Description
Retrofitting commercial energy meters without cutting facility power.
MBS KBU 58 1000/5 A is the flagship 1000/5 A German-engineered commercial split-core current transformer featuring Class 0.5 precision, a 5 VA burden rating, and a generous 50 × 80 mm busbar aperture, engineered for non-invasive retrofit current measurement on 1000 A main industrial switchboards without disconnecting power.
1000/5 A Maximum Primary Current Rating
Directly measures megawatt-scale solar grid injection and heavy industrial factory main feeds.
5 VA Increased Burden Capacity
Drives long secondary cable runs to remote control cabinets without signal attenuation or phase error.
Non-Invasive Split-Core Retrofit
Clamps directly around live commercial copper busbars or heavy cable bundles, avoiding costly building power shutdowns.
German Industrial Build Quality (MBS AG)
Flame-retardant shatterproof housing with integrated color-coded screw-clamping brackets for vibration-proof mounting.
More product details
Shutting down main factory power to slide solid-core CTs over busbars costs thousands of euros in lost production. The KBU 58 splits open with a quick-release mechanism and latches securely around conductors.
- Split-core magnetic circuit snaps open and locks securely with positive mechanical engagement.
- 50 × 80 mm aperture fits standard 1000 A commercial busbar profiles.
- High thermal short-circuit strength ($I_{th} = 60 \times I_n$) withstands extreme grid fault surges.
MBS KBU 58
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Precision magnetic core with 0.72 kV industrial insulation.
Sizing multi-inverter commercial zero-export systems requires tight synchronization between the meter and the plant controller. The KBU 58 delivers clean 5 A secondary signals. Delivers certified Class 0.5 precision across dynamic commercial load profiles. Operating voltage up to 0.72 kV AC with 3 kV dielectric insulation test voltage (1 min). Color-coded screw terminals provide secure, vibration-proof secondary lead connections.
Includes 5 VA secondary burden
A 5 VA rating provides double the secondary capacity of smaller models, ideal for extended cable runs.
Takes 40 kA short-time thermal current
Rated for 40 times rated current over 1 second, providing 40 kA thermal fault withstand on main incomers.
Pairs with commercial energy controllers
Directly feeds 5 A measurement inputs on Chint DTSU666-CT and GoodWe GM330 energy meters.
Technical data
Non-invasive split-core current sensing engineered for megawatt-scale solar plants, substation feeds, and industrial peak shaving.
1000/5 A heavy-duty split-core current transformer with 5 VA burden capacity.
Maxing out the KBU 58 series, the MBS KBU 58 1000/5 A measures high-voltage substation feeds and 1000 A main industrial switchboards. Featuring Class 0.5 precision, a 5 VA rated burden, and a large 50 × 80 mm busbar aperture, it delivers robust, non-invasive current sensing for megawatt-scale solar installations.
- Ratio
- 1000/5 A
- Precision
- Class 0.5
- Heavy Burden
- 5.0 VA
- Power Shutdown
- Zero
Model & Type
- Brand
- MBS AG (Germany)
- Series
- KBU 58
- Model
- KBU 58 1000/5A Kl.0,5
- Type
- Split-core (divisible) current transformer
- Core
- Divisible, fits over a live conductor or busbar
- Manufacturer SKU (series)
- 80038
- Origin
- Made in Germany
Electrical
- Primary current (A)
- 1000
- Secondary current (A)
- 5
- Rated burden (VA)
- 5
- Accuracy class
- 0.5
- Nominal frequency (Hz)
- 50
- Max. operating voltage Um (kV)
- 0.72
- Insulation test voltage
- 3 kV, Ueff, 50 Hz, 1 min
- Thermal rated continuous current Icth
- 1.0 × IN
- Thermal rated short-time current Ith
- 40 × IN, 1 s
- Insulation class
- E
Mechanics
- Busbar window (mm)
- 50 × 80
- Round conductor (mm)
- 50
- Width (mm)
- 125
- Height (mm)
- 158
- Depth, overall (mm)
- 58
- Housing
- Unbreakable grey polycarbonate, flame retardant, ultrasonically welded
- Secondary terminals
- Nickel-plated, M5 × 10 mm, with integrated covers
Environment
- Operating temperature (°C)
- -5 ~ +40
- Storage temperature (°C)
- -25 ~ +40
Project fit
Where this model fits.
Scenarios that show which projects the MBS KBU 58 1000/5 A split-core current transformer, Class 0.5 belongs in, what to verify before quoting, and when another model is the better pick.
Megawatt Solar Plants, Substation Feeds & Heavy Industrial Services (800 A to 1000 A+)
Large industrial facilities, multi-megawatt ground mounts, or utility feeds carrying up to 1000 A installing a GoodWe SEC1000 or SAJ eManager-C1 Pro plant controller.
1000/5 A ratio and 5 VA burden handle massive currents and long cable runs to remote control cabinets.
- BoundaryIf the facility's main electrical service rating is under 800 A, step down to match the exact service size. ---
- If the facility's main electrical service rating is under 800 A, step down to match the exact service size. ---
Documents
MBS KBU 58 Kl.0,5 datasheet (DE)Product questions
How many CTs are required for a three-phase system?
3 current transformers (one for each phase: L1, L2, L3). Measuring a three-phase electrical panel requires 3 units of the KBU 58 1000/5 A CT, installed with identical orientation (P1 facing the grid side, P2 facing the load side).
System components
Required components
Chint DTSU666-CT smart meter
Item number: DLK-CHINT-DTSU666CT
DTSU666-CT needs 3 external current transformers with a 5 A secondary (not included in the meter): KBU 58 supplies exactly that interface.
Recommended components
GoodWe GM330 smart meter
Item number: DLK-GOODWE-GM330
GM330's CT input accepts an n:5A ratio, matching KBU 58's fixed 5 A secondary, for GoodWe-inverter export control/monitoring.
Optional components
GoodWe SEC1000S Smart Energy Controller
Item number: DLK-GOODWE-SEC1000S
SEC1000S bundles a GM3000 meter that also accepts an n:5A CT ratio, for multi-inverter parallel export control on GoodWe ET 5-10 kW sites.