High Voltage DC Contactors: Motor Contactor, Industrial Battery, EV Charger...



Besides being used as motor contactor, this type of high voltage DC contactors can also be used in many other areas.

Typical applications include:

  • battery charging for electric car and other EVs (Electric Vehicles)
  • industrial batteries
  • pre-charging of inverter capacitor
  • DC power control for frequency converter
  • circuit isolation
  • circuit protection and safety devices
  • switching power for industrial machineries

It is also widely used on uninterruptible power supplies (UPS) and other electronic control systems.

This high voltage DC Contactor series include three models:

  • ISTEK-C103 50A 750V High Voltage DC Contactor
  • ISTEK-C104 100A 750V High Voltage DC Contactor
  • ISTEK-C105 200A 750V High Voltage DC Contactor

As one of the best electrical contactor suppliers in China, we always aim for the highest quality standards.

All of these top quality contactors are available to the international clients outside China at the most competitive prices.

High voltage electrical contactor for DC Motor Control and EV Battery Charger

Want to know the price or technical details of this high voltage motor contactor series? Just contact us now.



Features and Benefits of the High Voltage DC Contactors

1 - Capable of controlling very high voltage and very high load

Epoxy sealed vacuum chamber and inside filled with inert gas, the well protected contacts plus magnetic blowouts for electric arc elimination are some of the outstanding features.  Thus make it possible for the vacuum contactor to break (cut off) the high voltage load up to 900VDC. 

2 - Wide contact switching range

With rated voltage ranging from 12Vdc to 900Vdc, this electrical contactor can cover the entire range without the need of multiple versions. 

3 – Compact and quiet

With the vacuumed contact chamber filled with inert gas and the adoption of non-arc structure, it makes possible to have very small contact gap while maintaining safe and efficient DC breaking. As the result of this optimal structure, comparing to other type of contactors – this electrical contactor is very quiet even when it breaks high current.

4 – Safe and reliable

The DC contactor’s safety and reliability are ensured by the fact that the contact is sealed inside the chamber filled with inert gas.  The arc has no way out which makes it very safe to operate.  The consistent contact resistance makes it perform reliably regardless of the environment changes.  

5 – Flexible

Some of the high voltage DC contactors can be made with non-polarized contacts which makes the wiring connections more flexible and much easier.

With the light moveable part, big counter force and less impact of gravity, the electrical contactors can be easily installed with side or bottom mounting options. 

6 - Multiple applications

These powerful high voltage DC contactors can be used for many different relay switching purposes, they include: motor contactor, battery switching and backup equipment, power control of DC voltage and circuit safety protection, etc.. 

7 – RoHS compliant

These high voltage electrical contactor products are in compliance with EU RoHS directive - 2002/95/EC. 

8 – Great price and cost effective

Relying on the optimally controlled production cost, this high voltage series product for motor contactor and other purposes offers the most competitive price in the current markets while maintaining the highest quality level.




ISTEK-C105-200A-900Vdc-Contactor-for-Electric-Cars

Want to know the price and availability of this DC contactor? Please contact us now.



Important Parameters for the High Voltage Motor Contactor ISTEK-C105 200A 750Vdc

    0. Contact Forms 

  • For product type C (i.e. ISTEK-C105 200A750V-C): Main contacts  - 1A, Polarized; No Auxiliary Contacts
  • For product type D (i.e. ISTEK-C105 200A750V-D): Main contacts  - 1A, Polarized; One Set of Auxiliary Contacts – 1A
  • For product type E (i.e. ISTEK-C105 200A750V-E): Main contacts  - 1A, Non-polarized; No Auxiliary Contacts
  1. Rated operational voltage:  Range - 12Vdc to 900Vdc; Max 900Vdc
  2. Main contact current rating (continuous): 200A Rated (65℃, 65mm² wire);  500A Max. (65℃, 150mm² wire)
  3. Aux. contact current (max): 2A / 30Vdc or 3A / 125Vac
  4. Break Current (max):  2000A at 320Vdc, one cycle
  5. Dielectric Strength:  Between open contacts:5,000Vrms;  Between contact and coil:2,200Vrms
  6. Isolation resistance (Min. at 500Vdc):  New product ≥100 MΩ; Post electrical life ≥50 MΩ
  7. Contacts resistance (at 200A): ≤60mV 
  8. Operate time (25℃):  Max close - 25ms; Max bounce – 7ms; Max release – 12ms (at 2000A)
  9. Operation environment Ambient - -40°C to +85°C; Shock (11ms 1/2 sine operating) – 20g peak;    Sine vibration 20g - 80~2,000Hz; Altitude <4000m
  10. Coil operating voltage ranges 9 – 36Vdc; 32 – 95Vdc; 48 – 95Vdc
  11. Product dimension (mm):  81 x 66 x 72
  12. Mechanical life: 1,000,000 cycles
  13. Electrical life estimation (resistive load):
  • 50A/120Vdc: 100K cycles; 50A/400Vdc: 30K cycles; 50A/900Vdc: 12K cycles
  • 250A/120Vdc: 20K cycles; 250A/400Vdc: 1,500 cycles; 250A/900Vdc: 60 cycles
  • 500A/120Vdc: 10K cycles; 500A/400Vdc: 100 cycles;  500A/900Vdc: 5 cycles
  • 750A/120Vdc: 1,800 cycles; 750A/400Vdc: 35 cycles; 750A/900Vdc: 1 cycle


