ACI A/ACSX2 Adjustable Trip Point Current Switch
An adjustable current switch lets the installer set the trip threshold in the field, which is what makes it suitable for condition monitoring rather than simple on/off proof. Because the A/ACSX2 trip point can be placed between the loaded and unloaded current of a driven load, it can distinguish a motor that is running normally from one that is running but has lost its belt, is slipping, has a locked rotor, or is otherwise running under- or over-loaded. ACI lists overload, underload, broken belt, belt slippage, locked rotor and equipment failure as the supported applications for adjustable current switches.
The solid-core aperture requires the monitored conductor to be disconnected and threaded through the sensor, which suits new construction and OEM panel builds where the wiring is not yet terminated. Solid-core units are generally the lower-cost option and offer lower trip points than the equivalent split-core model.
Power for the switch is induced from the monitored conductor itself, so there is no 24 VAC or 24 VDC supply to run and no transformer to size. The unit ships with ACI's patented 35 mm DIN rail mounting foot (U.S. Patent No. 7,416,421) for panel installation.
Specifications on this page are taken from the ACI Adjustable Switches data sheet (ACS2, ACSX2, ASCS2 & ASCSX2 Series) and Installation & Operation Instructions I0000788 Rev. 12.0.
Best For
- Belt-loss, belt-slip and locked-rotor detection where the trip point must sit between loaded and unloaded current
- Preventative maintenance scheduling driven by measured load change
- Motor, pump, fan and compressor run status feedback to a BMS, PLC or DDC controller
- Proof-of-operation and run-status interlocks on air handlers and hydronic equipment
- Runtime accumulation and basic load trending from dry-contact closures
- Lighting circuit status and usage logging
Warranty
Key Features
Field-Adjustable Trip Point
Trip threshold is set in the field anywhere from 0.5 to 220 A, with 10% hysteresis typical, so the switch can be tuned to the actual load rather than a factory default.
Self-Powered by Induction
Power is induced from the monitored conductor. There is no 24 V supply to run, no transformer to size and no separate power wiring to install.
Solid-Core Aperture
Threaded aperture for new construction and OEM panel builds, with lower trip points and lower cost than the equivalent split-core model.
Normally-Closed (N/C) Dry Contact
Rated 0.2 A @ 200 VAC/VDC, wired to a 2-position screw terminal block that is not polarity sensitive. Contact resistance is under 10 Ohms tripped and over 1 Meg Ohm open.
Patented DIN Rail Mounting Foot
Snaps directly onto 35 mm DIN rail or mounts with two #8 Tek screws, in any orientation. U.S. Patent No. 7,416,421.
Two-Colour Status LED
Red indicates current above the trip point, blue indicates current below it, which makes setting the threshold a visual operation.
Technical Specifications
| ACI Item Number | 142354 |
| Core Style | Solid-Core |
| Trip Point Style | Adjustable Trip Point |
| Trip Point | 0.5 to 220 A |
| Amperage Range | 0 to 250 A |
| Contact Type | Normally-Closed (N/C) |
| Contact Rating | 0.2 A @ 200 VAC/VDC |
| Hysteresis | 10% of trip point, typical |
| Operating Frequency Range | 40 Hz to 1 kHz |
| Status LED Indication | Red LED (current above trip point) | Blue LED (current below trip point) |
| Monitored Current Type | AC Current |
| Maximum AC Voltage | 600 VAC |
| Sensor Power | Induced from the monitored conductor |
| Isolation Voltage | 2200 VAC |
| Contact On Resistance | Off Resistance | < 10 Ohms (tripped) | > 1 Meg Ohm (open) |
| Aperture Size | 0.75 in (19.05 mm) |
| DIN Rail Size | 35 mm (U.S. Patent No. 7,416,421) |
| Operating Temperature Range | 5 to 104 °F (-15 to 40 °C) |
| Operating Humidity Range | 0 to 95% RH, non-condensing |
| Recommended Storage Temperature | RH | 41 to 95 °F (5 to 35 °C) | 40 to 85% RH, non-condensing |
| Enclosure Material | Flammability Rating | PC/ABS (polycarbonate / ABS blend) | UL94-V0 |
| Wiring Connections | 2-position screw terminal block (not polarity sensitive) |
| Wire Size | 16 to 22 AWG (1.31 mm2 to 0.33 mm2), copper wires only |
| Terminal Block Torque Rating | 4.43 to 5.31 in-lbs (0.5 to 0.6 Nm) |
| Minimum Mounting Distance | 1 in (2.6 cm) from relays, contactors and transformers |
| Agency Approvals | UL/CUL US Listed (UL 508) Industrial Control Equipment, File # E309723, CE, RoHS2, WEEE, UKCA |
| Product Dimensions (L x W x H) | 2.760 in (70.11 mm) x 3.343 in (84.92 mm) x 1.050 in (26.67 mm) |
| Product Weight | 0.216 lbs (0.097 kg) |
| Warranty | Five (5) Year Limited Warranty |
Not intended for use in life / safety applications or in hazardous / classified locations.
Response Time
| Current Above Trip Point | Response Time |
|---|---|
| 0.50 A | 260 mS |
| 0.75 A | 169 mS |
| 1.0 A | 130 mS |
| 10 A | 82 mS |
| 20 A | 74 mS |
Documentation
ACI Adjustable Switches Data Sheet (ACS2, ACSX2, ASCS2 & ASCSX2 Series)ACI Adjustable Switches Series Installation & Operation Instructions (I0000788 Rev. 12.0)Related Products
Frequently Asked Questions
What is the trip point of the ACI A/ACSX2?
The A/ACSX2 trip point is 0.5 to 220 A. It is adjustable in the field over that range, with 10% hysteresis typical.
Does the ACI A/ACSX2 need external power?
No. Power is induced from the conductor being monitored, so no 24 VAC or 24 VDC supply, transformer or power wiring is required. The two terminals carry the dry contact output only.
Is the ACI A/ACSX2 solid-core or split-core?
The A/ACSX2 is solid-core. Solid-core units require the conductor to be threaded through the aperture, so they suit new installations and OEM panel builds.
What is the contact rating of the ACI A/ACSX2?
The status contact is Normally-Closed (N/C) rated 0.2 A @ 200 VAC/VDC. Contact resistance is under 10 Ohms when tripped and over 1 Meg Ohm when open.
What amperage range does the ACI A/ACSX2 monitor?
The A/ACSX2 monitors 0 to 250 A with a maximum conductor voltage of 600 VAC and 2200 VAC isolation.
ACI Five (5) Year Limited Warranty. This product is covered by Automation Components, Inc.’s Five (5) Year Limited Warranty, published in the front of the ACI Sensors & Transmitters catalog and on the ACI website. Warranty terms are set by the manufacturer and are subject to change without notice.
- Mounting Type:
- Solid-Core
- Setpoint:
- Adjustable Trip
- Contact Type:
- Normally Closed
- Amp Range:
- 0-250A
- Trip Point:
- 0.5-220A
- Contact Rating:
- 0.2 A @ 200 VAC/VDC
- Contact Termination:
- Terminal Strip
- Sensor Power:
- Self-Powered
- Warranty:
- 5-Year Limited
