© 2018 Littelfuse Protection Relays & Controls

www.littelfuse.com/

Rev: 1-A-062716

Protection Relays

Current Monitoring Relays and Transducers

www.littelfuse.com/ecs

ECS SERIES

Specifications

Sensor

Type

Toroidal through hole wiring

Mode

Over or undercurrent, switch selectable on the

unit or factory fixed

Trip Point Range

0.5 - 50A in 3 adjustable ranges or fixed

Tolerance

Adjustable

Guaranteed range

Fixed

0.5 - 25A: 0.5A or ±5% whichever is less;

26 - 50A: ±2.5%

Maximum Allowable Current Steady – 50A turns;

Inrush – 300A turns for 10s

Trip Point Hysteresis

≅ ±5%

Trip Point vs. Temperature

±5%

Response Time

≤ 75ms

Frequency

45/500 Hz

Type of Detection

Peak detection

Trip Delay

Type

Analog

Range

Adjustable

0.150 - 7s; 0.5 - 50s (guaranteed ranges)

Factory Fixed

+/- 10%

Delay vs. Temperature

±15%

Sensing Delay on Startup

Factory fixed 0 - 6s: +40%, -0%

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

Form

Isolated, SPDT

Rating

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

1/2 hp @ 250VAC

Life

Mechanical – 1 x 106 ; Electrical – 1 x 105

Protection

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

0.25 in. (6.35 mm) male quick connect

terminals (5)

Environmental

Operating/Storage

Temperature

-40° to 60°C / -40° to 85°C

Humidity

95% relative, non-condensing

Weight

≅ 6.4 oz (181 g)

NO = Normally Open

Contact

NC = Normally Closed

Contact

A = Sensing Delay On

Start Up

TD =Trip Delay

TP =Trip Point

R = Reset

OC = Monitored Current

Function Diagrams

Overcurrent Sensing

Undercurrent Sensing

Rev: 1-A-101218

Disclaimer Notice – Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products

are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/product-disclaimer.