Eaton Bussmann LPJ-400SP

LPJ-400SP is a Class J time-delay current-limiting fuse from the Low-Peak series by Eaton Bussmann, specifically designed for high-inrush loads such as motors and transformers.

1. Model Definition

LPJ: Low-Peak™ series, Class J, time-delay

400: Rated current 400A

SP: Special Purpose (industrial/motor protection)

SPI: With blown fuse indicator (optional model: LPJ-400SPI)

2. Key Technical Specifications

3. การใช้งานทั่วไป

Motor circuits (มช), variable frequency drives, หม้อแปลงไฟฟ้า

การกระจายพลังงานอุตสาหกรรม, ยูพีเอส, PV DC circuits

Applications requiring high current limiting, inrush resistance, and nuisance-trip prevention

4. Full Series Models (70–600A)

LPJ-70SP / 80SP / 90SP / 100SP

LPJ-110SP / 125SP / 150SP / 175SP

LPJ-200SP / 225SP / 250SP / 300SP

LPJ-350SP / 400SP / 450SP / 500SP / 600SP

5. Cross-Brand Direct Replacements (400A Class J Time-Delay)

6. การคัดเลือก & Replacement Notes
7. Class J only: Not interchangeable with Class RK5/H/K; must use Class J fuse holders.
8. Time-delay required: Motor circuits must use LPJ/JTD/AJT time-delay fuses; fast-acting types (JKS) are not suitable.
9. Indicator upgrade: Use LPJ-400SPI for status monitoring.
10. DC applications: Rated at 300V DC, suitable for PV and energy storage DC branches.

Application Scenarios of Eaton Bussmann Fuses

With a full, comprehensive, high-performance product portfolio, Eaton Bussmann fuses cover nearly all electrical protection scenarios from low voltage to high voltage, AC to DC, and industry to new energy, providing reliable overcurrent and short-circuit protection for high-value equipment, critical circuits, and hazardous environments.

1. ระบบอัตโนมัติทางอุตสาหกรรม & Traditional Manufacturing (Core Scenario)

Designed for industrial equipment including motors, VFDs, and PLCs, with emphasis on inrush resistance, time-delay, and current limiting to prevent nuisance tripping.

Motor Control Centers (มช) / Motor Circuits

ชุด: LPJ (Class J), LPN-RK (Class RK5), KTK (Class RK1)

แอปพลิเคชัน: Protect three-phase induction motors, gear reducers, แฟน ๆ, ปั๊ม. Time-delay characteristics (≥10s at 500% In for LPJ series) withstand motor starting inrush and prevent tripping during frequent starts/stops.

Variable Frequency Drives & Power Electronics

ชุด: Fast-acting fuses (FWH, FWX), DIN 43653 square body fuses

แอปพลิเคชัน: Protect VFDs, servo drives, ยูพีเอส, rectifiers, soft starters. Fast-acting (aR) fuses clear short circuits in microseconds to safeguard expensive semiconductors such as IGBTs.

Industrial Power Distribution & Transformers

ชุด: NH series, KF series, CM series

แอปพลิเคชัน: Low-voltage switchgear, primary/secondary transformer sides, capacitor banks. Provides overload and short-circuit protection for main and branch circuits with interrupting ratings up to 300kA.

Control Circuits & Precision Circuits

ชุด: FNQ, FNM (Class CC), MDA, MFD

แอปพลิเคชัน: PLCs, รีเลย์, instruments, เซ็นเซอร์, control power supplies. Compact size for precise protection of low-current control circuits.

2. พลังงานใหม่ & Green Power (Fastest-Growing Segment)

Engineered for high-voltage DC, ความน่าเชื่อถือสูง, and explosion protection, covering the entire PV, wind, energy storage, and electric vehicle industrial chain.

Photovoltaic (พีวี) Systems

ชุด: PV series, 10×38 PV fuses, GDC series

แอปพลิเคชัน: PV combiner boxes, string circuits, inverter DC sides, central inverters. Compatible with 1000V/1500V DC systems, resistant to temperature cycles and DC arcing.

Energy Storage Systems (ESS) & Power Batteries

ชุด: EV series, MEV series, 1500V ultra-fast DC fuses

แอปพลิเคชัน: PCS, battery clusters, BMS circuits, containerized ESS. Provides high-voltage DC protection (up to 1500V DC) against thermal runaway and fire risks.

Wind Power Generation

ชุด: Medium-high voltage fuses, special time-delay fuses

แอปพลิเคชัน: Wind turbine pitch and yaw systems, nacelle cabinets, pad-mount transformers. Adapted to high altitude, strong vibration, and wide temperature ranges.

Electric Vehicles (EV) & Charging Infrastructure

ชุด: EV, MEGA, AM, FWH

แอปพลิเคชัน:

Vehicles: Main battery pack circuits, on-board chargers (OBC), PDUs, motor controllers.

