Single phase SSR


2W 380VAC 40A Solid State Relay SSR Voltage Regulator

2W 380VAC 40A Solid State Relay SSR voltage regulator Product Description Introduction: Solid state relay (SSR) is an electronic switching device that switches states when an external voltage is ap

2W 380VAC 40A Solid State Relay SSR voltage regulator


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.


  • Dielectric strength 4000V

  • Photo isolation

  • Zero cross or random turn-on

  • Removable finger proof cover available

  • Double SCR AC output

  • Panel mount

  • DC or AC control

  • Built-in RC


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)



Loda voltage  Control Signal  Rated current
10A 25A 40A
380V AC  4-20mA NKDH1038LA NKDH2538LA NKDH4038LA
220~560KΩM NKDH1038VA NKDH2538VA NKDH4038VA


Loda voltage  Control Signal  Rated current
60A 80A 100A 120A
380V AC  4-20mA NKDH6038LA NKDH8038LA NKDH10038LA NKDH12038LA
0~10V DC NKDH6038VD NKDH8038VD NKDH10038VD NKDH12038VD
220~560KΩM NKDH6038VA NKDH8038VA NKDH1008VA NKDH12038VA

Technical specifications:

Model NKDHxxxxxLA NKDHxxxxxVD NKDHxxxxxVA
Load voltage 24-480VAC
Load signal 4-20mA 0-10V DC 470~560KΩM/2W
Leakage current(off-state) ≤5mA
Peak voltage  1000V AC 
Voltage drop ≤1.6V AC
Switching time ≤10mS
LED indication no
Dielectric strength 2500V AC (1min)
Insulation resistance 500MΩ with 500V DC
Operating temperature -30°c ~ +75°c
Relative Humidity ≤95%(non-condensing)
Dimensions 57.4x44.8x32mm
Mounting method Screws on
Weight ≤135g

Outline dimensions & Wiring diagram:


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

Contact us

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

Tel: +86 577 61787391               Fax:+86 577 61787392


Mobile/WeChat/WhatsApp:+86-139 6878 5810               E-mail:sales at

Thank you & Now send your kindly inquiry below, please!