ECSH40AC - ECS Series

Series: ECS Questions? Contact Littelfuse Support
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.

Property (Mouseover for details) Value
Input Voltage (V) 120VAC
Input Tolerance (%) -20--10%
Input AC Line Frequency (Hz) 50/60Hz
Output Type Electromechanical relay
Output Form Isolated SPDT
Output Load Rating (VA) 10A resistive @ 240VAC; 1/4hp @ 125VAC; 1/2hp @ 250VAC
Response Time (ms) ≤75ms
Trip Delay Type Analog
Trip Delay Range 0.150 - 7s adjustable
Trip Delay Sensing on Startup (s) Factory fixed 0-6s: +40% -0%
Trip Delay vs Temperature ±15%
Trip Point Range 0.5-5a adjustable
Trip Point Hysteresis (%) ±5%
Trip Point vs Temperature ≅±5%
Sensor Type Toroidal Through-Hole Wiring
Sensor Mode Over or undercurrent switch selectable on the unit or factory fixed
Sensor Tolerance Guaranteed range
Current Sensor Range Maximum: Steady - 50A turns; Inrush - 300A turns for 10s
Sensor Frequency (Hz) 45/500Hz
Insulation Resistance ≥100 MΩ
Isolation Voltage (V) ≥2500V RMS input to output
Circuitry Encapsulated
Type of Detection Peak detection
Life Mechanical - 1 x 106; Electrical - 1 x 105
Termination Type 0.25 in. (6.35mm) male quick connect terminals (5)
Mounting Method Surface mount with two #6 (M3.5 x 0.6) screws
Operating Temperature -40° to 60°C (-40°F to 140°F)
Storage Temperature (F/C) -40° to 85°C (-40°F to 185°F)
Humidity 95% relative non-condensing
Dimensions 3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)
Weight (lbs/g) ≅6.4oz (181g)