LS BK63N4PC16 Miniature Circuit Breaker

Brand：LS ELECTRIC（Formerly LG Industrial Systems）

Model：BK63N4PC16

Model Decoding

BK63N: Series code for miniature circuit breaker, 63A frame size, 6kA rated shortcircuit breaking capacity

4P: 4pole (3phase + neutral, allpole disconnection)

C: Ctripping curve, instantaneous tripping range 510In (80160A), for general power distribution, lighting and socket circuits

16: Rated operating current In=16A

Core Technical Specifications

Item	Parameter
Rated Current	16A
Number of Poles	4P (all‑pole disconnection)
Tripping Characteristic	C‑curve (thermal‑magnetic trip: long‑delay overload + instantaneous short‑circuit protection)
Rated Operational Voltage	AC400/415V
Rated Short‑circuit Breaking Capacity	6kA (IEC60898‑1)
Mounting	35 mm standard DIN rail
Width per pole	18 mm; overall width 72 mm
Terminals	Screw‑type terminals, max conductor size 25 mm²
Applicable Standards	IEC60898‑1, GB10963
Electrical Endurance	8 000 operating cycles
Available Accessories	Shunt release, auxiliary contact AX, alarm contact AL, residual current module

Typical Applications

Threephase fourwire finalcircuit distribution; building power distribution, control cabinet incoming feeders, generalpurpose fans & pumps, mixed lightingsocket circuits.

Not suitable for directonline heavyduty motor starting; select Dcurve for motor loads.

Related Series Notes

BK63N: 6kA breaking capacity; upgraded model BK63Nb: 10kA high breaking capacity

Tripping options: Bcurve (35In), Ccurve (510In), Dcurve (1020In, for motor loads)

Direct Equivalent Replacements (DINrail mount, same rating)

Schneider Electric: iC65N4PC16 (6kA)
Chint: NXB634PC16
Delixi: CDB6s4PC16

Customs HS Code Reference

Miniature automatic circuit breaker: 85362000 (for voltage ≤1 000 V). Final classification subject to local customs authority.

Secondhand Unit Inspection Checklist

Visual check: No housing cracks or arc burn marks; smooth handle operation; intact DINrail clip.
Continuity test: Use multimeter to verify conduction at ON position and full isolation at OFF position for all four poles individually.
Terminal inspection: No stripped screw threads; no overheating discoloration on copper contacts.
Units that have experienced shortcircuit tripping are not recommended for reuse, as internal arcchamber components may be damaged.

LS ELECTRIC Brand Background

Common name: LS Electric, formerly LG Industrial Systems. Major Korean power & automation manufacturer. The BK63N miniature circuit breaker belongs to its lowvoltage distribution product portfolio.

History Timeline

1974: Originated from Lucky Co., marking the start of LGgroup industrial electrical business.

1987: Renamed Goldstar Industrial Systems, developing high/lowvoltage switchgear and power equipment.

1995: Consolidation of Goldstar Relay & Goldstar Mechanics, formally named LG Industrial Systems, under LG Group. Many legacy engineering drawings in China reference LGbranded circuit breakers from this era.

2005: Group business spinoff; power & cable businesses reorganized into LS Group. LG Industrial Systems rebranded to LSIS, no longer affiliated with LG Group. “LGbranded breakers” transitioned to LSbranded products.

2020: Global brand upgrade to LS ELECTRIC. Official Chinese name: Lexing Electric.

⚠️ Industry note: Legacy LGBKN circuit breakers are the direct predecessor of today’s LS BK63N. They share identical mounting dimensions and are mechanically interchangeable.

Group Profile

LS ELECTRIC is Korea’s largest comprehensive electrical & automation manufacturer.

Headquarters: Anyangsi, Gyeonggido, Republic of Korea; part of LS Group (LS Cable & System, LSNikko Copper are core affiliates).

Two core business segments:

Power Distribution: Miniature circuit breakers (MCB), moldedcase circuit breakers (MCCB), air circuit breakers (ACB), automatic transfer switches, mediumhighvoltage switchgear, transformers. BK63N / BKN series MCBs fall under lowvoltage enduser distribution.
Industrial Automation: PLCs, variablefrequency drives, servo drives, HMI operator panels.

Inhouse accredited power test laboratory. Products certified to IEC, GB, CE, UL. Production sites in Korea, WuxiChina, DalianChina and Vietnam.