Special features and benefits: ISTEK-C105 200A 750V

  • Using coil economizer, ISTEK-C105 200A 750V series of DC contactors consume 5 times less power than conventional contactors. The holding power is merely 1.7W at 12Vdc while the reversing EMF is kept at zero volts.
  • Type D has 1A form of auxiliary contacts; ISTEK-C105 200A 750V-D model effectively lowers the coil current after the contacts are closed – saves energy and reduces coil heat.
  • Type E is a non-polarized model; the non-polarized contacts for ISTEK-C105 200A 750V-E make it much easier for wiring connections.  The connection to the contacts can be made in any order or any direction – no need to worry about positive or negative side.
  • Typical EV applications: Charging for Electric Car Batteries besides often used as motor contactor for DC control.

200A 900V DC contactor with economizer and auxiliary contacts

For more technical details on this vacuum contactor and its life performances on electric car charger, refer to the product datasheet ISTEK-C105-200A-750V-DC-Contactor.

Want to know the price of this 900VDC contactor? Just contact us now.



Technical Facts of ISTEK-C104 100A 750V Motor Contactor for Industrial  Control

1.Contact form: Main contact - 1A

2.Rated operational voltage:  12Vdc to 900Vdc; Max 900Vdc

3.Contact current rating (continuous):  100A (< 175℃)

4.Break Current (max):  1250A (1/2 cycle,60Hz)

5.Dielectric Strength: 

  • Between open contacts:5,600Vrms / 8000Vdc 
  • Between contact and coil: 2,000Vrms / 4000Vdc

6. Isolation resistance (Min. at 500Vdc): 

  • New product ≥100 MΩ
  • Post electrical life ≥50 MΩ  

7. Contact Voltage Reduction (at 100A): ≤80mV   

8. Operate time (25℃): 

  • Max close - 25ms
  • Max bounce – 5ms
  • Max release – 10ms

9. Operation environment

  • Ambient - -40°C to +85°C
  • Shock (11ms 1/2 sine operating) – 20G peak
  • Sine vibration 20G - 55~2,000Hz
  • Altitude <4000m   

10. Coil operating voltage ranges:  12Vdc; 24Vdc; 48Vdc   

11. Product dimension (mm):  59 x 54 x 53   

12. Mechanical life: 1,000,000 cycles   

13. Electrical life estimation (resistive load):

  • 50A   at +400Vdc  (On / Off):   50,000 cycles
  • 100A  at +400Vdc  (On / Off):   6,000  Cycles
  • 100A  at -400Vdc  (on / Off):   1,000  Cycles
  • 200A  at +400Vdc  (On / Off):   500    Cycles
  • 1000A at +400Vdc  (Break Only): 25     Cycles
  • 600A (Make Only): 25 Cycles
100A 750V dc electrical contactor sealed with inert gas protection

For more technical details about this vacuumed high voltage DC contactor which is ideal for battery charger and as motor contactor, please refer to the detailed product datasheet of ISTEK-C104-100A-750V-DC-Contactor.



Technical Facts of ISTEK-C103 50A 750V Electrical Contactor on Lighting Control and Circuit Protection

1.Contact form: Main contact - 1A

2.Rated operational voltage:  12Vdc to 900Vdc; Max 900Vdc

3.Contact current rating (continuous):  50A (< 175℃)

4.Break Current (max):  900A (1/2 cycle,60Hz)

5.Dielectric Strength: 

  • Between open contacts:5,600Vrms / 8000Vdc 
  • Between contact and coil: 2,000Vrms / 4000Vdc

6. Isolation resistance (Min. at 500Vdc): 

  • New product ≥100 MΩ
  • Post electrical life ≥50 MΩ  

7. Contact Voltage Reduction (at 100A): ≤80mV   

8. Operate time (25℃): 

  • Max close - 25ms
  • Max bounce – 5ms
  • Max release – 10ms

9. Operation environment

  • Ambient - -40°C to +85°C
  • Shock (11ms 1/2 sine operating) – 20G peak
  • Sine vibration 20G - 55~2,000Hz
  • Altitude <4000m   

10. Coil operating voltage ranges:  12Vdc; 24Vdc; 48Vdc   

11. Product dimension (mm):  59 x 54 x 53   

12. Mechanical life: 1,000,000 cycles   

13. Electrical life estimation (resistive load):

  • 25A   at +400Vdc  (On / Off):   52,000 cycles
  • 50A  at +400Vdc  (On / Off):   6,200  Cycles
  • 50A  at -400Vdc  (on / Off):   1,100  Cycles
  • 100A  at +400Vdc  (On / Off):   600 Cycles
  • 500A at +400Vdc  (Break Only):  15 Cycles
  • 300A (Make Only): 28 Cycles

50A high voltage 750V dc contactor with magenetic blowouts

This model of electrical contactor is often used for battery charger, circuit protection, lighting control and motor contactor. For more technical details about this high voltage DC contactor or vacuum contactor, just ask us for the product datasheet of ISTEK-C103-50A-750V.




Want to find out the best price and availability for any high voltage DC contactor? Just contact us now.

Alternatively you may ask us for more information on any of these products -  being for battery charger, motor contactor or electric car charging. Our technical team will work closely with you and find a solution to properly address your requirements on electrical contactor products.



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