Littelfuse ECSW4MBHT, ECSW Series, Current Sensors, Current Sensing AC 120VAC, SPDT (1 Form C)
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The ECSW Series of single-phase, AC window, current sensors includes adjustable overcurrent and undercurrent trip points. Detects locked rotor, jam, loss of load, an open heater or lamp load, a broken belt, or loss of suction. LED’s aid in trip point adjustment and provide fault indication. The built-in toroidal sensor eliminates the need for an external current transformer. The output can be electrically latched after a fault, or automatically reset. Remote resetting of a latched output by removing input voltage. The unit includes switch selectable zero current detection and normally de-energized or energized output operation. Time delays are included to improve operation and eliminate nuisance tripping
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 |
| LED indication | Visual indication for trip point adjustment and fault indication |
| Multiple switch selectable features | User selectable zero current detection, latched, normally de-energized, or energized output adds application flexibility |
| Adjustable trip delay | Eliminates nuisance tripping and prevents rapid cycling |
| Isolated 10A, SPDT output contacts | Allows control of loads for AC or DC voltages |
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 |
| Trip 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 |
| 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) |