KS / KSO / KSW — low-voltage current transformers (busbar, split-core, ring-type up to 10 000 A)

KS / KSO / KSW — low-voltage current transformers (busbar, split-core, ring-type up to 10 000 A)

Country: Germany · Model: KS / KSO / KSW

The KS, KSO and KSW low-voltage current transformers are rated for a nominal voltage up to 1 kV, and in the ring version they take a primary current up to 10 000 A. They are installed in metering and protection circuits of 0.4 kV switchboards, from the incomer to the outgoing lines.

Rated voltage: up to 1 kV
Primary current: up to 10 000 A (ring-type)
Types: busbar (KS 50…160), split-core cable, summation, intermediate, for earth-fault protection
Verification: versions with state verification

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Technical specifications

Rated voltage	up to 1 kV
Primary current	up to 10 000 A (ring-type)
Types	busbar (KS 50…160), split-core cable, summation, intermediate, for earth-fault protection
Verification	versions with state verification

Replacement for

T-0.66, TShP-0.66, TOP-0.66, TShL-0.66, TNSh-0.66 (current transformers 0.66 kV, 5–5000 A)

selected by purpose and main parameters, please confirm with the manager

Replacement pages: ТНШ-0,66, ТНШ, ТОП-0,66, ТОП, ТШП-0,66, ТШП

Specifications are taken from the manufacturer’s technical documentation. Updated 11/06/2026.

Description

The line consists of several designs for different installation places. KS 50…160 busbar types are slipped onto the switchboard bus, and the bus itself serves as the primary conductor. Clamp-on and split-core cable transformers open up, so they are mounted on an already laid cable without disconnecting the cores. Summation transformers add the secondary currents of several CTs when metering is done on the sum of several incomers or feeders. Intermediate ones match the secondary current of the main CT to the input of a meter or relay. Some versions work in earth-fault protection circuits. Ring-type units are designed for large currents up to 10 kA and sit on heavy incomers of switchboards.

How to choose

The design is determined by the conductor passing through the window and by whether the circuit can be taken apart. For a new busbar a KS 50…160 busbar type is assembled, on a live cable without dismantling a split-core cable type is installed, and for a current of several thousand amperes, up to 10 000 A, a ring-type is taken. If the meter must count the sum of several lines, a summation transformer is added, and an intermediate one for matching secondary circuits. For revenue metering with the power supply company, the version with state verification is ordered.

Request a price and lead time

KS / KSO / KSW — low-voltage current transformers (busbar, split-core, ring-type up to 10 000 A). We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

What is the maximum primary current of the KS / KSO / KSW current transformers?

Up to 10 000 A in the ring version. The rated voltage of all models is up to 1 kV.

Can a current transformer be fitted on a cable without disconnecting it?

Yes, split-core cable transformers exist for this. Their core opens and closes around the cable right in the 0.4 kV switchboard.

What is a summation current transformer for?

It adds the secondary currents of several current transformers so that one meter or relay sees the total load of several lines or incomers.

Are there current transformers with state verification for commercial metering?

Yes, some versions are supplied with state verification. They are installed in revenue energy metering points, where a CT without verification will not be accepted.

Are these current transformers suitable for earth-fault protection?

Yes, the line has separate versions for earth-fault protection circuits in networks up to 1 kV; they work together with protection relays.