High Performance Big Current DC Contactors



DC contactors from ISTEK are manufactured by Quanying Electronics - a subsidiary factory with over 40 years history under Aerospace Corporation in China. Quanying is the most outstanding contactor developer and producer among all of the relay contactor manufacturers in China.

Thanks to the very strong R & D team and the modern advanced testing laboratories, the DC contactor relays are designed to have the best switching performances. They are UL and 3C certified and ROHS compliant.

There are mainly two categories of DC contactors supplied from ISTEK: HTLW big current series which can switch over 600A current and ISTEK high voltage series which can break up to 900Vdc

The big current DC Contactor relay series include both electromagnetic type and magnetic latching type. They are currently available to the international clients outside China. The contact form can be either Normally Open (NO) or Normally Close (NC). They have very good switching speed with pick-up time under 35ms and releasing time under 20ms.


Electromagnetic DC Contactor Relay Series
(100A, 200A, 400A and 600A)

These DC Contactors are electromagnetic type - coils are energised continuously to maintain the contact operational status. Customers can choose the coil voltage to be 24Vdc, 48Vdc or 60Vdc. Under the rated load condition, the DC contactor relays have low coil heat and contact temperature rise - which ensure the longer operation life.


Normally Open (NO) DC Contactors:

1). 200A DC Contactor Relay: ISTEK-C111-200H S/D

  • Maximum Switching Power (Rated Load): 23,000VA
  • Maximum Switching Current: 300A at 77Vdc; 200A at 115Vdc; 100A at 230Vdc
  • Contact Form: 1a
  • Contact Resistance: initial value ≤50(mΩ), post life test ≤200(mΩ)
  • Insulation resistance: cold state ≥20 MΩ, hot state ≥2 MΩ, post life test under high humidity ≥10(mΩ)
  • Dielectric Strength: 1,500V (rsm, 50Hz under normal pressure)
  • Contact Load and Corresponding Operation Life:
      -200A / 48Vdc: 6,000 times
      -200A / 115Vac / 400Hz: 6,000 times
      -100A / 220Vac / 50Hz: 6,000 times
  • Ambient Temperature: -40°C to +60°C
  • Dimensions: 91 x 86 x 56
  • Optional Feature: auxiliary switches
  • Contactor Applications: any case needs high current switch - e.g. generator, motor starter, industrial battery charger, electrical remote control, electric car charger etc...

200A DC Contactor 12Vdc,24VDC,48VDC or 60VDC Normally Open Contacts

ISTEK-C111-200H Normally Open: Want to know the price of this DC Contactor 200a? Please Contact Us for more technical details of this contactor relay.




2). 400A DC Contactor Relay: ISTEK-C112-400H S/D


  • Maximum Switching Power (Rated Load): 46,000VA
  • Maximum Switching Current: 500A/92Vdc; 400A/115Vdc; 300A/153Vdc; 250A/184Vdc; 200A/230Vdc
  • Contact Form: 1b
  • Contact Resistance: initial value ≤20(mΩ), post life test ≤200(mΩ)
  • Insulation resistance: cold state ≥20 MΩ, hot state ≥2MΩ, post life test under high humidity ≥10(mΩ)
  • Dielectric Strength: 1,500V (rsm, 50Hz under normal pressure)
  • Contact Load and Corresponding Operation Life:
      -400A / 48Vdc: 6,000 times
      -400A / 115Vac / 400Hz: 6,000 times
      -200A / 220Vac / 50Hz: 6,000 times
  • Ambient Temperature: -40°C to +70°C
  • Dimensions: 108 x 104 x 66
  • Optional Feature: auxiliary switches
  • Contactor Applications: any case needs high current switch - e.g. generator, motor starter, industrial battery charger, electrical remote control, electric car charger etc...

400A DC Contactor Relay 12Vdc, 24Vdc, 48Vdc or 60Vdc Normally Open

ISTEK-C112-400H Normally Open: Just want to know the price of this high current DC Contactor Relay? Please Contact Us. For more technical details of this DC contactor relay, you may ask us for the product datasheets.





