DLMUBLAAA Datasheet DLMUBLAAA | P1-P2

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Rev: 1-A-062716

Protection Relays

Voltage Monitoring Relays

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DLMU SERIES

Description

The DLMU Series is a universal voltage, 3-phase voltage

monitor. It continuously measures the voltage of each of the

three phases with microcontroller accuracy and compares the

value to preset trip points. It separately senses phase reversal

and loss; over, under and unbalanced voltages; and over or

under frequency. Protection is assured during periods of large

average voltage ﬂuctuations or when regenerated voltages

are present. The unit trips within 200ms when phase loss

is detected. Adjustable time delays are included to prevent

nuisance tripping and short cycling of sensitive equipment.

The isolated, 10A, SPDT and 2A alarm output relay contacts

trip when a phase voltage exceeds the trip limits for the trip

delay. Nominal line voltage, voltage unbalance, and time

delays are knob adjustable. The phase loss setpoint and the

acceptable frequency range are ﬁxed. Both delt a and wye

systems can be monitored; no connection to neutral is required.

Operation

Upon application of line voltage, the output is de-energized

and the restart delay begins. If all the 3-phase voltages are

within the acceptable range, the output energizes at the end

of the restart delay. The microcontroller circuitry automatically

senses the voltage range, and selects the correct operating

frequency (50 or 60Hz). The over and undervoltage trip points

are set automatically. When the measured value of any phase

voltage exceeds the acceptable range limits (lower or upper)

the trip delay begins. At the end of the trip delay the output

relay de-energizes. If the phase voltage returns to an acceptable

value before the trip delay expires, the trip delay is reset and the

output remains energized. Under, over, and unbalanced voltages

plus over or under frequency must be sensed for the complete

trip delay before the unit trips. The unit trips in 200ms when

phase loss or reversal are sensed. The unit will not energize if a

fault is sensed as the line voltage is applied.

Reset: Reset is automatic upon correction of the voltage or

frequency fault or phase sequence.

Ordering Information

MODEL LINE VOLTAGE OUTPUT RESTART FUNCTION VOLTAGE UNBALANCE TRIP DELAY RESTART DELAY

DLMHBRAAA 500 to 600VAC SPDT & NO Staggered restart Adjustable 2 - 10% Adjustable 1 - 30s Adjustable 0.6 - 300S

DLMUBLAAA 200 to 480VAC SPDT & NO Lockout, min off time Adjustable 2 - 10% Adjustable 1 - 30s Adjustable 0.6 - 300S

DLMUBNAAN 200 to 480VAC SPDT & NO No restart delay Adjustable 2 - 10% Adjustable 1 - 30s None

DLMUBRAAA 200 to 480VAC SPDT & NO Staggered restart Adjustable 2 - 10% Adjustable 1 - 30s Adjustable 0.6 - 300S

If you don’t ﬁnd the part you need, call us for a custom product 800-843-8848

Wiring Diagram

L1, L2, L3 = Line Voltage Input

NO = Normally Open Contact

NC = Normally Closed Contact

C = Common, Transfer Contact

CAUTION: 2 amp max. fast acting fuses are

recommended to protect the equipment‘s wiring.

They are not required to protect the DLMU.

! = Select alarm contact connection as N.O. or N.C. when ordering;

N.O. Shown.

Features & Beneﬁts

FEATURES BENEFITS

Proprietary

microcontroller

based circuitry

Constant monitoring to protect against phase loss,

phase reversal, over voltage, under voltage,

unbalance, short cycling and over/under frequency

Universal line

voltage range

Flexibility to work in 200 to 480VAC or 500 to

600VAC applications

DIN rail (35mm) or

surface mounting

Installation ﬂexibility

LED indication

Provides diagnostics of relay, fault and time

delay status

User adjustable

time delays

Prevents nuisance tripping and short cycling of

sensitive equipment

www.littelfuse.com/

Rev: 1-A-062716

Protection Relays

Voltage Monitoring Relays

www.littelfuse.com/dlmu

DLMU SERIES

Restart Delay Options

L = Lockout or minimum OFF time. The restart delay begins

when the output trips. The unit cannot be re-energized until the

restart delay is complete. This provides a minimum off time

or lockout time to allow equipment sensitive to short cycling,

time to reset. If the fault is corrected after the restart delay is

complete the output energizes immediately. The restart delay

also occurs when line voltage is applied/reapplied.

