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NK9991 NKDH4023DD3 50A DC DC Single Phase SSR solid state relay

NKDH4023DD3 40A 220VDC 32VDC DC/DC Single Phase SSR solid state relay Product Description Introduction: Solid state relay (SSR) is an electronic switching device that switches states when an exter

NKDH4023DD3 40A 220VDC 32VDC DC/DC

Single Phase SSR solid state relay

Product Description


Solid state relay (SSR) is an electronic switching device that switches states when an external voltage is applied along its n-type and p-type junctions. SSR has a small control signal that controls a larger load current or voltage. It consists of a sensor which responds to an appropriate input (control signal), a solid-state electronic switching device which switches power to the load circuitry, and some coupling mechanism to enable the control signal to activate this switch without mechanical parts. The relay may be designed to switch either AC or DC to the load. It serves the same function as an electromechanical relay, but has no moving parts.


  • DC control voltage 3~32Vdc
  • MOSFET output
  • Photo isolation
  • Dielectric strength 2500V
  • Long service life
  • Panel mount
  • There isn’t contact bounce and sparks during switching
  • Low power consumption


Models explanation:



           1             2         3       4

1.NK – Code
NKDH – single-phase solid state relay (10 – 120A)
NKDM – industrial class solid state relay (100 – 500A)
NKTH – three-phase solid state relay (10 – 120A)
NKTR – motor reversing solid state relay (10 – 40A)
2.40 – load current 40A (10 – 500A)
3.48 – load voltage 24-480V AC, 38 – 24-380V AC, 23 – 5-220V DC
4.ZD3 – control signal type(swithing mode)
VA – variable resistor 220-560 /2 (phase control)
LA – analog signal 4-20mA (phase control)
VD – analog signal 0-10V DC (phase control)
ZD – control voltage 10-30V DC (switching at zero crossing)
ZD3 – control voltage 3-32V DC (switching at zero crossing)
ZA2 – control voltagte 70-280V AC (switching at zero crossing)
DD3 – control voltage 3-32V DC (DC voltage switching)



Load voltage Control voltage Rated current
10A 25A 40A 60A
220VDC 3-32 VDC NKDH1023DD3 NKDH2548DD3 NKDH4048DD3 NKDH6048DD3


Load voltage Control voltage Rated current
80A 100A 120A 200A
220VDC 3-32 VDC NKDH8023DD3 NKDH10048DD3 NKDH12048DD3 NKDH20048DD3


Single phase DC-DC Solid State Relay SSR


Model NKDH4023DD3
Load current 40
Load voltage 24-220VDC
Control voltage 3-32VDC
Control current DC5-25mA
On state voltage drop ≤2.3V
On state leakage current ≤2mA
Off state time ≤10mS
Dielectric strength 2000VAC
Insulation resistance 1000MΩ500VDC
Ambient temperature -30°c ~ 75°c
Mounting method bolting
Indicator LED
Weight 135g


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Q:How to order our product ? 

A:1).Please tell us the model and quantity and other request you need. 

   2).We make the PI for you.

   3).After you confirm the PI, we arrange the order for you after receiving your payment.

   4).After the goods finished, we send the goods out to you and tell you the tracking number.

   5).We will track your goods until you receive the goods. 

Q:  What's your warranty ?

A: 1-2 years

Q: What's your contact information:

A: Our address: Liushi town, Zhejiang province, China. 

Q: What's your shipment method?

A: We ship by Express, by air, by sea, by train. Normally we checked and compare, then provide

customer the most proper shipment method.

Q: What's about MOQ?

A: First order MOQ=1pcs

Q: If i want to release order, what's the payment method you accept ?

A: We accept T/T, Paypal, Western union, L/C,etc.

Q: If i want to release order, what's the process?

A: Thanks. You can send inquiry to us by alibaba, or send us by email, we will reply within 24hrs.

Our Services

1. Your inquiry will be replied within 18 hours.
2. We offer you professional service in fluent English.
3. Keep the mass production as the sample in high quality.
4. Freight forwarder: faster,safer, and convenient.
5. Quality: we have QC on each process.

Company Information

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Contact us

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ADD: NO..18 QunYing Road, Xingguang Industrial Zone, liushi, Yueqing City, Zhejiang, China

Tel: +86 577 61787391               Fax:+86 577 61787392            Sky-pe: NQQK ELC

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E-mail:sales at

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