Transformers
DGA Oil Sample Test Method for a Transformer
DGA oil sampling is done to collect a representative oil sample that contains dissolved gases formed due to internal transformer faults. Equipment Required: Gas-tight glass syringe (50–100 ml) Sampling tube and valve adapter Clean container (for ...
Insulation Resistance Test Procedure for UHV Transformers
An insulation resistance (IR) test for a UHV (Ultra High Voltage) transformer is a critical diagnostic test to assess the health of the transformer's insulation system. It essentially measures how well the insulating materials (like paper, oil, ...
CT Limits of ratio error
According to the IEEE C57.13 standard, a ratio error within ±3% at rated current is considered acceptable, which differs from the NETA testing standard of ±0.5%.
[Technical Inquiry] Can a 15kV Load Interrupter Switch (LIS) be Applied to a 5kV Switchgear?
Customer Question A customer inquired whether a 15kV Load Interrupter Switch (LIS) can be used in a 5kV-rated switchgear. Although the catalog suggests no electrical compatibility issues, we requested internal confirmation regarding mechanical ...
UL 891_3D CAD drawings Interiors_040825
Updated 3D CAD files for the LS Electric UL 891 switchboard interiors. Please click one of the following links for drawing downloads IGS file: https://drive.google.com/drive/folders/1XnuZFxMwgl53I3Cd7XbHE_udIlI3-nox?usp=sharing STP: ...
MTTF Data: Electrical Components
Please refer to the attached MTTF documents for the different LS Electric components such as MCCB, ACB, MCB and various motor protection devices.
UL 489 or UL 1077 in Control Panels and Equipment – A Quick Guide
When to use UL 489 Branch Circuit Breakers and when to use UL 1077 Supplementary Protectors in Control Panels.
Residual Current Circuit Breaker (RCCB) Specifications - Frequency
What frequency is LS RCCB rated for? Answer: The B Type RCCB can be used up to 1000Hz. Our B type RCCB model is RKJ63Hd. Overview of RCCB Types and Ratings RCCBs are safety devices that trip a circuit if they detect a problem with the electric ...
ROHS and REACH Declarations
Attached are the ROHS and REACH Declarations for LS Electric Automation and Electrical Products. This includes... Molded Case Circuit Breaker (MCCB) Earth Leakage Circuit Breaker (ELCB) Miniature Circuit Breaker (MCB) Residual Current Circuit Breaker ...
Trip Unit Tester for MCCBs and ACBs
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 ...
Metasol MT Type Overload SCCR Ratings
Attached is the UL SSCR ratings for the MT type overload relays (OLR).
Acceptable Ring Lug Sizefor BK63HU Mini Circuit Breakers
M5 ring lugs can be used on BK63HU mini circuit breakers but it is advised that the customer check the width of the ring lug. The maximum size of the ring lugs must be less than 13mm. This is shown in the image below. After removing the terminal ...
Slash Ratings for Circuit Breakers
UL Recognized Current Transformers for EMPRs
Though there are many current transformers (CTs) that are recognized by the UL, there are quite a few that are not. Below is a list of CT's for LS EMPRs which are not recognized by the UL.
What is the difference between LTB-32 and TB-32?
LTB-32 and TB-32 are both terminal block accessories for MMS-32AF's. The LTB-32 Item # 62671941111, can be used with a phase bus setup for connecting multiple MMSs to the same power source. LTB Type Phase Bus Setup The TB-32 cannot be used with a ...
Do MCB Busbars include end caps?
Do the UL489 and UL1077 MCB cuttable bus bars include endcaps? Yes, they do include endcaps. Only the 1 meter length cuttable busbars do NOT include endcaps. These cna be ordered seperatley. Example: Item #: 0692001363 (PB-3P12M80A-HUC) includes e ...
Miniature Circuit breaker ring tongue terminals
In addition to bare wires, ring tongue terminals can be used with LS Electric's Miniature Circuit Breakers (MCBs). See the below reocmmended specs.
Are LS Softstarters 2 phase or 3 phase control?
The SSCe, SSCi, and SSMe soft starters control only 2 phases, but included Equi-Vec™ balanced vector control technology. The SSMi series are 3 phase control. Equi-Vec™ balances the output waveform making it symmetrical. This eliminates the previous ...
MCB Temperature Derate
UL489 and UL1077 MCBs are calibrated for a specific ambient temperature. The UL489 BK63HU is calibrated for 40℃. The UL1077 BK63H is calibrated for 25 ℃. The LS MCBs can be installed in an environment from -40 ~70 degrees C. You must follow the below ...
MMS altitude derate
MMS Icu and Ics
– Icu: rated ultimate short circuit breaking capacity. The rated breaking capacity (Icu) is the maximum fault-current a circuit breaker can successfully interrupt safely for one time. functionality is not guaranteed after it interrupts one time. – ...
Are Mini Contactors CSA Certified?
The GMC/GMD series mini contactors are not CSA certified.
How many accessories can I mount on an MCB?
LS Miniature Circuit Breaker (MCB) accessories are always mounted onto the left side. This is due to a mechanical trip pin on the MCB. There is a variety of accessory arrangements which can be mounted to the MCBs. See below combinations for ...
What EMPRs have the Auto-reset function?
GMP series EMPRs with the "A" designator feature an automatic reset function. Reference to the below list of model #s with the auto-reset. Item Code Model 3802009500 GMP22-2PA 1.5A 110/220V 1a1b (Sol) EXP 3802009600 GMP22-2PA 5A 110/220V 1a1b (Sol) ...