Precision Current Transformers (CTs)

Solid-core, busbar, split-core, and summing current transformers for switchgear metering and protection

Open sizing tools ↓Enquire about this application ↗

Precision Current Transformers (CTs)

Accurate power metering, energy management, and overcurrent protection require high-precision current transformers that step down high primary busbar currents to standardized 5A or 1A secondary signals. Nairobi Power Engineers supplies the full line of Lovato Electric DMK series current transformers.

Available in solid-core ring types, rectangular busbar pass-through windows, and easy-install split-core configurations, our CTs feature Class 0.5, Class 0.5s, and Class 0.2s measurement accuracy, sealable terminal covers, and robust flame-retardant housings.

Equipment & Range Highlights

Lovato DMK • Busbar / Cable

Conceptual precision current transformers (cts) scene; exact specifications vary.

Solid-Core Busbar Current Transformers

Precision solid-core CTs with integrated busbar clamps and DIN-rail mounting accessories, certified for accuracy Class 0.5 and Class 0.2s.

Primary Current50 A up to 4000 A

Secondary5 A • 1 A

AccuracyClass 0.5 • Class 0.2s

Retrofit • Split-Core Clamp

Conceptual precision current transformers (cts) scene; exact specifications vary.

Split-Core Current Transformers for Retrofits

Clamp-on split-core CTs with push-latch magnetic cores allowing fast installation around existing live conductors without cable unbolting.

InstallationClip-On / Retrofit

Ratios100/5A to 2000/5A

SafetyNo Cable Disconnection

Current Transformer Technical Reference

CT Family	Primary Current Spectrum	Accuracy Class & Burden	Window Dimensions
Lovato DMK 1T	50 A – 300 A (Cable Ring)	Class 0.5 / Class 1 (2.5VA – 5VA)	21 mm diameter cable hole
Lovato DMK 2T	100 A – 600 A (Busbar/Cable)	Class 0.5 / Class 0.5s (5VA – 10VA)	30×10 mm busbar / 28 mm cable
Lovato DMK 3T	400 A – 1500 A (Busbar)	Class 0.5 / Class 0.2s (10VA – 15VA)	50×12 mm / 40×40 mm busbars
Lovato DMK 4T	1000 A – 4000 A (Large Busbar)	Class 0.5s / Class 0.2s (15VA – 30VA)	80×30 mm / 100×30 mm busbars
Split-Core CTS Series	100 A – 2000 A (Retrofit)	Class 0.5 / Class 1 (2.5VA – 10VA)	24 mm to 80 mm square windows

Engineering & Build Highlights

Class 0.2s and Class 0.5s accuracy maintained even at light loads (from 1% to 120% of rated current)
Sealable transparent terminal covers prevent unauthorized tampering with utility revenue connections
Flame-retardant self-extinguishing polycarbonate housing (UL94-V0) rated for high ambient temperatures
Double screw brass terminals accommodate heavy secondary wiring with zero risk of loose connections
Supplied with busbar mounting screws, metal base mounting brackets, and snap-on DIN-rail adaptors
Rated for 720 V continuous insulation voltage and 3 kV / 1 min dielectric test withstand

Target Applications & Sectors

Main LV distribution switchboard incoming & outgoing meteringMotor control centre (MCC) feeder load monitoringAutomatic power factor correction (APFC) reactive power sensingCommercial building tenant energy sub-metering retrofitsStandby generator output current & power measurementData centre branch circuit monitoring systems (BCMS)

The CT burden (e.g. 5VA or 10VA) must exceed the total combined resistance of the secondary wiring and the connected meter input impedance. Using 2.5 mm² copper secondary wire keeps loop impedance low and ensures accuracy.

If a current transformer is energized while its secondary is open, the core saturates and induces dangerous lethal voltages (thousands of volts) across the terminals, destroying the CT insulation and endangering personnel.

Source Precision Current Transformers

Contact our sales engineers with your busbar dimensions and meter ratios for immediate stock quotation.

Discuss Your Requirement

Explore your requirements.

Try the tools relevant to precision current transformers (cts), compare scenarios, then send the inputs to our team.

Enable JavaScript for live calculations, or ask our engineering team.

Conceptual engineering scenes illustrate applications. Manufacturer reference photos are identified separately. Confirm exact models, dimensions and ratings before ordering.