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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | SSAC / Littelfuse |
| Manufacturer Product Number | ECSH40AH |
| Description | Current Monitor Relay; Overcurrent; 0.5-5A; 120V AC; TD 0.15-7s adj; Start 6s; SPDT |
| Datasheet | Download Datasheet |
The Littelfuse SSAC ECSH40AH is a single-phase AC overcurrent sensor with a built-in toroidal current sensor and an isolated SPDT relay output, powered from 120 V AC. Its trip point is adjustable from 0.5 to 5 A. The trip delay is adjustable from 0.15 to 7 s, with a 6 s start-up delay so starting current does not trip it.
Energizes when a fault is sensed throughout the trip delay; resets when the current returns to normal or zero. Detects locked rotor, loss of load, an open heater or lamp load, or proves an operation is taking place.
Output: 10 A resistive @ 240 VAC; 1/4 hp @ 125 VAC, 1/2 hp @ 250 VAC. Sensor: Built-in toroidal sensor (through-hole wiring); 50 A-turns steady, 300 A-turns inrush for 10 s. Trip point: Adjustable trip point, 0.5-5 A. Hysteresis: ≈±5%. Supply tolerance: -20% / +10% of nominal; 50/60 Hz. Indicator: LED (trip / output status). Life: 1,000,000 operations mechanical, 100,000 operations electrical.
It is surface mounted with two #6 screws and has 0.250 in (6.3 mm) male quick-connect terminals. Dimensions: 88.9 x 63.5 x 44.5 mm (3.5 x 2.5 x 1.75 in), H x W x D. It operates from -40 to +60 °C and stores from -40 to +85 °C.
| Category | |
| Manufacturer | SSAC / Littelfuse |
| Model | ECS |
| Monitoring Function | AC Overcurrent, factory set |
| Sensor Type | Built-in toroidal sensor (through-hole wiring); 50 A-turns steady, 300 A-turns inrush for 10 s |
| Selector Switch | Overcurrent, factory fixed |
| Setting Adjustment | Analog (onboard knobs) |
| Current Range | 0.5-5 A |
| Pickup Current Setting | Adjustable trip point, 0.5-5 A |
| Output Mode | Energizes when a fault is sensed throughout the trip delay; resets when the current returns to normal or zero. Detects locked rotor, loss of load, an open heater or lamp load, or proves an operation is taking place |
| Input Voltage | 120V AC |
| Input Operating Range | -20% / +10% of nominal; 50/60 Hz |
| Trip Delay | 0.15-7 s adjustable |
| Sensing Delay on Power-Up | 6 s start-up delay |
| Setting Accuracy | Guaranteed range; ±5% over temperature |
| Hysteresis | ≈±5% |
| Reset Method | Automatic |
| Status Indicator | LED (trip / output status) |
| Contact Configuration | SPDT |
| Output Rating | 10 A resistive @ 240 VAC; 1/4 hp @ 125 VAC, 1/2 hp @ 250 VAC |
| Mounting Type | Surface Mount |
| Termination Style | Quick Connect - 0.250" (6.3mm) |
| Dimensions | 88.9 x 63.5 x 44.5 mm (3.5 x 2.5 x 1.75 in), H x W x D |
| Operating Temperature (Storage) | -40...+60 °C (-40...+85 °C) |
| Mechanical Life | 1,000,000 operations (100,000 operations) |