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    Automotive DC Solid State SwitchAutomotive DC Solid State SwitchAutomotive DC Solid State Switch
Product Details
Notes while using
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Product Details

Automotive DC Solid State Switch

  • Opto-magnetic isolation between the control signal and the output circuit.
  • LED indicates the working status.
  • Solid-state contactless output, fast switching speed, no sparks or arcing during switching.
  • Built-in over-temperature, over-current, short-circuit protection and output transient over-voltage absorption protection.
  • The metal shell and flame-retardant material are integrated to provide fire resistance, corrosion resistance, and seismic durability, ensuring stable and reliable switching.
  • The product is mainly used in new energy vehicles for medium to high power DC electrical appliances, such as PTC heaters, battery and capacitor charging and discharging, solenoid valves, motors, and other switches.
Part Numbers GQZ09
Control Voltage 12 to 15VDC or 18 to 28VDC
Control Current 80 to 90mA or 60 to 80mA
Control Indication LED indicator display
Switching Time ≤0.15ms
Load Voltage 5 to 60V, 6 to 120V, 10 to 360V, 20 to 720V
Maximum Current 30A, 50A, 60A, 80A, 100A, 120A, 150A, 180A, 200A
On-state Voltage Drop 1.0 to 4.2 VDC
Off-state Voltage 100V, 200V, 600V, 1200V
Transient Voltage Protection 80V, 180V, 480V, 1000V
Overcurrent Protection None-standard type; L: Output current reduced by 50%; Z: Output current at 100%
Main Switch Attributes MOS or IGBT transistors with solid-state contactless on/off characteristics
Auxiliary Switch Temperature control switch or NO-NC contact switch: 1A 220VAC
Isolation Voltage ≥1800 to 2500 V
Insulation Voltage ≥2000 to 2500 V
Operating Temperature -30 to 80 ℃
Cooling Conditions Equipped with a heat sink and fan for enhanced cooling
Load Current Safety Factor Resistive load: factor of 2.5 to 3 times, Inductive load: factor of 3 to 4 times of rated current
Dimensions 86×55×78mm
Notes while using
  1. The parameters provided in the datasheet are measured at standard temperature (25°C). When operating in actual conditions, a safety margin should be considered.

  2. For resistive loads:
    • Current: Select 2 to 3 times the load current.
    • Voltage: Select 2 to 3 times the load voltage.

  3. For inductive loads:
    • Current: Select 3 to 4 times the load current.
    • Voltage: Select 2 to 3 times the load voltage.

  4. Based on the relationship between load current and ambient temperature, if the ambient temperature is high or the cooling conditions are inadequate, the current capacity should be increased or the heat sink area should be enlarged.

  5. If using a solid-state relay without overcurrent protection, to prevent damage from load short-circuiting, it is required to connect a fast-acting circuit breaker in series with the load circuit or choose solid-state relays with overcurrent (GQZ09L type) or short-circuit (GQZ09Z type) protection.

  6. For inductive loads, it is necessary to parallel a freewheeling diode across the load terminals or add a varistor at the output end. The varistor should be selected based on 1 to 1.5 times the power supply voltage to prevent damage from overvoltage to the solid-state switch.

  7. During installation of the solid-state relay, it is necessary that the contact surface between the heat sink and the product is flat and clean, and a layer of thermal grease should be applied. Finally, screws with flat washers and spring washers should be symmetrically tightened to improve thermal conductivity and cooling performance.
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