ACI A/CS2 Fixed Trip Point Current Switch
A fixed trip point current switch answers one question: is the equipment drawing current or not. The A/CS2 trips at 0.25 A or less, which is set at the factory and is not field-adjustable. That makes it the right choice for go / no-go status where the only requirement is a reliable dry contact and no commissioning adjustment is wanted.
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 Fixed Status Switches data sheet (CS2, CSX2, SCS2 & SCSX2 Series) and Installation & Operation Instructions I0000787 Rev. 8.0.
Best For
- 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
- Local alarm triggering with strobes and audible devices
Warranty
Key Features
Factory-Set Trip Point
Trips at 0.25 A or less. The trip point is set at the factory and is not field-adjustable, so there is no commissioning step to perform.
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-Open (N/O) 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.
Red Status LED
Illuminates when the monitored current is above the trip point. At very low currents the LED may not be visible, so it should not be used to confirm the presence of current.
Technical Specifications
| ACI Item Number | 142340 |
| Core Style | Solid-Core |
| Trip Point Style | Fixed Trip Point |
| Trip Point | 0.25 A or less |
| Amperage Range | 0 to 250 A |
| Contact Type | Normally-Open (N/O) |
| Contact Rating | 0.2 A @ 200 VAC/VDC |
| Operating Frequency Range | 40 Hz to 1 kHz |
| Status LED Indication | Red LED (monitored current is above 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 (0.099 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 |
|---|---|
| 0.15 A | 156 mS |
| 0.20 A | 100 mS |
| 0.25 A | 84 mS |
| 1.0 A | 32 mS |
| 10 A | 26 mS |
| 20 A | 24 mS |
Documentation
ACI Fixed Status Switches Data Sheet (CS2, CSX2, SCS2 & SCSX2 Series)ACI Current Fixed Switches Series Installation & Operation Instructions (I0000787 Rev. 8.0)Related Products
Frequently Asked Questions
What is the trip point of the ACI A/CS2?
The A/CS2 trip point is 0.25 A or less. It is factory set and cannot be adjusted.
Does the ACI A/CS2 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/CS2 solid-core or split-core?
The A/CS2 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/CS2?
The status contact is Normally-Open (N/O) 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/CS2 monitor?
The A/CS2 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:
- Fixed Trip
- Contact Type:
- Normally Open
- Amp Range:
- 0-250A
- Trip Point:
- 0.25A
- Contact Rating:
- 0.2 A @ 200 VAC/VDC
- Contact Termination:
- Terminal Strip
- Sensor Power:
- Self-Powered
- Warranty:
- 5-Year Limited
