OMRON K8AK-PA lineup

last update: April 01, 2014

Rated input*		Model
3-phase 3-wire mode	200, 220, 230, 240 VAC	K8AK-PA1
3-phase 4-wire mode	115, 127, 133, 138 VAC
3-phase 3-wire mode	380, 400, 415, 480 VAC	K8AK-PA2
3-phase 4-wire mode	220, 230, 240, 277 VAC

Note: Three-phase, three-wire or four-wire and the input range are switched using a DIP switch.
* The power supply voltage is the same as the rated input voltage.

last update: April 01, 2014

OMRON K8AK-PA dimension

last update: April 01, 2014

Three-phase Asymmetry and Phase-sequence Phase-loss Relays

K8AK-PA1
K8AK-PA2

Optional Parts for DIN Track Mounting

DIN Tracks
PFP-100N
PFP-50N

*Dimensions in parentheses are for the PFP-50N.

last update: April 01, 2014

OMRON K8AK-PA specification

last update: April 3, 2017

Ratings

Rated input voltage	K8AK-PA1	Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC
	K8AK-PA2	Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC
Input load		K8AK-PA1: Approx. 4.4 VA K8AK-PA2: Approx. 4.4 VA
Operating value setting range (ASY.)		Asymmetry set value: 2% to 22%
Operating value		Asymmetry operating value = Rated input voltage × Asymmetry set value (%) The asymmetry operation will function when the potential difference between the highest and lowest voltage phases equals or exceeds the asymmetry operating value.
Reset value setting range (HYS.)		5% of operating value (fixed)
Reset method		Automatic reset
Operating time setting range (T)	Asymmetry	0.1 to 30 s
	Phase sequence	0.1 s±0.05 s
	Phase loss	0.1 s max.
Power ON lock time (LOCK)		1 s/5 s (Changed with the DIP switch.)
Indicators		Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red
Output relays		One SPDT relay (NC 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. 　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. 130 g
Mounting		Mounts to DIN Track.
Dimensions		22.5 × 90 × 100 mm (W×H×D)

Specifications

Input frequency		50/60 Hz
Overload capacity		Continuous input at 115% of maximum input, 10 s at 125% (up to 600 VAC).
Repeat accuracy	Operating value	±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, 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: GB14048.5
Insulation resistance		20 MΩ min. Between external terminals and case Between input terminals and output terminals
Dielectric strength		2,000 VAC for one minute Between external terminals and case 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

Relationship of Mounting Distance between K8AK-PA Relays and Ambient Temperature (Reference Values)

The following diagram shows the relationship between the mounting distances and the ambient temperature.
If the relay is used with an ambient temperature that exceeds these values, the temperature of the K8AK may rise and shorten the life of the internal components.

last update: April 3, 2017

OMRON K8AK-PA catalog

• Catalog
• CAD

English

Global Edition

For ordering in Singapore, please note some product models not sold in Singapore may be included in the following catalog(s) for our global customers.

*It is recommended to select “Save” from the right-click due to large size of catalog PDF data.

Catalog Name	Catalog Number [size]	Last Update
K8AK-PA Catalog	N186-E1-01 [1061KB]	Apr 03, 201720170403	K8AK-PA Catalog
Measuring and Monitoring Relays Application Guide	N222-E1-01 [1649KB]	Jun 01, 201820180601	Measuring and Monitoring Relays Application Guide

• NO. K8AK-PA
• TYPE:Measuring / Motor Protective Relays Component Protective Components Measuring & Monitoring relays
• DATE:2021-06-07
• Associated products:
  K8DS-PM Three-phase Voltage and Phase-sequence Phase-loss Relay/Features K8DS-PA Three-phase Asymmetry and Phase-sequence Phase-loss Relay/Features