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Blue Sea Systems Terminal Blocks 20A - 65A

4.8 4.8 out of 5 stars 928 ratings
Price: $6.98 $10.68 Free Return on some sizes and colors
2 Circuits

Current Rating 20 Amps
Connector Type Screw
Mounting Type Surface Mount
Material Synthetic
Brand Blue Sea Systems
Voltage 300 Volts
Number of Positions 2

About this item

  • 2 Circuit 20 Amp AC/DC 300V AC/DC Terminal Block
  • Closed back design completely insulates power from the mounting surface
  • Each screw pair is one isolated circuit
  • Jumpers allow creation of common circuits (sold separately)
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From the manufacturer

About Us

Blue Sea Systems designs and manufactures AC and DC electrical products engineered to withstand the demanding applications in Marine and Specialized Vehicle electrical systems.

Over 1,000 electrical products are designed to work together as a fully integrated system.

QUALITY Product quality is managed in a manner consistent with international standards.

Product Description

Closed back design completely insulates power from the mounting surface Each screw pair is one isolated circuit Jumpers allow creation of common circuits.

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Customer reviews

4.8 out of 5 stars
4.8 out of 5
928 global ratings

Customers say

Customers like the quality, ease of use, and value of the terminal block. They mention that it's well built, works great for prototyping heavy duty electrical stuff, and is easy to install and use. That said, opinions are mixed on fit.

AI-generated from the text of customer reviews

78 customers mention74 positive4 negative

Customers are satisfied with the quality of the terminal block. They mention that it's well-built, sturdy, and works great for prototyping heavy duty electrical stuff. The block is made from better-than-most plastic that doesn't split or crack when fastening it down. Some say that it did the job as intended and is great for simple electrical jobs that you may not want a permanent.

"...This terminal block is made from a better-than-most plastic that doesn't split or crack when fastening it down...." Read more

"...and the connections run the amperage through in a safe and good looking manor. I'll be ordering a few more for extras." Read more

"Perfect!" Read more

"...Cost was more than fair for most other options and quality was better than some higher priced alternatives as well. Cannot complain." Read more

9 customers mention9 positive0 negative

Customers find the terminal block easy to install and use. They say it mounts easily, attaches to each panel, and makes building relay pods easy. Customers also say it's easy to screw and unscrew ports.

"...No biggie. Good price none the less ad was easy to work with." Read more

"Just as advertised, easy to secure, great for adding accessories to your vehicle (like emergency lighting or flood lights)...." Read more

"...They are easily attached to each panel and I use them to route wires in series to other panels to make an array...." Read more

"Pretty straightforward, but well made." Read more

7 customers mention7 positive0 negative

Customers appreciate the value of the terminal block. They say it has a good price.

"...Cost was more than fair for most other options and quality was better than some higher priced alternatives as well. Cannot complain." Read more

"...It didn't say that it did but I guess I just expected it. No biggie. Good price none the less ad was easy to work with." Read more

"Worked perfect for me, and are way cheaper than the same block i can buy from the local NAPA store...." Read more

"...Zero issues, cheaper than similar at HD." Read more

4 customers mention4 positive0 negative

Customers find the terminal block versatile and useful for various applications. They say it's a nice junction for powered items and perfect for a power distribution block.

"This product makes ground connections easy! Can be used for various applications." Read more

"Very useful to charge multiple electronics. Keeps things nice & tidy." Read more

"Excellent quality. Perfect for a power distribution block." Read more

"Nice junction for powered items...." Read more

20 customers mention6 positive14 negative

Customers are mixed about the fit of the terminal block. Some mention that it's the perfect size and fits great in their factory stereo mounting holes. However, others say that it is too small for 14-16 gauge ring connectors and is approximately half the stated size.

"Nothing wrong with the terminal block, but smaller than I thought. I use 14 gauge wire with heat shrink ring terminals everywhere in my boat...." Read more

"...This terminal block is actually really small! After I received it, I had gone back to amazon to look at others listed...." Read more

"...block that could handle the job in a tight place and this was the perfect size...." Read more

"This terminal block is good quality but the slots are too small for 14-16 gauge ring connectors. Smaller 18-22 gauge connectors might fit...." Read more

Built well, but too tight.
4 Stars
Built well, but too tight.
Built like a tank, but I had to use 6 AWG terminals with a larger screw hole than is correct for the size screw in the terminal block or else the ring terminal would not sit flush. It seems like the terminal isolators are either too close, or this is only meant for spade terminals. I'm using MIL-SPEC terminals left over from a mod on one of the aircraft I work on, so I know my terminals aren't defective. If you find terminals that fit it, then it's a beast. It's not convenient to add a second conductor to each side since space is already so limited, so I'd suggest only using this as a feeder terminal strip for other bus bars. It CAN be done, but be sure your ring terminals have full contact so you don't add a high resistance to your system. If there was just a little more room, and I mean by a few thousandths of an inch this would be a 5 star product.
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Top reviews from the United States

