© 2016 Littelfuse Protection Relays & Controls

www.littelfuse.com/

Rev: 1-A-062716

Protection Relays

Current Monitoring Relays and Transducers

www.littelfuse.com/ecsw

ECSW SERIES

Specifications

Sensor

Type

Toroid, through hole wiring for up to #4 AWG

(21.1 mm2) THHN wire

Mode

Over & undercurrent trip points

(window current sensing)

Trip Point Range

0.5 - 50A in 3 adjustable ranges

Tolerance

Guaranteed range

Maximum Allowable Current Steady - 50A turns; Inrush - 300A turns for 10s

Time Point vs Temp.

& Voltage

±5%

Response Time

≤ 75ms

Frequency

45/500 Hz

Type of Detection

Peak detection

Zero Current Detection

< 250mA turns typical

Time Delay

Range

0.15 - 50s in 2 adjustable ranges

or 0.1 - 50s fixed

Tolerance

Adjustable: guaranteed range; Fixed: ±10%

Sensing Delay On Start Up

Fixed ≅ 0.1 - 6s in 1s increments

Tolerance

+40% -0%

Delay vs. Temp. & Voltage

±15%

Input

Voltage

24, 120, or 230VAC; 12 or 24VDC

Tolerance

12VDC & 24VDC/AC

-15% - 20%

120 & 230VAC

-20% - 10%

AC Line Frequency

50/60 Hz

Output

Type

Electromechanical relay

Mode: Switch Selectable

ON

Energized during normal operation,

de-energized after a fault

OFF

De-energized during normal operation,

energizes during a fault

Form

Isolated, SPDT

Rating

10A resistive @ 240VAC; 1/4 hp @ 125VAC;

1/2 hp @ 250VAC

Life

Mechanical - 1 x 106; Electrical - 1 x 105

Latch

Type

Electrical

Reset

Remove input voltage

Function

Switch selectable latching function

Protection

Surge

IEEE C62.41-1991 Level A

Circuitry

Encapsulated

Isolation Voltage

≥ 2500V RMS input to output

Insulation Resistance

≥ 100 MΩ

Mechanical

Mounting

Surface mount with two #6 (M3.5 x 0.6)

screws

Dimensions

H 88.9 mm (3.5”); W 63.5 mm (2.5”);

D 44.5 mm (1.75”)

Termination

0.197 in. (5 mm) terminal blocks for up to #12

(3.2 mm2) AWG wire

Environmental

Operating/Storage

Temperature

-40° to 60° C/-40° to 85° C

Humidity

95% relative, non-condensing

Weight

≅ 6.4 oz (181 g)