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New Product

Single-phase Overvoltage/Undervoltage Relay

K8DT-VW

Detect abnormal voltages applies to equipment to 
protect against equipment failure.
Monitor for overvoltages and undervoltages 
simultaneously with one Relay.

• Monitor AC or DC voltages with one Relay.
• Settings for the operating value, hysteresis, and operating time.
• Width of 17.5 mm to reduce space required in panels.
• Push-In Plus Terminal that reduce wiring work.

The use of cage clamps enables wiring with bare stranded wires.
Double-insertion holes for crossover wiring (all terminals).

• UL listed for easy shipping to North America.
• Models added with transistor outputs for superior contact reliability.

Ordering Information

Single-phase Overvoltage/Undervoltage Relay

Options (Order Separately)
Front Cover

Ratings and Specifications

Input Range

*

The range is selected using connected terminals.

Refer to 

Safety Precautions

 on page 8.

Refer to page 7 for commonly asked questions.

Setting range

Power supply voltage

Output

Model

1 to 10 V AC/DC
3 to 30 V AC/DC

15 to 150 V AC/DC

24 VAC/DC

Relay: SPDT contact output

K8DT-VW2CD

Transistor

K8DT-VW2TD

100 to 240 VAC

Relay: SPDT contact output

K8DT-VW2CA

Transistor

K8DT-VW2TA

20 to 200 V AC/DC
30 to 300 V AC/DC
60 to 600 V AC/DC

24 VAC/DC

Relay: SPDT contact output

K8DT-VW3CD

Transistor

K8DT-VW3TD

100 to 240 VAC

Relay: SPDT contact output

K8DT-VW3CA

Transistor

K8DT-VW3TA

For the most recent information on models 
that have been certified for safety 
standards, refer to your OMRON website.

Appearance

Model

Y92A-D1A

Model

Range 

*

Connection terminal

Setting range

Input impedance

Overload capacity

K8AK-VW2

@@

0 to 10 V AC/DC

V1-COM

1 to 10 V AC/DC

Approx. 120 k

Ω 

Continuous input at 115% of 
maximum input.
10 s at 125%
(up to 600 VAC)

0 to 30 V AC/DC

V2-COM

3 to 30 V AC/DC

Approx. 320 k

Ω

 

0 to 150 V AC/DC

V3-COM

15 to 150 V AC/DC

Approx. 1.6 M

Ω

K8AK-VW3

@@

0 to 200 V AC/DC

V1-COM

20 to 200 V AC/DC

Approx. 1.2 M

Ω

0 to 300 V AC/DC

V2-COM

30 to 300 V AC/DC

Approx. 1.7 M

Ω

0 to 600 V AC/DC

V3-COM

60 to 600 V AC/DC

Approx. 3.1 M

Ω

Summary of Contents for K8DT-VW

Page 1: ... for commonly asked questions Setting range Power supply voltage Output Model 1 to 10 V AC DC 3 to 30 V AC DC 15 to 150 V AC DC 24 VAC DC Relay SPDT contact output K8DT VW2CD Transistor K8DT VW2TD 100 to 240 VAC Relay SPDT contact output K8DT VW2CA Transistor K8DT VW2TA 20 to 200 V AC DC 30 to 300 V AC DC 60 to 600 V AC DC 24 VAC DC Relay SPDT contact output K8DT VW3CD Transistor K8DT VW3TD 100 to...

Page 2: ...8 mm Ferrule length 8 mm Recommended flat blade screwdriver XW4Z 00B Omron SZF 0 4 2 5 Phoenix Contact 210 719 Wago SDI 0 4 2 5 75 Weidmuller Current capacity 10 A per pole Number of insertions 50 times Case color N1 5 Case material PC UL 94 V 0 Weight Approx 100 g Mounting Mounts to DIN Track or screw mounting Dimensions 17 5 90 90 mm W H D Allowable operating voltage range 85 to 110 of rated pow...

Page 3: ... Output Note Use copper wires with a rating of 75 C or an equivalent rating Inside Inside 2 Output C Relay Output T Transistor Output 3 Power Supply Voltage A 100 to 240 VAC D 24 VAC DC No polarity 14 11 12 A1 A2 A1 A2 14 11 1 Voltage Input VW2 10V max 30V max 150V max VW3 200V max 300V max 600V max A1 V2 V1 14 A2 V3 11 12 C K8DT VW2 C A 1 2 3 V2 V1 V3 C V2 V1 V3 C DIP SW DIP SW Single phase power...

