ECS Series - Current Sensor

Littelfuse Current Monitoring Relays Transducers
The ECS Series of single-phase AC current sensors is a universal, overcurrent or undercurrent sensing control. Its built-in toroidal sensor eliminates the inconvenience of installing a stand-alone current transformer. Includes onboard adjustments for current sensing mode, trip point, and trip delay. Detects over or undercurrent events like locked rotor, loss of load, an open heater or lamp load, or proves an operation is taking place or has ended.


Operation
Input voltage must be supplied at all times for proper operation. When a fault is sensed throughout the trip delay, the output relay is energized. When the current returns to the normal run condition or zero, the output and the delay are reset. If a fault is sensed and then corrected before the trip delay is completed, the relay will not energize and the trip delay is reset to zero.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Output
Form
Termination TypeMounting MethodDimensionsWeight (lbs/g)Compare
ECS20BC24VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS21BC24VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS2HBC24VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS30AC24VDCIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS31AC24VDCIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS40A120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS40AC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS40BC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS41A120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS41AC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS41BC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS41BD120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS41BH120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS4HBC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS4HBH120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS60AH230VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS60BC230VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS61BC230VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECS6HAH230VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH21F2.5C24VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH30AC24VDCIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH31AD24VDCIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH34F.08C24VDCIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH3HF0.08D24VDCIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH40A120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH40AC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH40AD120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH41AC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH41AD120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH41BC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH41F.08D120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH4HAD120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH4HF.08D120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSH61AD230VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL31A24VDCIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL40AC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL40B120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL40BH120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL41A120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL41AD120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL41AH120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL4HAC120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL4HBH120VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL61AH230VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)
ECSL6HAC230VACIsolated SPDT0.25 in. (6.35mm) male quick connect terminals (5)Surface mount with two #6 (M3.5 x 0.6) screws3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)≅6.4oz (181g)