ABB 3P12-750 Current Transformer

ABB CM-CT 75/5 Current Transformer, commonly listed as the 3P12-750 set, is a three‑phase current transformer assembly that converts 75 A per phase of primary current to a 5 A secondary current for metering and protection circuits. The official ABB part number associated with this model is 1SVR450116R5100, and the unit is specified for 50/60 Hz operation with a burden rating of 1.5 VA and an accuracy class of 1. The nominal ratio of 75:5 (15:1) per phase enables standard metering relays and protection equipment to read a scaled representation of high currents, while preserving accuracy within its class. This three‑phase transformer set is designed for use in distribution panels and switchgear environments where concurrent phase measurements are required, supplying a reliable current signal to metering and relay inputs. Availability and support for this model vary by region, and it is listed by major retailers as discontinued in some catalogs. When selecting a substitute, ensure an exact 75/5 ratio, 50/60 Hz compatibility, and a 1.5 VA burden to match the referenced ABB specifications and maintain measurement accuracy in your system. Common applications include energy metering, protection relays, and control circuits in industrial power distribution.