Business Development in China

2000: Dalian plant commissioned, market entry into China.

2005: Wuxi manufacturing plant completed. Most LS lowvoltage components sold in China (including BK63N and MCCBs) are manufactured here.

Regional headquarters & R&D center based in Shanghai, with nationwide sales offices and aftersales support. Widely adopted by industrial OEMs, panelbuilders and buildingdistribution projects. Positioned between premium EuropeanAmerican brands and mainstream domestic Chinese brands, delivering competitive costperformance.

Circuitbreaker Product Portfolio (for reference)

BK63N (BKN): 6kA MCB (the BK63N4PC16 referenced above). Direct mechanical replacement for older BKN series.

BK63Nb: Highbreakingcapacity variant, 10kA.

Metasol Series: Moldedcase circuit breakers (MCCB).

Susol Series: Air circuit breakers (ACB) & DCrated moldedcase breakers for newenergy applications.

Market Characteristics

✅ Strengths: Koreanorigin industrial design; mature accessory ecosystem; local Wuxi production delivers better pricing versus EuropeanAmerican competitors; large installed base simplifies maintenance & retrofitting.

⚠️ Notice: Large volumes of used / secondhand LGera dismantled breakers circulate in the market. Units exposed to shortcircuit events should not be reused.

Core Advantages of LS ELECTRIC Circuit Breakers

Covers BK63N MCB, Metasol MCCB and Susol ACB series, compiled from practical fieldengineering feedback.

Excellent CostPerformance

Positioned between premium EuropeanAmerican brands (Schneider, ABB) and mainstream domestic Chinese manufacturers. Wuxilocalized production delivers substantial price advantage over EuropeanAmerican alternatives, with better performance than basiclevel domestic products.

Widely deployed by Koreaninvested factories, equipment OEMs and panelbuilding integrators; favorable bulkprocurement economics.

Comprehensive Ratings & Full Trippingcurve Coverage

MCB portfolio: complete B/C/D tripping characteristics, 163A current range, 1P4P pole configurations. BK63N offers 6kA breaking capacity; BK63Nb reaches 10kA.

MCCB range: 15800A frame sizes, thermalmagnetic / electronic trip units optional. ACBs cover highcurrent maininfeed applications. Complementary RCBO residualcurrent devices and disconnectors complete the product line.

Physical interchangeability between legacy BKN and modern BK63N: no cabinet modification required for retrofit projects, enabling fast field replacement.

Modular Accessory System

MCB compatible accessories: auxiliary contact AX, alarm contact AL, shunt release SHT, over/undervoltage trip OVT, residualcurrent modules. Toolfree clipon mounting without modification to the breaker body.

Metasol MCCB rich accessory offering: auxiliary & alarm contacts, shunt release, motoroperating mechanism, Modbus communication modules for automated powerdistribution systems.

Unified handle height and terminal geometry across the product family for neat cabinet layout and efficient panelbuilder assembly & commissioning.

Complete Certifications for Domestic & Export Projects

Domestic: CCC mandatory certification. International: CE, CB, UKCA; selected models carry UL489 certification. Suitable for domestic projects and equipment export.

Compliant with IEC608981 & GB10963. Widely applied in industrial control cabinets, building distribution, OEM machinery and selected newenergy scenarios.

Reliable Mechanical & Electrical Performance, Good Environmental Adaptability

Highstrength thermoset flameretardant housing, resistant to high cabinetinternal temperatures. Recessedstyle terminals reduce risk of accidental touch and improve wiring safety.

Stable thermalmagnetic trip mechanism with good surgewithstand performance and low nuisancetripping rate. Electrical endurance ≥8 000 cycles, suitable for frequentlyswitched industrial final circuits.

Metasol MCCB breakingcapacity range:1865kA, certain frames up to 85kA for severe shortcircuit conditions. High impulse withstand voltage Uimp=8 kV, rated insulation voltage Ui=1 000 V.

Large Installed Base & Easy Sparepart Sourcing

Widespread deployment dating back to the LGIndustrialSystems era. Large volume of legacy engineering documentation. Ample spotstock and distribution channels simplify maintenance and replacement.

Crossproductline Ecosystem Synergy

LS ELECTRIC supplies PLCs, VFDs and servo drives alongside switchgear. Using fullrange LS components within one control cabinet allows utilization of OEMvalidated protectioncoordination data and reduces misselection risks.

