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Spade connectors, also known as flat spade connector, fork type spade connector, fork type connector, or spade lug, are widely used electrical conducting devices found in many different industries and applications. They are commonly used in applications such as wiring harnesses, power distribution systems, circuit protection and grounding systems, and electronic components and assembly processes. The popularity of spade connectors lies in their ease of assembly, typically requiring little or no knowledge of soldering or splicing of electrical conductor materials, and their reliable current-carrying capability through a fast and efficient connection.

The most common type of spade connector is the insulated type, also referred to as an insulated or insulated spade connector. This type of connector is used to make a tight electrical connection between two different components, such as a battery or a power supply. The insulated spade connector is usually constructed from a metal or plastic tube filled with insulating material. This tube is then attached to an insulated wire or cable. A spring-loaded metal prong on the connector is pushed into place with a screw-in tool, creating a secure connection.

Spade connectors may also be used to connect two sections of wire together. Commonly referred to as a splice connector, this type of connector typically features two or more short, spring-loaded blades that are pushed through the insulation of one wire and then inserted into the insulation of the other wire. Once inserted, the blades spring back to hold the two wires firmly together. This type of spade connector can be used in a broad range of applications including splicing wires, connecting circuit boards, and connecting multiple junction blocks.

Spade connectors come in a wide range of sizes and shapes, designed to suit the specific application requirements. Common spade connector sizes range from 0.1875" to 1.25" in diameter. The connector\'s shape, size, and features may vary depending on the specific requirements of an application. Some of the more popular spade connector shapes include flat, stepped, and round spades.

The working principle of a spade connector is fairly straightforward. When two properly-shaped spades are plugged into a connector, the two spade\'s rubber tips fit snugly against the connector body, creating a pressure-seal. This seal helps to keep moisture and dirt out of the connection, while also preventing electrical energy from flowing. However, if the connection is properly wired, the current can flow through the spade—as if there was no connection present.

Spade connectors are a common choice of connection for many electrical and electronic projects. Their ease of installation, reliable current-carrying capabilities, and variety of sizes and shapes make them the perfect choice for countless applications, from wiring harnesses to power distribution systems, circuit protection and grounding systems, and many other electronic assembly processes.

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