Switchgear
Switchgear----ERMS: Energy Reduction Maintanance Switch
“Turn this ON Before Electricity Gets Angry”? What is ERMS ? The Energy Reduction Maintenance Switch (ERMS) is a safety feature built into switchgear to reduce the danger of arc flash during maintenance activities. It is typically activated using a ...
Air Circuit Breaker (ACB) Arc Formation and Quenching
Arc Formation: When an ACB is opened under load, the contacts ie fixed and moving contacts seperates ,but the flowing of current doesnot stop instantly. Instead the air betwen contacts becomes ionized, which creates an electric arc that continues to ...
Primary Injection Test
Primary Injection Test Primary Injection Test is a comprehensive electrical testing method used to verify protection chain of a power system by injecting a high current directly into the primary side(the main power-carrying conductors) What Does It ...
ACB ERMS Activation
For ERMS, units are shipped with the default setting as “No Trip.” Therefore, when using P-type or S-type STU, the OP Mode must be changed to “Trip” on the STU screen. For A-type, the OP Mode must be changed to “Trip” using the software in order for ...
Accuracy dropped after STU replacement
If the STU is replaced outside the factory, the measurement accuracy of the STU may decrease, as shown in the table below. OCR STU P/S N A P/S Factory Calibration Current 6% - 0.5% 0.5% Voltage 3% - - 0.5% Power 10% - - CLASS 1.0 Calibration ...
ACB Resistance and Power dissipation
Can the ACB cradle terminals be reoriented vertical to horizontal unbolted and reattached by the customer?
Can the ACB cradle terminals be reoriented vertical to horizontal unbolted and reattached by the customer? Apart from models 3200E and 6000G, it is possible to reconfigure the bus direction on both the ACB and cradle. Please note, however, that ...
TE Connectivity AMP 172773-1 Terminal – Specifications & Application Guide
Manufacturer Information Manufacturer: TE Connectivity (AMP Brand) Part Number: 172773-1 Category: Crimp Terminal / Contact Application: Used in connector housings for signal and low-current power transmission
User Jack and Crimping Tools
This article contains comprehensive information on the user jacks and terminal configurations involved in ACB (Air Circuit Breaker) connections. I’m sharing the part number that includes both the user jack and terminals, as follows: 77023460001 – ...
Types of Wires in IPOT Tester
MCCB/ACB – OCR Tester Part # 72313460410 (TOTAL ASS'Y,IPOT,OCR TESTER) The i-Tester (Intelligent Tester) or OCR Tester is an accessory for testing the trip units on Smart MCCBs, UTS800/UTS1200 MCCBs, and ACBs* without main power. This performs relay ...
OCR to STU Conversions
Understanding LS Electric Trip Units: OCR vs. STU Over the years, LS Electric trip units have gone through several updates and revisions. As a result, there have been changes in both naming and product specifications. LS Electric offers two main ...
DC Disconnect Switch – 1500Vdc Polarity & Current Rating Clarification
1. Polarity – 1500Vdc Model The 1500Vdc DC Disconnect does not require polarity input. This means the positive (+) and negative (-) terminals can be connected without worrying about orientation. This design allows for flexible installation and aligns ...
How to check the rated current of Smart trip unit without a rating plug.
1. For N / A type of Smart Trip Unit, our manager software is needed to check the rated current of the trip unit. - connect your laptop to the trip unit and open the software. Once it is connected, read the factory config to see the rated current. 2. ...
Understanding Accuracy & Burden Representation for CTs ("Metering Accuracy Classifications" vs "Relay Accuracy CTs")
When selecting or reviewing current transformers (CTs), it’s important to understand that the way accuracy and burden ratings are represented differs depending on whether the CT is used for metering or protection purposes. Please see the following ...
Metering CT Specifications for D / E / G Frame ACB
I’m sharing the following Metering CT information to be posted as a knowledge base article. (Please refer to the accuracy class and VA rating. 1. D Frame 2. E Frame 3. G Frame
Older ACB Naming Conventions
The article below explains the meanings of certain acronyms used for older generations of our ACBs. For example, “Y2” refers to a combination of AL1 + AL2 (2b) + MRB, which together make up the alarm accessory for a specific breaker.