Normally Close (NC) DC Contactors:


1). 200A DC Contactor Relay: ISTEK-C111-200B

  • Maximum Switching Power (Rated Load): 23,000VA
  • Maximum Switching Current: 300A at 77Vdc; 200A at 115Vdc; 100A at 230Vdc
  • Contact Form: 1b
  • Contact Resistance: initial value ≤50(mΩ), post life test ≤200(mΩ)
  • Insulation resistance: cold state ≥20 MΩ, hot state ≥2 MΩ, post life test under high humidity ≥10(mΩ)
  • Dielectric Strength: 1,500V (rsm, 50Hz under normal pressure)
  • Contact Load and Corresponding Operation Life:
      -200A / 48Vdc: 6,000 times
      -200A / 115Vac / 400Hz: 6,000 times
      -100A / 220Vac / 50Hz: 6,000 times
  • Ambient Temperature: -40°C to +60°C
  • Dimensions: 91 x 86 x 56
  • Optional Feature: auxiliary switches
  • Contactor Applications: any case needs high current switch - e.g. generator, motor starter, industrial battery charger, electrical remote control, electric car charger etc...


200A DC Contactor Relay - Normally Close 24VDC or 48VDC or 60VDC

ISTEK-C111-200B: Want to know the price of this DC Contactor 200a product? Please Contact Us. For more technical details of this contactor relay, refer to its datasheet: DC-Contactor-C111-200B



2). 400A DC Contactor Relay: ISTEK-C112-400B

  • Maximum Switching Power (Rated Load): 46,000VA
  • Maximum Switching Current: 500A/92Vdc; 400A/115Vdc; 300A/153Vdc; 250A/184Vdc; 200A/230Vdc
  • Contact Form: 1b
  • Contact Resistance: initial value ≤20(mΩ), post life test ≤200(mΩ)
  • Insulation resistance: cold state ≥20 MΩ, hot state ≥2MΩ, post life test under high humidity ≥10(mΩ)
  • Dielectric Strength: 1,500V (rsm, 50Hz under normal pressure)
  • Contact Load and Corresponding Operation Life:
      -400A / 48Vdc: 6,000 times
      -400A / 115Vac / 400Hz: 6,000 times
      -200A / 220Vac / 50Hz: 6,000 times
  • Ambient Temperature: -40°C to +70°C
  • Dimensions: 108 x 104 x 66
  • Optional Feature: auxiliary switches
  • Contactor Applications: any case needs high current switch - e.g. generator, motor starter, industrial battery charger, electrical remote control, electric car charger etc...


400A DC Contactor - Normally Close 12VDC or 24VDC or 48VDC or 60VDC

ISTEK-C112-400B: Just want to know the price of this high current DC Contactor Relay? Please Contact Us. For more technical details of this contactor, refer to its datasheet: DC-Contactor-C112-400B

In the meantime, our electromagnetic type series also include 100A model (ISTEK-C110-100H NO and ISTEK-C110-100B NC) and other contact ratings (50A and 600A).




Magnetic Latching type of DC Contactors

Besides the above electromagnetic type of big current contactors, the magnetic latching type of DC Contactors are also available to our international customers.

This type of contactors are extremely energy efficient. They have no power consumption to maintain contact switching state. This series of low voltage latching contactor series include:

1). ISTEK-JMQ100 Low Voltage Latching DC Contactor : Rated load of the main contact: 100A and 48Vdc

2). ISTEK-JMQ200 Low Voltage Latching DC Contactor : Rated load of the main contact: 200A and 48Vdc

3). ISTEK-JMQ400 Low Voltage Latching DC Contactor : Rated load of the main contact: 400A and 48Vdc


For more technical details and price information of these bistable DC contactors, please Contact Us.



Still can not find the DC contactors matching exactly with your requirements?  Simply tell us (using the below form) what your needs are, our technical team can work with you and develop a solution.


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