The DS4820R10 is a relay module designed to fit into the Mark IV series from GE. The MKIV, which is designed to manage gas or steam turbine systems, was released by GE in 1982, and replaced their earlier Mark I and Mark II systems. The MKIV uses several microprocessors to monitor the turbine system simultaneously. The MKIV has improved reliability as compared to earlier Speedtronic systems.
The DS4820R10 is a large gray panel module built with multiple components. The module is identified by a GE tag and its component number. The panel is designed to attach to a larger housing or frame, using screws inserted into screw mount holes cut into top hat flanges located on the right and left edges of the panel.
The DS4820R10 has four smaller metal plates screwed to its surface. These are located in a line on the top edge of the DS4820R10. Two of these plates are solid, without any components. One has a two-pin female mating connector inserted mounted into its center. One has a 12-pin (three by four) female mating connector mounted into its center.
Located below the plates mentioned above, the front of the DS4820R10 has six lines of terminal strips. There are two strips per line. Each terminal strip has twelve screws. Each terminal strip is designed to have a cover plate, and each attaches to the front of the DS4820R10 by two metal screws.
To the right of the terminal strips mentioned above, the front of the DS4820R10 has five rows of multi-cable connectors. Each cable connector is round, with a center connection and radial connections around the edge of the circle. Each connector is female. Each block of connectors has three of these round connectors, and each row has three blocks of connectors.
To the top and side of the cable connectors mentioned above, there are vertical mounts for organizing wires.
All technical support for the DS4820R10 was originally provided by General Electric.