The AC-PRO® Trip unit is a solid state, true RMS sensing overcurrent device for use on 600 volt class circuit breakers. The AC-PRO® comes standard with Long-Time, Short-Time, Instantaneous, Ground Fault, and Phase Unbalance protections. Each of these protective features can be turned on or off at any time except for the Long-Time setting. The units do not use ratings plugs and have a programmable CT rating. These features allow one unit to be used in a wide variety of different breakers. This simplifies the use, standardization, maintenance, training and spares situation throughout a facility. All of the interaction with the AC-PRO® is done through the front mounted backlit LCD and key panel. The settings for all of the functions are made in Amps and Seconds and are saved in non-volatile memory. In order to prevent accidental modification of the settings, the AC-PRO® has a security key that must be inserted in the top of the unit before changing settings. There is also an added security procedure that must be done before changing the CT rating. 

Without the security key inserted, the AC-PRO® functions in a read-only mode. The last trip data, trip history and commissioning data can all be viewed, but nothing in the unit can be modified. When the AC-PRO® is in service it will display continuous 3-phase current monitoring on the LCD.  When the current exceeds the Long-Time pickup value the LCD will display OVERLOAD and list the phase and current, the red PICKUP LED will also illuminate. The green "SELF TEST OK" LED on the front of the unit indicates that the AC-PRO® is functioning properly. When the LED is illuminated it indicates that the software routines and microcontroller are functioning properly and the actuator is connected. During normal operation the AC-PRO® is powered by breaker mounted CT’s and will power up at 10% of the CT rating.  When there is no CT power the AC-PRO® can be powered by the PT Module, an auxiliary power pack or the internal battery. The internal battery is a 9 volt lithium type battery that is only used to power the display for reviewing trip data or commissioning the unit when there is no other power supply.

The battery is not used for any of the protective features or to save any of the information on the unit.smallest size window ac unit The AC-PRO® is designed to be used in wide range of rugged environments. how to cover ac unit in winterThe entire unit is housed in an extruded aluminum housing, the circuit boards are conformally coated and the keypad is covered in a contamination resistant membrane. how to properly size a central ac unitEvery AC-PRO® is tested under load and at elevated temperature for 24 hours before being released. None of the units are batch tested. The AC-PRO® can be supplied as part of a complete retrofit kit. The kits include everything you would need to completely retrofit a breaker (brackets, mounting hardware, wiring, actuators, CT’s, installation documentation and instruction manuals).

All AC-PRO®’s are covered by a 2 year limited warranty The following options and accessories are available for the AC-PRO®. The AC-PRO® also has theQUICK-TRIP®arc flash reduction system available. The QUICK-TRIP® system helps reduce the arc flash hazard on downstream equipment for times when personal must work on energized equipment. The QUICK-TRIP® system can be turned on and off without opening the cubicle door and features: To ensure that the AC-PRO® will function when needed it was tested to the ANSI C.37.59 Standards for fault interruption. As a result of this testing the AC-PRO® is UL listed on the following breakers. The AC-PRO® was tested & is certified to withstand radio frequency interference per the ANSI C37.90.2 Standard The AC-PRO-II® is 55% smaller than the original AC-PRO® and has the standard trip unit functions of Long-Time, Short-Time, Instantaneous and Ground Fault. The AC-PRO-II® also includes the following additional features.

UL and CE Certification To ensure that the AC-PRO-II® will function when needed it was tested to the ANSI C.37.59 Standards for fault interruption. As a result of this testing the AC-PRO-II® is UL listed on a variety of breakers. Please see the AC-PRO-II® UL Listings table for a compete breakdown. The UL mark is in the process of being updated and modernized by UL. When Utility Relay Company designed the AC-PRO-II® we decided to use the new enhanced version of the UL mark so we would be compliance with any future UL regulations. The SAFETY US-CA wording on the UL label designates that our product has been evaluated to United States and Canadian safety requirements. If you have more questions about this please visit the UL website for more details. UL-Marks for North America The E number at the bottom of the mark is a unique identifier that can be used to access more information about the products UL certification. Information about Utility Relay Company's E number can be found here: UL AC-PRO® Product Family

The AC-PRO-II® was tested & is certified to withstand radio frequency interference per the ANSI C37.90.2 Standard The CTs, Actuators and wiring harness from the original AC-PRO® can be used with the AC-PRO-II®. This makes upgrading the trip unit very simple and fast. RS485 Modbus RTU communications is standard on every AC-PRO-II®. The AC-PRO-II® can be integrated into various industry standard HMI systems that have a Modbus RTU driver. A few examples are: The front mounted and electrically isolated USB port allows for easy downloading of trip data and protection settings. It can also be used to upload the trip unit settings, making commissioning the trip unit much faster. NOTE: If the AC-PRO-II® is located behind a cubicle door, a USB panel mount extension will be provided with the retrofit kit. Click here to see details on the USB panel mount extension. Settings are programmed using the OLED multi-line display and smart buttons that change their function according to the information displayed.

All of the settings are entered using simple parameters. No percentages or multipliers are required. The easy to read multi-line display provides real time monitoring of 3-phase, neutral and ground fault currents. The display unit can be rotated to allow the trip unit to fit in a variety of different breaker configurations. The trip units retains all of the trip data for that last 8 trip events. This data includes a date and time stamp of each event from the integrated real time clock. The waveforms are also captured for each of the 8 trip events. The AC-PRO-II® is compatible with the QUICK-TRIP® Arc Flash Reduction system. The QUICK-TRIP® system is a manually controlled arc flash hazard reduction system. It can reduce trip times when turned on and allows selective coordination between circuit breakers when turned off. If maintenance personnel must work on energized equipment, they will first turn the QUICK-TRIP® system on at the upstream breaker feeding the equipment or breaker.

fault now occurs, the upstream breaker will trip quickly based on the QUICK-TRIP® settings reducing the Arc Flash When the maintenance work is finished, the QUICK-TRIP® system is turned off and the original selective coordination is back in effect. The AC-PRO-II® is user configurable for 50Hz or 60Hz applications. The green LED indicates that the trip unit is operating properly. The "Self-Test OK" feature performs the following: All AC-PRO-II®’s come with a 2-year limited warranty. Whenever voltage and power data is necessary, a VDM (Voltage Divider Module) can be attached to the back of the AC-PRO-II® trip unit. With the VDM the following data is available on the display and through RS485 Modbus RTU communications. A graphical User Interface application called the InfoPro-AC is available for easy interface between a laptop computer and the USB port on the AC-PRO-II®. The InfoPro-AC will provide access to the following items: The patented Sluggish Breaker® operation detection captures the interruption time for a first trip.