Why Choose the ABB CT1M-4 800 Current Transformer?
The ABB CT1M-4 800 is a through-primary 800/5 A current transformer designed for indirect measurement of electrical network parameters. Supplied under ABB order code 2CSG280355R1000, it transforms a rated primary current of 800 A into a proportional 5 A secondary current for compatible energy meters, ammeters and multifunction measuring instruments.
Part of ABB's CT1M current-transformer range, the CT1M-4 800 is designed in accordance with IEC 61869-2. It provides a best accuracy class of 0.5, with rated burdens of 10 VA at class 0.5, 10 VA at class 1 and 12.5 VA at class 3, supporting dependable current and energy measurement in commercial and industrial installations.
The CT1M-4 format accommodates cables up to 31 mm and horizontal or vertical busbars up to 40 × 10 mm or 30 × 20 mm. With compact 78 × 62 × 40 mm dimensions, IP20 protection and a rated frequency of 50–60 Hz, the CT1M-4 800 is well suited to switchboards, distribution panels and energy-metering assemblies.
Key Advantages
- 800/5 A transformation ratio for indirect AC current measurement.
- Best measurement accuracy of class 0.5.
- 10 VA rated burden at class 0.5.
- 10 VA rated burden at class 1.
- 12.5 VA rated burden at class 3.
- Standard 5 A secondary output for compatible metering equipment.
- Suitable for cables and both horizontal and vertical busbars.
- Busbar and mounting-foot fixings supplied as standard.
- Optional DIN rail mounting adapter available for flexible panel installation.
- Designed in accordance with IEC 61869-2.
Key Features
- ABB CT1M-4 series current transformer.
- 800 A rated primary current.
- 5 A rated secondary current.
- 800/5 A transformation ratio.
- Accuracy class 0.5.
- 50–60 Hz rated frequency.
- IP20 protection rating.
- Through-primary current-transformer construction.
- Maximum cable diameter of 31 mm.
- Supports horizontal and vertical busbars up to 40 × 10 mm or 30 × 20 mm.
- Compact 78 × 62 × 40 mm construction.
Reliable Indirect Current Measurement for High-Current Metering
Current transformers allow electrical measuring instruments to monitor circuits carrying currents well beyond their direct-input capability. The ABB CT1M-4 800 converts a rated 800 A primary current into a proportional 5 A secondary current, providing a standardised signal for compatible energy meters, ammeters and multifunction monitoring equipment.
With class 0.5 accuracy available at a substantial 10 VA burden, the CT1M-4 800 is suited to demanding electrical metering and load-monitoring installations. Its through-primary design supports both cables and busbars, while supplied mounting-foot and busbar fixings plus an optional DIN rail adapter provide flexibility when integrating the transformer into new electrical distribution assemblies.
Typical Applications
- Indirect electrical current measurement up to 800 A.
- Energy meters with 5 A current-transformer inputs.
- Ammeters and multifunction electrical measuring instruments.
- Main and sub-distribution switchboards.
- Commercial and industrial electrical distribution systems.
- Busbar-based metering installations.
- Energy monitoring and load-analysis systems.
