Cube Connectors – Functions, Properties & Design

The cube connector is an electronic component used to connect signal lines. It was originally developed to reliably handle the dynamic movements of headphones during use. In this application, the cube connector has since been almost completely replaced by jack plugs. In hydraulics, however, it is still widely used. It has been shown that no other connector shape could provide the required reliability and flexibility. That is why it is still in use for controlling valves.

Properties of Cube Connectors

The most significant characteristic of the cube connector is its shape. The head of the connector is indeed cube-shaped. Its transition from hi-fi electronics to hydraulics was also facilitated by the fact that its voluminous head allows for the integration of additional applications. This includes, for example, the integration of an LED that provides information about the respective switching status.

The main advantages of cube connectors:

• Secure fit
• Rotatable
• Resistant to oils and greases
• Good sealing of the contact point
• Standardized sizes
• Widespread use
• Can be used in a temperature range from -25°C to +85°C, depending on manufacturing quality

Functions of Cube Connectors

The cube connector’s function is to control motor-driven valves. This makes it very popular in all hydraulic systems. This includes not only the control of pressure and control valves in hydraulic power transmission. Above all, its robustness against varying temperatures makes the cube connector very suitable for regulating hydraulic cooling systems. The connector only requires a connection to a control unit and an interface. Typical applications for cube connectors are:

• Central control of ball valves
• Alternating control of pressurization
• Opening and closing of tanks
• Regulation of coolers
• Support for hybrid control systems
• Regulation of electromagnetic directional control valves

Designs of Cube Connectors

The designs of cube connectors can be roughly divided into “small cube connectors” and “large cube connectors.” In between, there is a rectangular transitional form.

Small Cube Connector

The small cube connector has a diameter of 15 or 16 millimeters. It is approximately 23 millimeters high and, including the connection sleeve, approximately 28 millimeters long. The connection depth is approximately 8 millimeters. It is also referred to as a C or CI connector. It is particularly popular for use in very small installation spaces. However, its performance is significantly limited compared to the large cube connector.

Transitional Form: The B/BI Connector

The B/BI connector is a transitional form between the small and large cube connector. Its connection shape is rectangular rather than square. This means it can only be rotated by 180° and not by 90° like all other cube connector designs. This limits its usability somewhat, but still makes it very space-saving. The B-connector is available with a connection on either the narrow or the wide side.

Standard Form: A-Connector

The A-connector, or “large cube connector,” is by far the most common design of this electronic module. It is manufactured in a very wide range of versions and variations. With a basic shape of approximately 25 × 25 millimeters, it offers sufficient space for various applications. Common features include:

• 3, 4, or 5-pin connection
• Circuitry with LED, Zener diode, or similar
• Double design for valves with two solenoid switches

Its widespread use and high variability will ensure that the cube connector remains the standard connection module in hydraulic applications for a long time to come.