Kohshin / Kohshin Electric industrial current sensors and meters

Industrial current sensors and precision measurement instruments engineered by Kohshin / Kohshin Electric for variable frequency drives, servo drives, and automation systems.

Open loop bolt-on current sensors series HC-TN

Open loop current sensors by Kohshin / Kohshin Electric series HC-TN are engineered for busbar installation in industrial frequency drives. The units monitor direct and alternating currents from 50 to 800 A, providing electrical isolation and linear analog output.

Nominal current sensing range from 50 to 800 A with proportional 4 V output
Bipolar control power supply of plus-minus 15 V with high ripple suppression
Direct busbar mounting geometry with rigid mechanical fixing for power links
Fast response performance below 10 microseconds for dynamic circuit protection

Precision closed loop current sensors series HS-UF

Closed loop current sensors by Kohshin / Kohshin Electric series HS-UF operate on the magnetic balance principle with active feedback. They deliver superior measurement precision, negligible zero offset drift, and wide frequency bandwidth up to 100 kHz for servo drives.

Active magnetic balance feedback eliminating offset drift across temperatures
Nominal rating from 100 to 300 A with extended bandwidth reaching up to 100 kHz
High linearity characteristics suited for precise closed-loop motor regulators
Rugged enclosure shielding magnetic circuitry from external switching noise

Compact PCB mounting current sensors series HC-PG

Current sensors by Kohshin / Kohshin Electric series HC-PG are designed for through-hole soldering directly onto power inverter printed circuit boards. The compact package minimizes board area while maintaining resilience against current surges and equipment vibration.

Through-hole PCB pin terminal layout ensuring durable mechanical retention
Rated sensing range from 50 to 300 A suited for high density power board arrays
Dielectric insulation resistance exceeding 500 MOhm measured at 500 V DC level
Thermal stability across wide ambient operating temperatures on industrial sites

Digital current sensors and Hall IC units series HD-TS

Digital current sensing units by Kohshin / Kohshin Electric in series HD-TS and HP-AR combine magnetic sensing elements with dedicated signal conditioning microcircuits. This integrated design boosts noise immunity when operating adjacent to high-speed inverter switches.

Integrated microcircuit conditioning providing robust signal amplification
Current detection ratings up to 600 A for HD-TS and 1150 A for HP-AR families
Immunity against rapid voltage transients generated by IGBT power switches
Direct hardware compatibility with digital automated control board inputs

Electrical panel indicating meters and transducers

Analog and electronic panel meters by Kohshin / Kohshin Electric are built on proven manufacturing expertise developed through long-standing OEM instrumentation lines. The meters display current, voltage, and power, maintaining reading accuracy under mechanical vibration.

High accuracy classes on analog scales for industrial monitoring routines
Versatile configurations covering panel ammeters, voltmeters, and wattmeters
Impact resistant front housing geometry with secure panel cutout mounting
Standardized cutout formats fitting distribution switchgear enclosures

Zero-phase current transformers ZCT and EMC magnetic cores

Magnetic components by Kohshin / Kohshin Electric encompass zero-phase current transformers ZCT, measurement CTs, and noise suppression ferrite cores. The devices enable early earth leakage detection and suppress high-frequency conducted interference in automated equipment.

ZCT units engineered for sensitive ground leakage fault protection relays
High permeability Mn-Zn and Ni-Zn ferrite cores for wideband EMC suppression
Generous cable aperture diameters accommodating heavy insulated power feeds
Enhanced electromagnetic compatibility for automated production cell drives

Classification of Kohshin current sensors by measuring architecture

Japanese manufacturer Kohshin / Kohshin Electric develops two fundamental categories of Hall effect current measurement units: open loop and closed loop architectures.

Open loop sensors in the HC-TN and HC-PG families measure magnetic field intensity within the gap of a ferrite core utilizing a sensitive Hall element. The resulting analog voltage directly reflects the primary conductor current.

Closed loop sensors in the HS-UF lineup operate via magnetic balance feedback: a secondary coil continuously cancels out primary magnetic flux. This active cancellation delivers minimal temperature offset drift and wide frequency bandwidth up to 100 kHz required for high speed servo systems.

Installation considerations for HC-TN sensors on heavy busbars

Open loop sensors by Kohshin / Kohshin Electric in the HC-TN range mount directly onto primary busbar conductors within industrial power converters and frequency drives.

The central aperture accommodates rectangular busbar profiles, with screw clamp fixtures providing mechanical stability during intense machinery operation.

Proper electrical clearances and creepage distances are preserved to maintain galvanic isolation integrity between primary busbars and low voltage monitoring electronics.

The robust polymer housing effectively transfers thermal energy away from the copper bar, shielding internal semiconductor circuitry from elevated temperatures.

Deployment of current sensors in variable frequency motor drives

In automated variable speed drives and traction inverters, Kohshin / Kohshin Electric current sensors deliver critical phase current feedback to digital motor controllers.

Accurate real-time tracking of instantaneous currents enables pulse width modulation algorithms to regulate rotor torque smoothly. Sub-10 microsecond response times allow protective circuits to interrupt power switches during motor stall or ground short faults before damage occurs.

Isolated signal acquisition prevents ground loops between high voltage busbars and microprocessor logic boards.

Operating advantages of HS-UF precision closed loop sensors

Precision closed loop current sensors by Kohshin / Kohshin Electric in the HS-UF series serve critical circuits in robotics, servo drives, and uninterruptible power systems.

Because internal magnetic flux is continuously balanced to zero, core hysteresis errors are eliminated, yielding exceptional linearity and thermal stability. These sensors monitor direct currents during battery floating alongside high frequency inverter switching currents.

Internal electromagnetic shielding protects the Hall element against stray fields produced by adjacent reactors and power transformers.

Nomenclature and engineering criteria for sensor replacement

Selecting appropriate replacement sensors by Kohshin / Kohshin Electric involves matching primary rated current and control circuitry voltages.

In typical part numbers such as HC-TN100V4B15, the HC-TN prefix denotes an open loop bolt-on sensor family, the 100 numeric value specifies a 100 A nominal measuring threshold, the V4 token designates a 4 V rated output amplitude, and the B15 suffix identifies a bipolar plus-minus 15 V control supply requirement.

Supplying equipment nameplate photos or part number stampings ensures identical physical dimensions and connector pinouts.

Electromagnetic compatibility and noise filtering with magnetic cores

Rapid switching in power electronic converters generates high frequency conducted and radiated electromagnetic noise across control lines. To ensure electromagnetic compatibility, Kohshin / Kohshin Electric manufactures specialized ferrite suppression cores and zero-phase current transformers ZCT.

Ferrite ring cores absorb common-mode high frequency spikes along sensor wiring harnesses, avoiding false controller triggers. Zero-phase current transformers continuously monitor multi-phase line balance, detecting leakage currents to earth for dependable electrical safety.

Kohshin / Kohshin Electric and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Kohshin / Kohshin Electric and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.