General Selection Notes

Less advanced builtin digital functions versus highend EuropeanAmerican brands. Metering and communication features are limited to MCCB / ACB frames; standard BK63N MCB provides no native smart functions.
Many secondhand dismantled LGera units circulate; devices that have sustained shortcircuit faults shall not be reused.

LS Circuit Breakers — Limitations & Selection Pitfall Checklist

Based on field feedback for BK63N MCB, Metasol MCCB and Susol ACB, for technical review and BOM evaluation.

Productlevel Limitations
Lowergrade smartfunction capability vs top EuropeanAmerican competitors

Standard BK63N MCB has no builtin metering, communication or remote faultsignal output; external accessories are required for remote signalling.

Only highend MCCB variants support Modbus communication and energydata acquisition; basic MCCBs offer pure protection without data upload.

No native IoTenabled smartMCB portfolio, putting LS at a disadvantage for smartdistribution projects.

Limited highbreakingcapacity and specialrating options vs Schneider / ABB

Standard MCB is 6kA; 10kA BK63Nb is a special variant with lower stock availability.

For system shortcircuit levels 50 kA, MCCB selection is constrained. Careful breakingcapacity verification is mandatory for maininfeed circuits in highfaultlevel substations and datacenter environments.

Average performance under lowtemperature and corrosivehumid conditions

No special anticorrosion coating options for saltsprayprone environments such as coastal docks and offshore equipment. Terminal oxidation may occur in persistently damp cabinets; cabinet dehumidification measures are recommended.

Tripcharacteristic drift may occur below −25 °C; not intended for unprotected outdoor extremelylowtemperature applications.

High accessory cost & long leadtime for niche options

Unit prices for shunt releases, motordrive mechanisms and communication modules are relatively high. Fullyaccessorized configurations approach EuropeanAmerican brand pricing. Certain niche accessories are not manufactured at the Wuxi plant and require Koreanorigin supply with extended leadtimes.

Residualcurrent module constraints

BK63N uses clipon external residualcurrent modules (combinedtype RCBO), not monolithic integrated RCBO. Loosening has been reported in highvibration cabinet environments; terminal screws must be fully tightened during installation. Integrated RCBO model offering is limited.

Marketchannel & Versionrelated Risks (Commonfield pitfalls)
Legacymodel coexistence: LGBKN is dimensionally interchangeable but not performanceidentical to BK63N

While DINrail mounting footprint matches, internal arcchamber and tripunit parameters have been revised.

Large volumes of dismantled used LGBKN circulate. Many have endured shortcircuit events with invisible internal arcchamber damage. Do not deploy in new projects; only permit temporary emergency repair use.

Parallelimport / Koreandomesticmarket variants without ChinaCCC certification

Koreanmarketspecific models share nearidentical appearance but lack CCC approval. They will fail Chineseproject acceptance. Always confirm CCCcompliant Chinesemarket versions and avoid Koreanspec greymarket goods.

Counterfeit risk

High sales volume for BK63N creates counterfeitproduct exposure. For lowcost sources, verify CCC certificates, laseretched markings and original packaging anticounterfeiting features.

Aged longtermstock risk

Recommended maximum shelf life for lowvoltage circuit breakers: 810 years. Longterm storage degrades spring tension and plastichousing performance. Avoid overaged surplus stock.

Application & Selection Bestpractice Warnings
Do not apply Ccurve for motorstarting duties without review

BK63N Ccurve instantaneous trip:510 In. Select Dcurve for highinrush directonline motors to prevent nuisance tripping caused by motor starting current.

Understand 4pole neutralpole switching behaviour

BK63N4P provides synchronous fullpole disconnection for the neutral conductor. Do not confuse with 3P+N configurations from older drawings. Full4pole switching is mandatory for circuits with substantial neutralconductor harmonic currents.

Shortcircuitcoordination verification is required

Originalmanufacturer coordination tables apply only when upstream & downstream devices are both LS.

When mixing LS downstream breakers with upstream Schneider / ABB devices, do not rely on OEM coordination tables. Perform manual shortcircuitcoordination calculation to prevent unwanted upstream tripping before downstream devices operate.

Do not use standard ACrated BK63N for DC circuits

BK63N is ACoptimized. Dedicated LS DCrated circuitbreaker variants must be selected for DC applications. Standard ACMCB exhibits drastically reduced DC breaking capacity and shall never be used for DC faultcurrent interruption.