Phase Failure Phase Sequence PTC Protection 380V Relay

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US $11-15 / Piece | 50 Piece/Pieces Phase Failure Protection Relay (Min. Order)
Supply Ability:
100000 Piece/Pieces per Month Phase Failure Protection Relay
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Quick Details
Place of Origin:
Zhejiang, China (Mainland)
Brand Name:
Model Number:
MKC-06 Phase Failure Relay
Voltage Relay
Protect Feature:
Contact Load:
Low Power
Product name:
Phase Sequence And Phase Failure Relay
Rated voltage:
3 phase 380V and neutral 230VAC
The protection from the phase failure,phase sequence,voltage unbalance
Contact Capacity:
Electric Life:
1*1000000 time
Mechanical Life:
1*10000000 time
Main Products:
Time swith,surge arrestor,phase failure relay,timer,socket
Main Markets:
Domestic Market, Mid East, Western/Southern/Eastern Europe
Product Certifications:
VOV Certificate of Conformity,CE
Packaging & Delivery
Packaging Details
Standard exportation packing
Delivery Time
5-25 working days

Phase Failure Phase Sequence PTC Protection 380V Relay  

Product Description

1.Phase Faliure

When the monitored 3 phase voltages are valid, the output relay is activated:if any of 3 phases fails, the output device switchrs as OFF immediately. Relay LED is OFF,Asymmetry and Phase sequence error LEDs are ON.

2.Phase Sequence

when the phase sequence is correct(L1,L2,L3 in clockwise direction) the output relay is activated:however, if the sequence is changed by any reason, the output relay switches OFF immediately. Relay LED is OFF, Phase sequence error LED is ON.

3.PTC Protection(only available in MK-05p,MKC-05p,MKC-06p&MK-06p versions)

When the coiltemperature in motors exceeds TC,the limit temperature of PTC, the outputrelay switches off immediately,relay LED is OFF, this feature is included only in MK-05p,MK-06p andMKC-06p.

See following figure for typical resistance of PTC vs temperture characteristics for three different switching temperatures(110°c,120°c,130°c).Normally,PT110 is used and it can be changed upon request.

4.Voltage Unbalance(Both Unbalance and Delay Adjustable)

When the phase-phase voltage unbalance is less than the adjusted value by the user,output relay is activated. If the unbalance value exceeds the limit value(5%-15%)set by the user,out put relay is switched OFF at the end of delay time(0.1...10s)that is also set by the user.

Relay LED is OFF, asymmetry error LED is ON. If the fault disappears within the delay time, the output relay is not swithed OFF.

The voltage unbalance occurs if the phases L1,L2,L3 are loaded unequally,this case is caused by a non-uniform distribution of loads on the lines.

The voltage asymmetry causes rise in of the motor temperature and a reduction of the rated motor power.

Voltage asymmetry limit values are adjusted(5%-15%)by the user.

Hysteresis is fixed at 20%.


5.Insufficient Supply

L1 is the supplyphase of the MK-05 and MK-05P in PK21 package while.

L3 is the supply phase of MKC-05 and MKC-05p devices.For Mk and MKC devices if supply voltage fallsbelow 60-65% of rated voltage, output relay switches off without delay and error leds start to blink one after another sequentially.



1.On LED

2.Output LED

3.Phase sequence fault LED

4.Asymmery fault LED(While LED number 3and4 are On at the sametime, it means there is phases failure)

5.Contact3 normally ON connection of output relay

6.Contact2 common connection of output relay

7.contact1 normally OFF connection of output relay

8.Time adjustment(0.1sec-10sec.)

9.Asymmetry adjustment(5%-15%)

10.L1.L2.L3. phase connection

11.Neutral connection(only for 05and05p series)

12.PTC connection**:Only available in MK-05p.MKC-05p

If PTC is not used in MK-06p,MKC-06p by any reason,the PTC terminals should be short circuited.

Technical Data

Rated Voltage(un)220vac(MK-05/05p.MKC-05/05p)
3 phase+neutral 4wires connection 
120VAC(MKC-05/05P Special design)
3phase+neutra 4 wires connection
3phase 3 wires connection
440VAC(MKC-06/06P Special design)
3 phase 3 wires connection
The three phase network being protected is used as the device power supply.
Operating Range(0.9-1.1)xUn
Rated Frequency50/60Hz
Output Contacts1C/O with 8A,2000VA(for resistive load)
Asymmetry Range5%-15%:3*380VAC


Type PK10(forMk-05/05p,Mk-06/06p)type pk21(for mk-05/05p) type pk25(for mkc05/05p,mkc-06/06p)


Packaging & Shipping

Packaging Details: Standard exportation packing

Delivery Details: Within 5-25 days after your order confirmed 


Company Information

We are the experienced manufacturer of industrial electric products for years.Manhua Electric Co.,Ltd. 

It was established in 2009 and domestic business started in 1980s.
At present, our main products are timer switches, timer, relay, sockets and surge arrestors. 

This year, we have started to do more jobs on the electric products for solar and ofgrid solar powersystem.

Our products have exported to the market of Germany and USA since the year of 2005, and 

till now the products have stable growing market in Germany, Spain,USA, South America, CIS 

countries and Thailand...

We have built our divisions/agents in Chicago USA, Frankfurt Germany and Dubai.

We bring trust, comfort and benefits for our customer. Over the years, we have always done the 

humane management. Our staff has played the full role in the innovation and management. 

We have the experienced team of research and development in the electronic products.

Our Services

1. OEM service is available.  

2. Fast producing time.  

3. Cheapest price.

4. Reply promptly in 24 hours.

5. Free sample available.


Q1: Are you a Manufacture Factory?

Yes.We are the Direct Manufacture Factory, and our factory has specialized in industrial electronic products since 1980s.

Q2: Do you have stock products to sell?

No,We produce these electronic products accorded to the customer’s requirement,

It also means material, density, shape, size,design,quantity will depend on what your need.OEM 

orders always be welcomed.

Q3: Does the electronic product can  be printed  a LOGO?
Yes, we can print the logo as your requirement .

Q4: What  advantages do you have?

A: We are the direct Manufacturer in Wenzhou and could offer you the most competitive price.

B: We are the Factory, and we have the ability to carry out production schedule for punctual 


C: We could make products according to your requirments.

D: We can provide free samples for quality evaluation.

Q5: If I want to get a Quotation, what information need be provided to you?

Type, Quantity.