Charging: DC fast chargers, battery swap stations. Rated up to 1000V DC, covering 10A–1600A.

3. ศูนย์ข้อมูล & Telecommunications

Ensures 24/7 uninterrupted power supply with high reliability, การสูญเสียพลังงานต่ำ, และการออกแบบโมดูลาร์.

การใช้งาน: UPS input/output, precision air conditioning, server power supplies, telecom base stations, IDC PDUs.

ชุด: KTK, FNQ, LPJ, low-voltage blade fuses

Key Benefits: Strong current limiting, fast fault clearing to prevent single-point failures from spreading; low power loss reduces heat and energy consumption.

4. Petroleum, เคมี, Coal Mining (Hazardous Environments)

Used in flammable gas and dust atmospheres, requiring explosion-proof and flameproof certifications.

การใช้งาน: Explosion-proof motors, flameproof VFDs, oilfield pumping units, chemical reactors, underground coal mine equipment.

ชุด: Explosion-proof certified fuses, Ex d flameproof fuse links

Key Requirements: เอเท็กซ์, IECEx, CQST certified to prevent ignition of external explosive gases.

5. Rail Transit & มารีน

Withstands harsh conditions including strong vibration, ความชื้นสูง, wide temperatures, และฝุ่น.

Rail Transit

การใช้งาน: Traction converters, auxiliary power, signaling systems, door controls for high-speed rail and metro.

ชุด: Fast-acting fuses, special time-delay fuses, ใน 50155 certified products

มารีน & Offshore

การใช้งาน: Marine motors, ปั๊ม, คอมเพรสเซอร์, navigation equipment.

การรับรอง: ABS, DNV, LR marine type approvals, salt-mist and mold resistant.

6. Electric Power Transmission & Distribution (Medium-High Voltage)

Covers full-link protection from power plants to end users.

การใช้งาน: Medium-voltage switchgear, transformer protection, capacitor banks, cable feeders, transformer protection.

ชุด: XRNP (PT protection), XRNM (motor protection), WFN (outdoor)

7. Automotive & Construction Machinery

Conventional Vehicles: ATC/ATO blade fuses, MAXI, MEGA, AMI for lighting, เครื่องปรับอากาศ, ECUs, starters.

Construction Machinery: Electrical systems for excavators, loaders, รถเครน, resistant to extreme temperatures and vibration.

8. Quick Selection Guide (By Application)

1. Industrial Motors / มช / Transformers (For ABB M3JP Explosion-Proof Motors)

แอปพลิเคชัน: Three-phase induction motors, แฟน ๆ, ปั๊ม, คอมเพรสเซอร์, หม้อแปลงไฟฟ้า

Typical series: LPJ (Class J), LPN-RK (Class RK5)

คุณสมบัติ: Time-delay, resistant to motor starting inrush, no nuisance tripping.

2. VFDs, IGBTs, Servos, ยูพีเอส (Power Electronics Protection)

แอปพลิเคชัน: VFD DC links, rectifiers, inverters, servo drives

ชุด: FWH, FWX, 170ม (square body fast fuses)

≤22kW VFDs: FWX-10A, FWX-20A, FWH-30A

45~75kW VFDs: FWH-60A, FWH-80A

≥160kW high-power drives: 170M series 200A~600A

คุณสมบัติ: Ultra-fast aR characteristics, protects expensive semiconductors.

3. พีวี / Energy Storage / High-Voltage DC (1000วี / 1500ในดีซี)

แอปพลิเคชัน: PV combiner boxes, strings, PCS, energy storage battery clusters

ชุด: พีวี, EV, GDC, 10×38 PV fuses

PV strings 15A/20A: PV-15A, PV-20A

Combiner boxes 32A: PV-32A

ESS high-voltage DC: EV-315A, EV-400A, EV-500A

คุณสมบัติ: DC-optimized, arc-resistant, thermal runaway protection.

4. Control Circuits / บมจ / Relays (For Schneider RXM Relays)

แอปพลิเคชัน: Cabinet control circuits, 24V power supplies, instruments, เซ็นเซอร์

ชุด: FNQ, FNM, KTK, MDA

1A~10A control circuits: FNQ-1, FNQ-2, FNQ-5, FNQ-10

Compact terminal block protection: KTK-1, KTK-5

5. Hazardous Explosion-Proof Environments (ปิโตรเคมี, Coal Mining, For M3JP Motors)

แอปพลิเคชัน: Ex d flameproof cabinets, Zone 1/2 hazardous areas

ชุด: LPJ-xxSP with explosion-proof certification, Ex-type fuses

Direct usable models:

LPJ-400SP, LPJ-300SP, LPJ-200SP

Suitable for short-circuit protection in hazardous areas when used with flameproof enclosures.