Why Choose the ABB CM-CT 300/5 Current Transformer?
The ABB CM-CT 300/5 (1SVR450117R5100) is a precision 300/5 A current transformer designed for accurate measurement and monitoring of alternating current in industrial electrical installations. As part of the ABB CM-CT current transformer series, it converts high primary currents into a proportional, standardised secondary current suitable for connection to compatible measuring instruments, monitoring relays and electrical control systems.
This current transformer provides dependable current measurement while electrically isolating connected measuring equipment from the primary circuit. Its Class 1 measurement accuracy and 5 VA rated burden make it suitable for industrial current monitoring, electrical distribution systems and automation applications where reliable current measurement is essential.
With a 300 A rated primary current, a 5 A rated secondary current and a 60:1 transformation ratio, the CM-CT 300/5 enables accurate monitoring of high-current AC circuits. Its compact plug-in construction, supplied mounting accessories and optional DIN rail mounting capability provide flexible installation within electrical control panels and industrial distribution equipment.
Key Advantages
- Reliable 300/5 A current transformer designed for industrial AC current measurement.
- 300 A rated primary current suitable for monitoring high-current electrical circuits.
- 5 A rated secondary current compatible with industrial measuring instruments and monitoring relays.
- Class 1 measurement accuracy supports dependable electrical current monitoring.
- 5 VA rated burden provides suitable output capacity for compatible measurement circuits.
- 60:1 transformation ratio converts primary current into a proportional secondary current.
- Galvanic isolation between primary and secondary circuits supports safer integration with measuring equipment.
- Compact plug-in current transformer design simplifies installation around suitable primary conductors.
- Supplied with foot angle, insulating protective cap and bar fastening screws.
- Optional DIN rail mounting using the compatible ABB CM-CT A snap-on fastener.
- Suitable for 50/60 Hz AC electrical systems.
- Robust construction supports reliable operation in industrial electrical installations.
Key Features
- ABB CM-CT current transformer series.
- 300 A rated primary current.
- 5 A rated secondary current.
- 300/5 A current transformation ratio.
- 60:1 current ratio.
- 5 VA rated output burden.
- Accuracy Class 1 for measurement applications.
- Designed for alternating current measurement.
- 50/60 Hz operating frequency.
- Electromagnetic current transformation with electrical isolation between primary and secondary circuits.
- Plug-in design for installation around a suitable primary conductor or busbar.
- Compatible with round conductors and rectangular busbars within the transformer's opening dimensions.
- Screw-terminal secondary connections for connection to measuring and monitoring equipment.
- Primary polarity identification using K/P1 and L/P2 markings.
- Secondary polarity identification using k/S1 and l/S2 markings.
- Supplied with mounting foot angle, insulating protective cap and bar fastening screws.
- Optional DIN rail installation using the ABB CM-CT A mounting accessory.
- Compact dimensions for integration into industrial control cabinets.
Technical Specifications
- Manufacturer: ABB
- Series: CM-CT Current Transformers
- Model: CM-CT 300/5
- ABB order code: 1SVR450117R5100
- ABB product group: 310921-Measuring & Monitoring Relays
- Product type: Current transformer
- Transformer design: Plug-in current transformer
- Application: AC current measurement and monitoring
- Rated primary current: 300 A
- Rated secondary current: 5 A
- Current transformation ratio: 300/5 A
- Transformation factor: 60:1
- Rated burden: 5 VA
- Accuracy class: Class 1
- Operating frequency: 50/60 Hz
- Measured current type: Alternating current (AC)
- Primary connection: Conductor or busbar through transformer opening
- Secondary connection: Screw terminals
- Primary polarity markings: K/P1 and L/P2
- Secondary terminal markings: k/S1 and l/S2
- Conductor opening diameter: Approx. 26 mm
- Compatible rectangular busbar: Up to 30 × 10 mm
- Mounting type: Panel or busbar mounting; optional DIN rail mounting
- DIN rail accessory: ABB CM-CT A, 1SVR450118R1000
- Supplied accessories: Foot angle, insulating protective cap and bar fastening screws
- Dimensions (H × W × D): 78.5 × 61 × 48 mm
- Net weight: Approx. 0.252 kg
- Country of origin: Germany
- EAN: 4013614376924
Reliable AC Current Measurement for Industrial Electrical Systems
Current transformers such as the ABB CM-CT 300/5 are essential components in electrical measurement and monitoring systems. They enable high alternating currents to be measured using standard instruments by converting the primary current into a lower, proportional secondary current. This allows compatible ammeters, measuring relays and monitoring equipment to measure electrical loads without carrying the full primary circuit current.
The CM-CT 300/5 operates with a 300/5 A transformation ratio, meaning that a primary current of 300 A corresponds to a secondary current of 5 A under rated conditions. At a primary current of 150 A, the corresponding secondary current is approximately 2.5 A. This proportional relationship allows monitoring equipment to determine the primary circuit current using the transformer's rated ratio.
The transformer's Class 1 accuracy and 5 VA rated burden make it suitable for industrial measurement applications where dependable current information is required. Its electrical isolation helps protect connected measuring equipment from direct exposure to the primary current path, while the compact construction enables installation in control cabinets, distribution boards and industrial electrical panels.
The CM-CT 300/5 is supplied with a foot angle, insulating protective cap and bar fastening screws for mechanical installation. An optional ABB CM-CT A snap-on mounting accessory enables DIN rail installation where required. For safe operation, the secondary circuit must be connected to a suitable burden or safely short-circuited before the primary circuit is energised; the secondary terminals must never be left open-circuit while primary current is flowing.
Typical Applications
- Industrial AC current measurement and monitoring systems.
- Electrical distribution boards and switchgear assemblies.
- Industrial control panels and automation cabinets.
- Current monitoring relays and measuring instruments.
- Electrical load monitoring in manufacturing facilities.
- Motor feeder current measurement and monitoring.
- Industrial power distribution and energy monitoring equipment.
- Building electrical management and monitoring systems.
- Machine control systems requiring isolated current measurement.
- OEM electrical panels and industrial monitoring installations.
