© 2016 Littelfuse Protection Relays & Controls

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 106; Electrical - 1 x 303

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 mm2) 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)