Omron, K8AK-PH

Greater resistance to inverter noise.
Distinguishes between correct phases, phase sequence, and phase loss when power is turned ON.
Supports phase loss detection when the motor is operating.
5 A (resistive load) at 250 VAC, DPDT x 1.
Output status can be monitored using LED indicator.
Ideal to prevent reverse operation of motors.

last update: April 3, 2017

Ratings

Rated input voltage		3-phase, 200 to 480 VAC (3-wire)
Input load		Approx. 4.1 VA
Operating time	Phase sequence	0.1 s±0.05 s
Operating time	Phase loss	0.1 s max. (when the voltage changes rapidly from 100% to 0% of rated voltage)
Reset method		Automatic reset
Indicators		Power (PWR): Green, Relay output (RY): Yellow
Output relays		One DPDT relay (NC operation)
Output relay ratings		Rated load Resistive load 5 A at 250 VAC 5 A at 30 VDC Minimum load: 24 VDC, 4 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. 130 g
Mounting		Mounts to DIN Track.
Dimensions		22.5 × 90 × 100 mm (W×H×D)

Specifications

Input voltage range		200 to 480 VAC
Input frequency		50/60 Hz (no presumed range)
Overload capacity		Continuous 528 V
Phase loss detection level		80%±10% of rated input Calculation Formula = 1 - ((Highest phase-to-phase voltage - Lowest phase-to-phase voltage)/ Average three-phase phase-to-phase 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-PH 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.