Description
Retrofitting commercial energy meters without cutting facility power.
MBS KBU 58 500/5 A is a German-engineered 500/5 A commercial split-core current transformer featuring Class 0.5 precision and a generous 50 × 80 mm busbar aperture, engineered for non-invasive retrofit current measurement on commercial switchboards without disconnecting power.
Non-Invasive Split-Core Retrofit
Clamps directly around live commercial copper busbars or heavy cable bundles, avoiding costly building power shutdowns.
500/5 A Ratio with Class 0.5 Precision
High-accuracy current step-down compliant with DIN EN 61869-2 for commercial energy meters and plant controllers.
Generous 50 × 80 mm Busbar Window
Easily accommodates solid copper busbars (up to 50 × 80 mm) or multiple large parallel cables.
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 500 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.
Takes 30 kA short-time thermal current
Thermal short-time current rating reaches 60 times rated current for 1 second, supporting 30 kA fault tolerance.
Fits heavy distribution busbars
Large 50 by 80 mm aperture encloses standard flat copper profiles without custom mounting brackets.
Talks to standard 5 A meter inputs
Delivers standard 5 A secondary signals to GoodWe GM330 and Chint DTSU666-CT energy meters.
Technical data
Non-invasive split-core current sensing engineered for commercial switchboards, zero-export control, and peak shaving.
500/5 A German-engineered split-core current transformer with 50 × 80 mm busbar window.
Manufactured in Germany by MBS AG, the KBU 58 500/5 A enables non-invasive retrofit current measurement on commercial switchboards and large busbars. Its split-core snap-together design allows installation around existing 50 × 80 mm busbars without shutting down facility power or cutting heavy conductors.
- Ratio
- 500/5 A
- Precision
- Class 0.5
- Large Window
- 50 × 80 mm
- Power Shutdown
- Zero
Model & Type
- Brand
- MBS AG (Germany)
- Series
- KBU 58
- Model
- KBU 58 500/5A 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)
- 500
- Secondary current (A)
- 5
- Rated burden (VA)
- 2.5
- 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
- 60 × 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 58 500/5 A split-core current transformer, Class 0.5 belongs in, what to verify before quoting, and when another model is the better pick.
Commercial Solar & Hybrid Inverter Metering (350 A to 500 A Service)
Commercial switchboards with main service ratings between 350 A and 500 A installing a Chint DTSU666-CT or GoodWe GM330 smart meter.
500/5 A ratio matches 350–500 A commercial service lines, installing without power interruption.
- Confirm this model against the adjacent rating in the same family
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 58 500/5 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.