5 Best Marine Terminal Blocks (Reviews Updated 2022)

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Electronics are used on boats for multiple purposes. Lights require electricity, as do speakers, receivers, navigation systems and many other pieces of equipment. Where there are electronics, there should be electrical terminals. A marine terminal block is a modular block with an insulated frame which secures two or more conductors.

Best Marine Terminal Blocks

Here are our Marine Terminal Block reviews.

1. JQuad 12 Terminal Distribution Block

(pair Red & Black) 12 Terminal Distribution Block Busbars With Ring Terminals

The JQuad 12 Terminal Distribution Block is a pair of marine terminal blocks available in red, black or one of each color. This product has a ¼ inch stud and is ideal for a variety of wiring scenarios. It is an affordable, quality option.

  • 12 stainless steel terminal screws
  • Rated for 180 amps at 12v DC
  • Corrosion resistant
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2. Blue Sea Systems Terminal Blocks

Blue Sea Systems Terminal Blocks 20a 65a

The Blue Sea Systems Terminal Blocks is a grouped circuit ideal for use in a marine setting. This marine terminal block is made by the reputable blue sea systems who a known for producing quality marine products. It has a closed back design for complete insulation from the mounting surface.

  • Each screw pair is one isolated circuit
  • Jumpers allow creation of common circuits
  • 20 AMP 12v DC rating
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3. Blue Sea Systems ST Blade Block

Blue Sea Systems St Blade Ato Atc Fuse Blocks

The Blue Sea Systems ST Blade Block combines durability with high functionality. Its unique block design has 6 circuits with negative bus and covers. It is available in a variety of designs and sizes to fit particular needs.

  • Positive distribution bus
  • Insulation cover
  • ATO and ATC blade fuses accepted
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4. Mofeez Bus Bar Terminal Distribution Block

Mofeez Bus Bar 3x1 4”post,10x#8 Screw Terminal Power Distribution Block With Ring Terminals(pair

The Mofeez Bus Bar Terminal Distribution Block is a great deal on a top-of-the-line marine terminal block. This piece of equipment comes as a pair. It includes a cover which attaches to nylon nuts to protect against short circuits.

  • Red & black simple design
  • Max voltage 48v DC
  • Nickel plated brass contact plate for low resistance
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5. Simple Electric Solutions 10 Terminal Kit

10 Terminal 150 Amp Bus Bar Kit Heat Shrink Ring Terminals Included

The Simple Electric Solutions 10 Terminal Kit is a high quality marine terminal block from a reputable manufacturer. It is an affordable option. This kit includes ten adhesive heat shrink ring terminals which provide impervious seal in harsh environments.

  • High quality tin-plated copper bus
  • 150 amps of power
  • Ten stainless steel terminals and two stainless steel studs
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Marine Terminal Block Buyer’s Guide

Choosing a marine terminal block is an important investment for a boat owner.  Prices are not very high, usually around the $30 mark.  While the price may seem quite low, a good marine terminal block is well worth investing in.  A marine terminal block is not a required piece of equipment on a boat, but multiple circuits need to be secured it is essential.

Our buying guide reviews the best marine terminal blocks on the market so you can choose the right marine terminal block for your boat.   The following features are included on most marine terminal blocks and will help you to choose which features you need on a marine terminal block for your boat.

Installation Process

Marine terminal blocks should ideally be quick and easy to install. Look for one which includes the necessary bolts and hardware this will speed up the process and have you out on the water using your marine terminal block in no time.


Boat marine terminal blocks are used to isolate the power electrical items onboard a boat; therefore they need to give out certain amounts of power. Many marine terminal blocks will give out 12v of power, whilst being compatible with 6v electrical items also. Marine terminal blocks which feature a multiple design are capable of isolating multiple electrical items at once and therefore require more power.


Marine terminal blocks are made of corrosion-resistant materials because they are installed at on a boat where there may be a possibility that it will be exposed to water and sea spray.  Common materials include durable plastics and metals.  Be sure to buy a marine terminal block that is made of high-quality materials for a long service life.

Safety Features

Marine terminal blocks should be fitted with certain safety protection features. These features include reverse polarity, ignition protection, spark-proof technology, thermal protection, and protection from over isolating. These features ultimately ensure that the battery marine terminal block is as safe as possible and minimize the risk of anything going wrong.