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.
For the most recent information on models
that have been certified for safety
Refer to Safety Precautions on page 8.
standards, refer to your OMRON website.
Refer to page 7 for commonly asked questions.
Ordering Information
Single-phase Overvoltage/Undervoltage Relay
Setting range Power supply voltage Output Model
Relay: SPDT contact output K8DT-VW2CD
24 VAC/DC
1 to 10 V AC/DC
Transistor K8DT-VW2TD
3 to 30 V AC/DC
Relay: SPDT contact output K8DT-VW2CA
15 to 150 V AC/DC
100 to 240 VAC
Transistor K8DT-VW2TA
Relay: SPDT contact output K8DT-VW3CD
24 VAC/DC
20 to 200 V AC/DC
Transistor K8DT-VW3TD
30 to 300 V AC/DC
Relay: SPDT contact output K8DT-VW3CA
60 to 600 V AC/DC
100 to 240 VAC
Transistor K8DT-VW3TA
Options (Order Separately)
Front Cover
Appearance Model
Y92A-D1A
Ratings and Specifications
Input Range
Model Range * Connection terminal Setting range Input impedance Overload capacity
0 to 10 V AC/DC V1-COM 1 to 10 V AC/DC Approx. 120 k
K8AK-VW2@@ 0 to 30 V AC/DC V2-COM 3 to 30 V AC/DC Approx. 320 k
Continuous input at 115% of
0 to 150 V AC/DC V3-COM 15 to 150 V AC/DC Approx. 1.6 M
maximum input.
10 s at 125%
0 to 200 V AC/DC V1-COM 20 to 200 V AC/DC Approx. 1.2 M
(up to 600 VAC)
K8AK-VW3@@ 0 to 300 V AC/DC V2-COM 30 to 300 V AC/DC Approx. 1.7 M
0 to 600 V AC/DC V3-COM 60 to 600 V AC/DC Approx. 3.1 M
* The range is selected using connected terminals.
1K8DT-VW
Ratings
Specifications
Power supply K8DT-VW@@D: 24 VAC 50/60 Hz, 24 VDC
Allowable operating
85% to 110% of rated power supply voltage
voltage K8DT-VW@@A: 100 to 240 VAC 50/60 Hz
voltage range
24 VAC/DC: 1.8 VA/1 W max.
Allowable operating
Power consumption
50/60 Hz 5 Hz
100 to 240 VAC: 2.5 VA max.
frequency range
Rated insulation
Input frequency range 40 to 500 Hz
600 VAC
voltage
Continuous input at 115% of maximum input, 10
Overload capacity
10% to 100% of the maximum value of the setting
s at 125% (up to 600 VAC).
range
Operating 0.5% full scale (at 25 C and 65% humidity, rated
K8DT-VW2: 1 to 10 V AC/DC
value power supply voltage)
Operating value setting 3 to 30 V AC/DC
Repeat
range (AL1 and AL2) 15 to 150 V AC/DC
accuracy
Operating 50 ms (at 25 C and 65% humidity, rated power
K8DT-VW3: 20 to 200 V AC/DC
time supply voltage)
30 to 300 V AC/DC
60 to 600 V AC/DC EN 60947-5-1
Conforming
Installation environment (pollution level 2,
standards
Operating value 100% operation at set value
Overvoltage category III)
Applicable
Reset value 5% of operating value (fixed)
standards EMC EN 60947-5-1
Manual reset/automatic reset (switchable)
Safety UL 60947-5-1 (Listing), Korean Radio Waves Act
Reset method Manual reset: Turn OFF power supply for 1 s or
standards (Act 10564), CCC (GB14048.5)
longer.
20 M : min.
Operating time
Between all external terminals and the case
0.1 to 30 s
setting range (T)
Between all power supply terminals and all
input terminals
Power ON lock time 1 s or 5 s (Switched using DIP switch.)
Insulation resistance
Between all power supply terminals and all
Power (PWR): Green, Relay output (RY): Yellow,
output terminals
Indicators Alarm output1 (AL1): Red,
Between all input terminals and all output
Alarm output2 (AL2): Red
terminals
Input impedance Refer to Input Range on page 1.
2,000 VAC for 1 min
Between all external terminals and the case
Relay Output: SPDT contact
Output form
Between all power supply terminals and all
Transistor Output: 1
input terminals
Dielectric strength
Rated load
Between all power supply terminals and all
5 A at 250 VAC (Resistive load)
output terminals
5 A at 30 VDC (Resistive load)
Between all input terminals and all output
1 A at 250 VAC (Inductive load)
terminals
0.2 A at 48 VDC (Inductive load)
Impulse withstand 6 kV (between live terminals and exposed,
Output relay ratings Minimum load: 5 VDC, 10 mA (reference values)
voltage non-charged metal parts)
Mechanical life: 10 million operations min.
Electrical life: 5 A at 250 VAC or 30 VDC: 50,000
Square-wave noise of 1 P s/100-ns pulse width
operations
with 1-ns rise time
3 A at 250 VAC or 30 VDC: 100,000
100 to 240 VAC: 1,500 V power supply terminal
operations
Noise immunity common/normal mode
24 VAC: 1,500 V power supply terminal common/
Transistor output Rated voltage: 24 VDC (maximum voltage: 26.4 VDC)
normal mode
ratings Maximum current: 50 mA DC
24 VDC: 480 V power supply terminal common
Ambient operating
20 to 60C (with no condensation or icing)
Frequency: 10 to 55 Hz, 0.35-mm single
temperature
Vibration resistance amplitude
Storage temperature 25 to 65C (with no condensation or icing)
10 sweeps of 5 min each in X,Y, and Z directions
2
Ambient operating
100 m/s , 3 times each in 6 directions along 3
25% to 85% RH (with no condensation)
Shock resistance
humidity
axes
Storage humidity 25% to 85% RH (with no condensation)
Degree of protection Terminals: IP20
Altitude 2,000 m max.
Applicable wires Stranded wires, solid wires, or ferrules
2
Applicable wire size 0.25 to 1.5 mm (AWG24 to AWG16)
Wire insertion force 8 N max. for AWG20 wire
Screwdriver
15 N max.
insertion force
Wire stripping length 8 mm
Ferrule length 8 mm
XW4Z-00B (Omron)
Recommended flat- SZF 0.4 2.5 (Phoenix Contact)
blade screwdriver 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)
2