Control of Power and drives in Railways, requires expertise in Power Electronics. Electrohms offers a range of accurate, reliable transducers for the measurement of current and voltage , that provides control and protection signals for locomotive and stationary track side applications.


Traction Converters
The traction inverter has to convert energy efficiently and power the drive motors of the locomotive. The conversion of energy (from direct current into three-phase alternating current) is made possible only by state-of-the-art power electronics.  ELECTROHMS offers closed loop current sensors and  hall effect based voltage transducers for these critical traction converter applications.
Auxilary Converters
Auxilary converter forms part of the auxiliary drive system in the ac locomotive which is primarily used for supplying power to loads such as fans, blowers, lighting the cabin and also charging the locomotive battery. It  typically has  a  IGBT configuration and is fed from the auxiliary winding of the locomotive transformer. ELECTROHMS has developed current sensors to meet the specifications of the manufacturers.
Electronic Rectified Regulated Unit
The ERRU 4.5Kw & 25 kW used in Indian Railway AC, non AC coaches , has input supply of 3-phase AC voltage generated from a brushless alternator. The output of the alternator is an  AC  variable voltage and variable frequency depending on the speed  of the train. The  AC voltage is converted to regulated DC voltage as required for AC and non AC coaches. It also charges a battery bank through a voltage and current controller. ELECTROHMS  closed loop current sensors are  being used by  manufacturers of  ERRUs for Indian Railways.

Featured Product

Hall Effect Current Sensor, Closed Loop These products are used in measurement of Alternating and Direct Current in electrical and electronic equipments such as SMPS, UPS, industrial drives AC drives & DC drives, Control in process application like light control, Heater load control etc


The measured voltage, VP, is applied directly to the sensors primary connections through a resistor network followed by signal conditioning circuitry into a high isolation, precision optical amplifier stage. The isolated output is amplified through a precision linear circuit producing an output signal which is completely isolated from the primary and is an exact representation of the input voltage. The power conditioning circuits feeding the optical stage is designed with an even higher isolation to the signal circuitry to ensure adequate protection to the application power electronics


Integrated primary resistor: VHASM series - An integrated primary resistor networks determines the nominal measuring voltage of the transducer. Electrohms offers a wide selection of nominal voltage levels to cover a variety of applications.



Custom Solution Design

When an off-the-shelf component won't work, we can partner with you to design and produce custom current and voltage sensors for your unique needs. Whether your challenge is regulatory compliance or technology innovation, we can help reduce time to market and improve your bottom line.

We carefully investigate the design objectives based on the inputs received from you.
Based on cost, size, packaging, electrical performance, certification or approvals required, we create a template of product design.
Quote submitted with clear specifications, lead times for prototype and production batches, along with commercials.
Prototyping ensures quick shipment and reduction in approval time.
After acceptance of prototypes, a test and acceptance criteria is prepared and same is set up for the regular production batches by our production and Quality assurance team.
We ensure that the product required is delivered within the accepted schedule. Hence, if you require a customized solution, we are the right organization to be contacted.