R = Restart Delay on fault correction. The restart delay begins

when line voltage is reapplied or when a voltage fault is

corrected. This option is normally selected when staggered

restarting of multiple motors on a power system is required.

N = No Restart Delay. 0.6 second initialization delay on

application of line voltage applies.

Restart Notes: All restart options remain reset when the

following conditions are detected:

1. Phase loss (phase unbalance greater than 25%)

2. Average line voltage less than 120VAC

3. Phase reversal

The restart delay begins when the condition is corrected.

LED Operation

The LED ﬂashes green during the restart delay, then glows

green when the output energizes. It ﬂashes red during the trip

delay then glows red when the output de-energizes. It ﬂashes

red/green if phase reversal is sensed. If a fault is sensed during

the restart delay, the LED will glow red during that portion or the

full restart delay.

Accessories

LPSM003ZXID (Indicating),

LPSM003Z (Non-indicating) Fuse Holders

Littelfuse POWR-SAFE Dead Front holders

provide optimum protection to personnel for

Class CC and Midget-Style fuses. 600 VAC/DC

0KLK002.T Midget Fuse (2 Amp)

10 x 38 fast acting, high-interrupting capacity,

current-limiting type fuse. 600 Vac/500 Vdc

C103PM (AL) DIN Rail

35 mm aluminum DIN rail available in a 36 in.

(91.4 cm) length.

Speciﬁcations

Line Voltage

Type 3-phase delta or wye with no connection

to neutral

Operating Voltage

200-480VAC Voltage Line Line Voltage

Range Adj.Range Frequency Max.

240 200-240VAC 50/60Hz

380 340-420VAC 50Hz

480 400-480VAC 60Hz 550VAC

600VAC 600 500-600VAC 50/60Hz 600VAC

AC Line Frequency 50/60 Hz automatically detected

Phase Loss ≥ 25% unbalance

Response Time ≤200ms

Undervoltage & Voltage

Unbalance

Type Voltage detection with delayed trip &

automatic reset

Overvoltage

TripVoltage 109 - 113% of the adjusted line voltage

Reset Voltage ≅ -3% of the trip voltage

Undervoltage

Trip Voltage 88 - 92% of the adjusted line voltage

Reset Voltage ≅ +3% of the trip voltage

Voltage Unbalance Adjustable 2 - 10% or specify ﬁxed unbalance

of 2 - 10% in 1% increments

Reset on balance ≅ -0.7% unbalance

Trip Delay

Active On Over/undervoltage, voltage unbalance, over/

under frequency

Range Adjustable from 1 - 30s or specify ﬁxed delay

1 - 30s in 1s increments

Tolerance ± 15%

Restart Delay

Range Adjustable from 0.6 - 300s; if no restart delay

is selected a 0.6s initialization delay applies

Tolerance ± 15%

Over/Under Frequency ±4%; Reset ±3%; 50/60 Hz

Phase Sequence A, B, C, L1, L2, L3

Response Time -Phase

Reversal & Phase Loss ≤200 ms

Reset Automatic

Output

Type Isolated Electromechanical Relay

Form C Isolated, SPDT

Form C Rating 10A resistive @ 240VAC;

8A resistive @ 277VAC; NO-1/4 hp @ 120VAC;

1/3 hp @ 240VAC

Form A Isolated, NO, SPST

Form A Rating 2A @ 277VAC

Life Mechanical - 1 x 10

; Electrical - 1 x 30

Protection

Phase Reversal/Failure ASME A17.1 Rule 210.6

Motors and Generators NEMA MG1 14:30, 14:35

Surge IEEE C62.41-1991 Level B

Isolation Voltage ≥ 2500V RMS input to output

Mechanical

Mounting Surface mount with 2 #8 (M4 x 0.7) screw or

snap on 35mm DIN Rail

Note: 0.25 in.(6.35 mm) spacing between

units or other devices is required

Dimensions H 110 mm (4.33”); W 75 mm (2.95”);

D 50 mm (1.97”)

Termination Screw terminals with captive wire clamps for

up to #14 AWG (2.5 mm

) wire

Terminal Torque 4.4 in.-lbs.

Environmental

Operating/Storage

Temperature -40° to 60°C / -40° to 85°C

Humidity 95% relative, non-condensing

Weight ≅ 8.6 oz (244 g)

P1-P2

DLMUBLAAA

Mfr. #:

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Manufacturer:

Littelfuse

Description:

Industrial Relays 120V 0.5-5A 0.150-7s CURRENT SENSOR 2s

Lifecycle:

New from this manufacturer.

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