Littelfuse ECS2HBC, ECS Series, Current Sensors, Current Sensing AC 24VAC, SPDT (1 Form C)
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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.
Features & Benefits
| Built-in toroidal current sensing | Eliminates need to install stand-alone current transformer and provides isolation from monitored circuit |
| Encapsulated | Protects against shock, vibration, and humidity |
| Adjustable mode, trip point and trip delay | Provides flexibility for use in many applications |
| 10A, SPDT isolated relay output | Allows control of AC voltage loads |
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 VAC; 24VDC |
| Tolerance |
12VDC & 24VDC/AC: -15 - 20% |
| 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) |