Single-phase Overcurrent/Undercurrent Relay
last update: April 1, 2019
Model | Range*1 | Connection
terminals |
Setting
range |
Input
impedance |
Input type | Overload capacity |
---|---|---|---|---|---|---|
K8AK-AW1 | 0 to 20 mA
AC/DC |
I1-COM | 2 to 20 mA
AC/DC 10 to 100 mA AC/DC 50 to 500 mA AC/DC |
Approx. 5 Ω | Direct input | Continuous input at
120% of maximum input. 1 s at 150% |
0 to 100 mA
AC/DC |
I2-COM | Approx. 1 Ω | Direct input | |||
0 to 500 mA
AC/DC |
I3-COM | Approx. 0.2 Ω | Direct input | |||
K8AK-AW2 | 0 to 1 A
AC/DC |
I1-COM | 0.1 to 1 A
AC/DC 0.5 to 5 A AC/DC |
Approx. 0.12 Ω
(Load: 0.5 VA) |
Direct input
or commercially available CT |
|
0 to 5 A
AC/DC |
I2-COM | Approx. 0.02 Ω
(Load: 1.5 VA) |
||||
K8AK-AW3 | 0 to 100 A
AC |
I2-COM | - | OMRON CT | Continuous input at
120% with an OMRON CT (K8AC-CT200L). 30 s at 200% 1 s at 600% * CT capacity on primary side. |
|
0 to 200 A
AC |
I3-COM | 10 to 100 A
AC*2 20 to 200 A AC*2 |
- | OMRON CT |
*1 The range is selected using connected terminals.
*2 The K8AK-AW3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)
Power supply
voltage |
Isolated power supply | 24 VAC/DC
100 to 240 VAC |
---|---|---|
Power consumption | 24 VAC/DC: 2.0 VA/1.1 W max.
100 to 240 VAC: 4.6 VA max. |
|
Operating value setting range (SV) | 10% to 100% of the maximum value of the setting range
K8AK-AW1: 2 to 20 mA AC/DC 10 to 100 mA AC/DC 50 to 500 mA AC/DC K8AK-AW2: 0.1 to 1 A AC/DC (Compatible with commercially available CTs.) 0.5 to 5 A AC/DC (Compatible with commercially available CTs.) K8AK-AW3: When used with the OMRON CT (K8AC-CT200L). 10 to 100 A AC 20 to 200 A AC |
|
Operating value | 100% operation at set value | |
Reset value | 5% of operating value (fixed) | |
Reset method | Manual reset/automatic reset (switchable)
Note: Manual reset: Turn OFF power supply for 1 s or longer. |
|
Operating time setting range (T) | 0.1 to 30 s | |
Startup lock time setting range
(LOCK) Note: Enabled only for overcurrent operation. |
0 to 30 s
(The startup lock timer starts when the input has reached approximately 30% or more of the set value.) Note: Enabled only for overcurrent operation. |
|
Indicators | Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red | |
Input impedance | Refer to Input Range on previous page. | |
Output relays | Two SPDT relay outputs (normally closed operation) | |
Output relay ratings | Rated load
Resistive load 5 A at 250 VAC 5 A at 30 VDC Maximum switching capacity: 1,250 VA, 150 W Minimum load: 5 VDC, 10 mA (reference values) Mechanical life: 10 million operations min. Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations 3 A at 250 VAC/30 VDC: 100,000 operations |
|
Ambient operating temperature | -20 to 60°C (with no condensation or icing) | |
Storage temperature | -25 to 65°C (with no condensation or icing) | |
Ambient operating humidity | 25% to 85% (with no condensation) | |
Storage humidity | 25% to 85% (with no condensation) | |
Altitude | 2,000 m max. | |
Terminal screw tightening torque | 0.49 to 0.59 N·m | |
Terminal wiring method | Recommended wire
Solid wire: 2.5 mm2 Twisted wires: AWG16, AWG18 Note: 1. Ferrules with insulating sleeves must be used with twisted wires. Note: 2. Two wires can be twisted together. Recommended ferrules Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact Al 1-8RD (for AWG18) manufactured by Phoenix Contact Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact |
|
Case color | N1.5 | |
Case material | PC and ABS, UL 94 V-0 | |
Weight | Approx. 150 g | |
Mounting | Mounts to DIN Track. | |
Dimensions | 22.5 × 90 × 100 mm (W×H×D) |
Allowable operating voltage
range |
85% to 110% of power supply voltage | |
---|---|---|
Allowable operating frequency
range |
50/60 Hz ±5 Hz | |
Input frequency range | K8AK-AW1 and K8AK-AW2: DC input or AC input (45 to 65 Hz)
K8AK-AW3: AC input (45 to 65 Hz) |
|
Overload capacity | K8AK-AW1 and K8AK-AW2: Continuous input at 120% of maximum input, 1 s at 150%
K8AK-AW3: Continuous input at 120%, 30 s at 200%, and 1 s at 600% with an OMRON CT (K8AC-CT200L). Note: CT capacity on primary side. |
|
Repeat
accuracy |
Operating value | ±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, DC or 50/60
Hz sine wave input) |
Operating time | ±50 ms (at 25°C and 65% humidity, rated power supply voltage) | |
Applicable
standards |
Conforming
standards |
EN 60947-5-1
Installation environment (pollution level 2, installation category III) |
EMC | EN 60947-5-1 | |
Safety standards | UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14,
CCC: GB/T 14048.5 |
|
Insulation resistance | 20 MΩ min.
Between external terminals and case Between power supply terminals and input terminals Between power supply terminals and output terminals Between input terminals and output terminals |
|
Dielectric strength | 2,000 VAC for one minute
Between external terminals and case Between power supply terminals and input terminals Between power supply terminals and output terminals Between input terminals and output terminals |
|
Noise immunity | 1,500 V power supply terminal common/normal mode
Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time |
|
Vibration resistance | Frequency: 10 to 55 Hz, 0.35-mm single amplitude
10 sweeps of 5 min each in X,Y, and Z directions |
|
Shock resistance | 100 m/s2, 3 times each in 6 directions along 3 axes | |
Degree of protection | Terminals: IP20 |
The following diagram shows the relationship between the mounting distances and the input current.
If the relay is used with an input current that exceeds these values, the temperature of the K8AK may rise and shorten the life of the internal components.
last update: April 1, 2019