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RISHABH 104/80 Current Transformer
RISHABH 104/80 Current Transformer is a square-type electrical current transformer designed for current measurement and monitoring applications in generator panels, SCR panels and industrial electrical control systems. This unit features a specified current ratio of 1500A:2.5A / 3000A:5A and a rated burden of 20VA.
The current transformer reduces a high primary current to a lower proportional secondary current that can be used by compatible ammeters, measuring instruments, monitoring equipment and panel-mounted electrical devices. This allows high electrical currents to be measured without applying the full primary current directly to the connected measuring instrument.
1500A:2.5A / 3000A:5A Current Ratio
The RISHABH 104/80 Current Transformer carries a ratio marking of 1500A:2.5A / 3000A:5A. Both stated values represent the same proportional transformation ratio of 600:1. At the applicable rated primary current, the transformer provides a proportional secondary current for use with compatible electrical measuring equipment.
The current ratio must always be matched with the input rating and scale calibration of the connected ammeter or monitoring instrument. A current transformer with an incorrect ratio can cause the connected meter to display an inaccurate current value even when the equipment is installed correctly.
For replacement applications, the complete ratio marking should be compared with the original current transformer. The secondary rating, primary-current range, meter scale and wiring arrangement must all be compatible with the existing generator or SCR panel.
20VA Rated Burden
This current transformer has a rated burden of 20VA. The VA rating indicates the apparent-power load that the current transformer is designed to supply to the connected secondary circuit while maintaining its specified operating performance.
The total secondary burden can include the connected measuring instrument, terminal connections and the resistance of the secondary wiring. When selecting a replacement CT, the specified 20VA burden should be confirmed against the requirements of the complete measuring circuit.
Using a current transformer with an unsuitable burden rating may affect measurement performance. Cable length, conductor size and the power consumption of the connected instruments should therefore be considered when checking compatibility.
RISHABH 104/80 Square-Type Construction
The RISHABH 104/80 Current Transformer belongs to the RISHABH square-type low-voltage current-transformer range. Its window-style construction allows the primary conductor or busbar to pass through the central aperture of the transformer.
The 104/80 designation identifies the current-transformer frame and aperture configuration. The official RISHABH catalogue lists this frame as RISH 104/80 (45). Before replacing an existing unit, the outer dimensions, central aperture, busbar dimensions and mounting space should be checked against the original transformer and panel arrangement.
Physical similarity alone does not confirm electrical compatibility. Two current transformers may have a similar enclosure but different current ratios, burdens, accuracy classes or aperture dimensions. All available nameplate information should therefore be verified before ordering.
Generator Panel Applications
The RISHABH 104/80 Current Transformer is suitable for current-measurement circuits used in generator control panels. In these systems, the CT can provide a reduced secondary current to a compatible analog ammeter, digital meter, monitoring device or control instrument.
Generator-panel current transformers are commonly installed around a phase conductor or busbar. The connected panel instrument then displays the corresponding primary current according to the selected CT ratio and meter scale.
SCR Panel Applications
This current transformer is also intended for compatible SCR panel applications. SCR systems may require continuous monitoring of high AC current flowing through electrical power circuits. A correctly selected CT allows the panel instrumentation to monitor this current through a lower proportional secondary signal.
When the unit is used as a spare part in an SCR panel, the current ratio, rated burden, polarity markings, terminal arrangement and physical aperture must match the original design requirements.
Main Product Features
- Product type: Current transformer
- Brand: RISHABH
- Series: RISH 104 Series
- Model: 104/80 (45)
- Ratio marking: 1500A:2.5A / 3000A:5A
- Equivalent transformation ratio: 600:1
- Rated burden: 20VA
- Construction: Square-type window current transformer
- Suitable for generator panels
- Suitable for SCR panels
- Suitable for industrial current-measurement systems
- Designed for connection to compatible measuring instruments
Installation and Safety Considerations
Current-transformer installation should be completed by qualified electrical personnel. The primary conductor should be installed through the correct aperture and the CT polarity markings should be followed according to the electrical drawing.
The secondary terminals of an energized current transformer must not be left open-circuited. The secondary circuit should be connected to its intended burden or safely short-circuited using an appropriate terminal arrangement before the primary circuit is energized.
All electrical equipment should be isolated and verified as de-energized before installation, inspection or replacement work begins. The wiring diagram and panel documentation should be checked before making any connection changes.
Selection and Ordering Information
Before ordering the RISHABH 104/80 Current Transformer, confirm the complete nameplate details of the existing CT. Important information includes the 1500A:2.5A / 3000A:5A ratio, 20VA burden, model designation, accuracy class, terminal markings, aperture dimensions and mounting arrangement.
The accuracy class has not been included in the supplied product information and should not be assumed. A clear photograph of the original CT label can help confirm the exact model, class and physical configuration required for the generator panel or SCR panel.
View the official RISHABH square-type current transformer datasheet for the RISH 104 Series, technical specifications, available frame sizes and rated burden information.
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