LIS
Thermal Dissipation of UL VCB / Cradle / LIS
This Excel sheet provides thermal dissipation (heat loss) data for our UL-certified VCBs with cradles, as well as for our LIS (Load Interrupter Switch) products.
UL VCB Capacitive current switching (UVL, UVM, UVH)
ll LS Electric UL-certified Vacuum Circuit Breakers (VCBs) including the UVL, UVM, and UVH models are rated for C2 class capacitive current switching as per IEEE Std C37.09. This means the breakers are designed and tested to safely switch capacitor ...
MCCB Lug Terminal Compatibility & Order Code Table
This article provides a summary of compatible lug terminals for LS Electric MCCB models, including wire size ranges, material types, and current order codes. Please refer to the attached file below for accurate reference.
Breaker Insertion Handle Misalignment & Close Failure
This article addresses a specific issue reported with breaker insertion handle misalignment and the inability to perform a CLOSE operation. The root cause has been identified, and corrective actions are outlined below for reference and ...
LS UVM Control Schematic Overview – A Type & Q Type
This article provides the control schematic information and key distinctions between the two LS UVM VCB (Vacuum Circuit Breaker) types: A Type and Q Type, both applicable for 5/15/27kV class switchgear. Document No. 77013181004 & 77013181005 Part ...
Visual Inspection Guide for Loading Spring and VCB Contact Wear Indicator
LS Electric ACB Maintenance Manual – Visual Inspection of Loading Spring The VCB Contact Wear Indicator is mentioned in the user manual. The loading spring pressure can be visually inspected to determine the condition of the circuit breaker’s ...
Lead Wire Gauge Used in UL-Certified VCBs (UVL/UVM/UVH Series)
This article explains the lead wire gauge used in LS Electric’s UL-certified Vacuum Circuit Breakers (VCBs), specifically for the UVL, UVM, and UVH series. Applicable Products: UL VCB Series: UVL / UVM / UVH Wire Specification: Wire Gauge: AWG 14 ...
VCB Timing Value(Close-Open operation Timing & Short-Circuit Test Sequence Explanation)
Overview This article summarizes the response to a customer inquiry regarding the timing for a Vacuum Circuit Breaker (VCB) Close-Open operation, especially when simulating a close into a fault (short-circuit) condition. It also explains related ...
VCB Control Circuit Drawing
77013181001 CIRCUIT,CONTROL,UVH-38kV 77013181002 CIRCUIT,CONTROL,UVH-05/15/27kV_ATYPE 77013181003 CIRCUIT,CONTROL,UVH-05/15/27kV_QTYPE 77013181004 CIRCUIT,CONTROL,UVM-05/15kV_ATYPE 77013181005 CIRCUIT,CONTROL,UVM-05/15kV_QTYPE
Does higher ambient temperature affect VCB performance or current rating?
We have a customer site where the ambient temperature can reach up to 50°C during summer, and we’ve been asked whether this may impact the performance of the Vacuum Circuit Breaker (VCB) — specifically the Susol series from LS Electric. After ...
VCB heat loss data
Please refer to the attachment here for VCB heat loss data. thank you
Racking in, out handle for VCB