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K8DS-PU

3-phase undervoltage and phase-sequence phase-loss relay

The K8DS-PU is the simplified 3-phase monitoring relay, 3-wire circuits within one unit. It can monitor undervoltages, phase sequence and phase loss.

Greater resistance to inverter noise
One SPDT output relay, 5 A at 250 VAC (resistive load)
World-wide power specifications supported by one unit (Set with a rotary switch)
Relay status can be monitored using LED indicator

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Specifications & ordering info

Ordering information

Rated input		Order code
3-phase 3-wire mode	200, 220, 230, 240 VAC	K8DS-PU1
3-phase 3-wire mode	380, 400, 415, 480 VAC	K8DS-PU2

Specifications

Ambient operating temperature		−20 to 60°C (with no condensation or icing)
Storage temperature		−25 to 65°C (with no condensation or icing)
Altitude		2,000 m max.
Voltage fluctuation range (UNDER)		Undervoltage 30 to 25% of rated input voltage
Input frequency		50/60 Hz (AC power supply)
Output relays (1× SPDT, normally closed operation)	Resistive load	5 A at 250 VAC or at 30 VDC
	Maximum contact voltage	250 VAC or 30 VDC
	Maximum contact current	5 A
	Maximum switching capacity	1,250 VA, 150 W
	Mechanical life	10,000,000 operations
	Electrical life	50,000 operations at 5 A, 250 VAC
Degree of protection		Terminal section: IP20
Case material		PC UL94 V-0
Weight		Approx. 65 g
Rated input voltage	K8DS-PU1	3-phase, 3-wire mode: 200, 220, 230, 240 VAC
Rated input voltage	K8DS-PU2	3-phase, 3-wire mode: 380, 400, 415, 480 VAC
Operation (overvoltage or undervoltage)	Operating value setting range	Undervoltage = −30% to 25% of maximum rated input voltage
Operation (overvoltage or undervoltage)	Operating value	100% operation at set value
Reset (HYS.)	Hysteresis	5% of operating value (fixed)
Reset (HYS.)	Resetting method	Automatic reset
Operating time (T)	Undervoltage	0.1 to 30 s
	Phase-sequence	0.1 s ±0.5 s
	Phase-loss	0.1 s ±0.05 s
Power ON lock (LOCK)		0.1 s ±0.5 s
Overload capacity		Continuous input: 500 V
Repeat accuracy	Operating value	±0.5% full scale (at 25°C and an ambient humidity of 65% at the rated power supply voltage, 50/60 Hz sine wave input)
Repeat accuracy	Operating time	±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Indicators		Power (PWR): Green LED, relay output (RY): Yellow LED, UNDER: Red
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 and CCC
Size in mm (H × W × D)		80 × 17.5 × 74