10.5 and 11 in these expecting I might need to size up for width (if I could even get them on). It was a struggle getting the 10.5s on the first time, and once I did they were somewhat uncomfortable on the top of my left foot. But I read that they would relax so decided to give it a go because I need waterproof boots for an upcoming trip and the 11s felt too long. After two days of light wear, they are already breaking in and I have no more discomfort. Getting them on is already easier and they are plenty wide enough and very comfortable to walk in. These are true to size. Super happy and worth a day of mild discomfort to break them in!
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Reviewed in the United States on March 7, 2026
★★★★★ 5
Comfortable, sturdy, waterproof
Size: 9.5, Color: Black/Black
Loce, love, love these boots. Have walked ten miles with no foot pain around NYC. They go with everything and and are so comfortable. As they are waterproof/resistant, they get a little warm in high temps, but perfect three-season boots.
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Super cute, comfortable, practical, love that they are slip on
Size: 10.5, Color: Tobacco/Black
I have worn these 2-3 times already. The first day was a school/work day so I was on my feet 9 hours and the only issue I had was with the side of the boot rubbing against my ankle. I just make sure I wear socks high enough to cover my ankles or jeans that go into the boots now for long wear days.
Absolutely love them! They keep my feet dry in this snow( we live in Michigan). I had been looking for a pair like this for awhile now and was getting super frustrated that I couldn't find my size in any that I liked. I saw that they had these available in a 10.5 and I wear 11. I looked at the Sorel website reviews (since the amazon ones weren't super helpful on sizing) and they said that the boots ran big so I took a chance on the 10.5 fitting me. They fit perfect. I have long narrow feet but I could see where they would be tight or uncomfortable on someone with wider feet. I've been trying to find a pair for my mom now since she has boot envy.
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Reviewed in the United States on January 27, 2026