Page 4: ... voltage t Operating time 0 1 to 30 s t1 t1 Power ON lock 1 s or 5 s t t Operating time 0 1 to 30 s Delay time 250 ms reference value t Operating time 0 1 to 30 s Flashing Lit Flashing Lit Hysteresis Fixed at 5 Hysteresis Fixed at 5 AL1 alarm indicator AL2 alarm indicator Contacts 11 14 or transistor output Overvoltage setting AL2 Overvoltage setting AL1 Input Power supply voltage t1 Power ON lock...

Page 5: ...he Unit Note Open the DIP switch cover to set the DIP switch Keep the DIP switch cover closed while the power supply to the Relay is ON Model Setting range Wiring connection K8DT VW2 1 to 10 V AC DC V1 COM 3 to 30 V AC DC V2 COM 15 to 150 V AC DC V3 COM K8DT VW3 20 to 200 V AC DC V1 COM 30 to 300 V AC DC V2 COM 60 to 600 V AC DC V3 COM A1 A2 Power supply voltage Voltage input Single phase power C ...

Page 6: ...imum setting range will be 600 VAC VDC and the setting range will be 60 to 600 V Operating Time The operating time is set using the operating time knob T The operating time can be set to between 0 1 and 30 s If the input exceeds or drops lower than the voltage set value the alarm indicator will start flashing for the set period and then stay lit Dimensions Unit mm Optional Parts for DIN Track Moun...

Page 7: ... How to Measure the Operating Time Overvoltage Change the input suddenly from 0 to 120 of the set value and measure the time until the Unit operates Undervoltage Change the input suddenly from 120 to 0 of the set value and measure the time until the Unit operates Questions and Answers Q Input voltage Set value Alarm indicator Flashing 5 s Lit Contact output or transistor output V 200 VAC A1 Input ...

Page 8: ... alarm outputs may fail to operate This may result in physical damage to the facilities equipment or other devices that are connected to it To reduce this risk inspect the Relay regularly To maintain safety in the event of malfunction of the Relay take appropriate safety measures such as installing a monitoring device on a separate line If the wire insertion length is insufficient fire may occasio...

Page 9: ...o operation check the wiring before you supply power to the product 22 Do not install the product immediately next to heat sources 23 Perform periodic maintenance 24 Do not wire anything to the release holes 25 Do not tilt or twist a flat blade screwdriver while it is inserted into a release hole on the terminal block The terminal block may be damaged 26 Insert a flat blade screwdriver into the re...

Page 10: ...ove the flat blade screwdriver from the release hole Checking Connections After the insertion pull gently on the wire to make sure that it will not come off and the wire is securely fastened to the terminal block If you use a ferrule with a conductor length of 10 mm part of the conductor may be visible after the ferrule is inserted into the terminal block but the product insulation distance will s...

Page 11: ...on and other factors There is basic insulation between the power supply terminals and input terminals There is basic insulation between the power supply terminals and output terminals There is basic insulation between the input terminals and output terminals Operating section must have reinforced or double insulation The sides of the case are not isolated Connect the output contacts contacts with ...

Page 12: ...MEMO 12 ...

Page 13: ... CONNECTED WITH THE PRODUCTS WHETHER SUCH CLAIM IS BASED IN CONTRACT WARRANTY NEGLIGENCE OR STRICT LIABILITY Further in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted Suitability of Use Omron Companies shall not be responsible for conformity with any standards codes or regulations which apply to the combination of the Product i...

Page 14: ...69 U S A Tel 1 847 843 7900 Fax 1 847 843 7787 Regional Headquarters OMRON EUROPE B V Wegalaan 67 69 2132 JD Hoofddorp The Netherlands Tel 31 2356 81 300 Fax 31 2356 81 388 Contact www ia omron com Kyoto JAPAN OMRON ASIA PACIFIC PTE LTD No 438A Alexandra Road 05 05 08 Lobby 2 Alexandra Technopark Singapore 119967 Tel 65 6835 3011 Fax 65 6835 2711 OMRON CHINA CO LTD Room 2211 Bank of China Tower 20...

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