AlohaJeff
5.0 out of 5 stars Blue Sea builds nice stuff!
Reviewed in the United States on January 20, 2024
Style: 4 CircuitsSize: 30 AmpsVerified Purchase
You end up spending a little more for a Blue Sea product but they almost always offer a high quality part you won't have to worry about. This terminal block is made from a better-than-most plastic that doesn't split or crack when fastening it down. The terminal screws hold and don't strip out easily. It's amazing how fast the cost of a wiring project can balloon out of control but using quality parts will provide a safer system than running generic "unknown" parts.
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DRV
5.0 out of 5 stars Solid terminal block
Reviewed in the United States on March 17, 2021
Style: 4 CircuitsSize: 20 AmpsVerified Purchase
This terminal block is solid. I used them to redo the wiring on my boat. Have hot had a single failure and the connections run the amperage through in a safe and good looking manor. I'll be ordering a few more for extras.
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Timothy Denney
5.0 out of 5 stars Smaller than I thought
Reviewed in the United States on September 15, 2020
Style: 6 CircuitsSize: 20 AmpsVerified Purchase
Nothing wrong with the terminal block, but smaller than I thought. I use 14 gauge wire with heat shrink ring terminals everywhere in my boat. The ring terminals have a hole for a #10 screw. I use this size because of varying terminal block sizes on my boat, and this size is always big enough. Unfortunately, there was not enough room to get my ring terminals to fit in this block. Some filing was necessary to get them to fit, but I finally succeeded. I think the specifications for any terminal block should include wire gauge typically used for the block, and maybe the screw size.
4 people found this helpful
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Steve T
5.0 out of 5 stars Nickel plated brass. Large enough for big 10ga. terminals. Very well made!
Reviewed in the United States on May 9, 2022
Style: 12 CircuitsSize: 30 AmpsVerified Purchase
Perfect!
One person found this helpful
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Romantic-Relics
5.0 out of 5 stars Just what I needed!
Reviewed in the United States on June 1, 2022
Style: 10 CircuitsSize: 65 AmpsVerified Purchase
I used this in my bus conversion to replace a rusted terminal bar. It was exactly what I needed! I am a very happy customer!
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matthew
4.0 out of 5 stars Definitely A Good Value For The Price
Reviewed in the United States on February 11, 2023
Style: 2 CircuitsSize: 20 AmpsVerified Purchase
I mean it's a terminal block and it works as proclaimed. I wouldn't try to test the 65A rating as I'm pretty sure the contacts and the plastic mount wouldn't survive the conditions. It's also not a protected block so whoever is putting the ratings for this in the comments isn't doing the consumer any favors. All in all, I needed a small block that could handle the job in a tight place and this was the perfect size. Cost was more than fair for most other options and quality was better than some higher priced alternatives as well. Cannot complain.
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Linda Butler
5.0 out of 5 stars Perfect for the job
Reviewed in the United States on February 12, 2022
Style: 12 CircuitsSize: 30 AmpsVerified Purchase
My husband has been helping with the remodel at our church. He needed this terminal block, but he doesn’t like to shop, so he was glad I could order one for him.
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Amazon Customer
5.0 out of 5 stars Good, sturdy terminal block
Reviewed in the United States on March 20, 2020
Style: 6 CircuitsSize: 30 AmpsVerified Purchase
It's from Blue Sea, so you know it's good! We're very happy with it. Make sure you get a terminal block rated for the max amperage you'll be using with the wires on the block.
One person found this helpful
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Top reviews from other countries

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Très satisfaite…même si ce n’était pas la bonne couleur!
5.0 out of 5 stars Très bonne qualité
Reviewed in Canada on February 17, 2024
Style: 4 CircuitsSize: 30 AmpsVerified Purchase
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Très satisfaite…même si ce n’était pas la bonne couleur!
5.0 out of 5 stars Très bonne qualité
Reviewed in Canada on February 17, 2024
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Roger
5.0 out of 5 stars Great quality product
Reviewed in Canada on June 17, 2022
Style: 12 CircuitsSize: 30 AmpsVerified Purchase
Fast delivery.
Very well made. Quality noticeable when installing and connecting the terminals
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André
4.0 out of 5 stars Les vis en croix ne sont pas toujours appropriées
Reviewed in Canada on October 5, 2021
Style: 10 CircuitsSize: 30 AmpsVerified Purchase
Idéal pour une boîte de jonction sans utiliser des marettes....
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André
4.0 out of 5 stars Les vis en croix ne sont pas toujours appropriées
Reviewed in Canada on October 5, 2021
Idéal pour une boîte de jonction sans utiliser des marettes....
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Amazon Customer
5.0 out of 5 stars Buy in India with CAUTION
Reviewed in India on April 14, 2021
Style: 4 CircuitsSize: 30 AmpsVerified Purchase
This is a good product and used before. BUT the vendor in India shipped a local brand worth probably 20% of the cost. Giving one star will skew the original product rating and hence gave 5 stars. Otherwise the vendor and my experience deserves no stars.
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Trojan
2.0 out of 5 stars Smaller than a terminal block should be
Reviewed in Canada on January 23, 2020
Style: 6 CircuitsSize: 20 AmpsVerified Purchase
The dimensions of the terminal block are smaller than ones made by TE, Cinch, Molex, etc. OK for low power DIY projects like speakers, but not for higher power applications. For $1 more, can get one manufactured by TE, Cinch, Molex, etc. that is stronger and can handle a broader range of applications.
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