ABB E1 and E2 refer to two frame sizes within the ABB SACE Emax low-voltage air circuit breaker (ACB) family. These are modular, high-performance circuit breakers designed for the protection of main distribution feeders, large loads, and generators in low-voltage electrical installations.

The ABB 1SDA038324R1 is a low-voltage, split-core, wrapping-type current transformer (CT) designed for retrofit installation and energy measurement in existing low-voltage switchgear and distribution boards without the need to disconnect the primary conductor.

The ABB PR121/P is a compact, electronic trip unit designed for integration into specific ABB molded case circuit breakers (MCCBs), primarily the SACE Tmax XT series. It serves as the "intelligent brain" of the breaker, replacing traditional thermal-magnetic mechanisms with configurable digital protection, measurement, and communication capabilities.

The ABB SACE L4025H is a low-voltage, fixed-mounted, high-performance air circuit breaker (ACB) from ABB's renowned SACE Emax series. This specific model belongs to the E4 frame size within the Emax family, designed for high-current applications requiring reliable protection, switching, and monitoring.

The ABB REX521GHHGSH50G is a fully-configured, high-performance numerical protection and control relay from the ABB Relion® 650 series (REX521 line). This alphanumeric code is a positional ordering key that defines the exact hardware configuration of the device, including its power supply, communication interfaces, and input/output (I/O) modules. It is engineered for comprehensive protection, control, monitoring, and automation of medium-voltage feeders, transformers, and other critical assets in substations and industrial power systems.

The ABB PR122/P-LSI is an advanced electronic trip unit designed for integration into specific ABB low-voltage air circuit breakers (ACBs), primarily the Emax 2 series. It serves as the "intelligent brain" of the breaker, providing configurable protection, measurement, and communication capabilities.

The ABB REA 107-AA is a window-type (bushing-type), cast resin insulated current transformer (CT) designed for measurement and protection purposes in medium-voltage (MV) switchgear and electrical installations. As a window-type CT, it has a central circular or rectangular opening through which the primary conductor (typically a busbar or cable) passes, serving as a single-turn primary winding. The cast resin insulation provides excellent mechanical strength, moisture resistance, and dielectric properties, making it suitable for indoor use in harsh environments.

The ABB VD4/CX refers to a medium-voltage, indoor, vacuum circuit breaker from ABB’s renowned VD4 family. The “/CX” suffix indicates a specific design series, often featuring enhanced safety, modularity, and advanced control options. The following codes detail its specific configuration, making it a fully defined circuit breaker ready for installation in switchgear panels (e.g., UniGear, ZS1).

The ABB HCFDACADANB2BAN21E is a modular, multi-channel actuator from the ABB i-bus® KNX product family, specifically belonging to the “System pro M” series of DIN-rail mounted devices. It is a configurable binary input and relay output module designed for building automation and control via the KNX/EIB standard.

The ABB GS251S C16/0.03 is a highly specialized, compact rotary switch-disconnector from the ABB System Pro M GS series. This specific configuration combines a 63A frame, 3-pole switch-disconnector with a front-mounted rotary handle (C16) and includes an integrated low-current fuse or protection element rated at 0.03A (30mA).