ACB Door Frame 3D Cad Drawings (Drawout/Fixed)
3D CAD Files for the Drawout / Fixed ACB Door Frame Item(Drawout)# 64723460501 Item(Fixed) #64723460502 Drawout type: https://drive.google.com/file/d/1TRDLYL8w9rVuR4b14OBw6O0_DpPBROON/view?usp=sharing Fixed type: ...
Modbus Mapping for the Air Circuit Breakers STU (Smart Trip Units)
See the attachment for complete smart trip units (STU) Modbus mapping details for the LS Electric Air Circuit Breakers.
ACB Torque ranges by bolt sizing
Refer to the below TABLE for ACB Torque value for Size of bolt.
ACB Zero Current Transformer accessory
ACB application that requires Zero Current Transformer or "ZCT". Below is from our ACB catalog: IF UL is required, LSEA does not have a ZCT option. The (2) ZCT listed in the ACB catalog do not have a UL certification. Customer shall look into 3rd ...
ACB Interlock ( Key Lock )
The following ACB Interlock options are available. Below shows product description and ITEM #'s:
ACB Door Interlock (DI) Option
Our ACB Door Interlock Mechanism (DI) can be field installed, but with high level of skill. ITEM # 56123460504 Contact LSE Applications support for further information. Below shows Accessory option found on P# 73 in LSE ACB UL Catalog: Below is our ...
Understanding and Replacing Rating Plugs in ACB (Air Circuit Breakers)
What is a Rating Plug? A rating plug is an essential component in an adjustable trip molded case circuit breaker that determines the operational amperage level. It serves as a replaceable part that defines the maximum current the circuit breaker can ...
ACB Rating Plug Changes when involving the change up to our NEW STU OCR only:
ACB Rating Plugs can be changed by customer and purchased separately, with older OCR type. If your project requires our new STU (Smart Trip Unit) Type: The rating plug of the new STU is different from that of the previous OCR. Additionally, changing ...
ACB Ordering Workup Sheet
ACB Barrier Accessory
ACB Temperature Derating Table
The following below shows LSE ACB Temperature Derating Table:
ACB Neutral Current Transformer (NCT) and associated CAD Drawings
ACB NCT that are available for the US market (UL): Attached are the 2D CAD Drawings.
SUSOL (UL) ACB External Configuration Fixed and Draw-out Type
SUSOL (UL) ACB External Configuration Fixed and Draw-out Cradle Type Shown below. Identifies "at a glance" our ACB build summary of terms and their locations.
NEMA Ratings for ACBs with Door Frames and Dust Covers
Problem Overview: Air Circuit Breakers (ACBs) installed in various operational environments require appropriate protective measures compliant with the National Electrical Manufacturers Association (NEMA) standards. It is essential to understand the ...
3D Model of Dust Cover and Door Frame for ACBs
A door frame may be used with ACBs to provide a frame and seal for the circuit breaker, protecting the front portion of the ACB that protrudes out. Refer to the attachments for the stp (3D) files. A dust cover may be used with ACBs to improve the ...
Ground Fault Protection with Susol Air Circuit Breakers
Ground Fault (G) protection is available on Susol Air Circuit Breakers when it is necessary to detect current leaking to ground. Use the current setting knob (Ig) to set the desired ground fault current. Setting range: ...
What is the difference in HC Type and HX Type AUX for ACBs?
HX Type is "off charge" while HC type is "on charge". Both options have 5a5b aux. Simply put, off charge means the motor charges when the breaker opens. On charge means the motor charges when the breaker closes. See below for detailed ordering info ...
What MCCBs and ACBs have the ERMS function?
ERMS( Energy Reduction Maintenance Setting) is a function to reduce the ARC energy to ensure workers' safety. LS Electric MCCBs and ACBs with A Type, P Type, or S Type OCR trip units have ERMS.
ACB/MCCB Voltage Modules
For customers looking at the ACB and MCCB voltage modules they should know that despite the different names they are technically the same part. This applies to the total assembly compact voltage divide module.