GFEVT1000‑N‑59E‑Series 1000Vdc Fast‑Acting Square‑Body DC Fuse (100A‑800A, Size2#, aR Class, Non‑Indicator)

GFEVT1000‑N‑59E‑Series 1000Vdc Fast‑Acting Square‑Body DC Fuse (100A‑800A, Size2#, aR Class, Non‑Indicator)

The GFEVT1000-N-59E Size2# is a DC fuse designed as a 1000Vdc non-indicator square-body aR fuse for ESS battery-pack protection. This fuse supports 100-800A with 50kA interrupt rating.

,The GFEVT1000‑N‑59E‑Series is Size2# non‑indicator square‑body fast‑acting DC fuse manufactured by GFEFUSE. Specifically, it rates for 1000Vdc and covers current specifications ranging from 100A up to 800A. Compared with indicator‑type DC fuses, it delivers 50kA interrupting capacity with L/R ≤5 ms condition and minimum breaking‑current of 3In. Furthermore, two terminal configurations are available: ‑BN‑59E bolted flat terminal and ‑UN‑59E DIN fork‑type terminal. Neither variant includes blow‑out indicator; therefore, it suits energy‑storage cabinets, battery‑pack and maintenance safety disconnector short‑circuit backup protection perfectly.

Product Overview

Core Design Purpose

Designed for heavy‑duty 1000Vdc direct‑current circuits, this Size2# non‑indicator square‑body fuse targets short‑circuit backup and maintenance safety disconnector applications for new‑energy power equipment. Besides, its high‑voltage rating allows designers to select smaller, cost‑effective conductors to raise overall system efficiency. In addition, two distinct terminal styles support bolt‑on flat or DIN fork‑type bus‑bar installation layouts.

Fault‑Interrupt Performance

Under severe fault‑current conditions, this fuse can open up to ten times faster than conventional fuse links. As a result, it can effectively protect lithium‑ion batteries, power semiconductors and internal wiring against destructive short‑circuit damage. Moreover, it delivers great ampacity within fixed Size2# outer dimensions with low I²t characteristics.

Environmental & Mechanical Adaptability

This product carries strong resistance against current impulse and wide‑range ambient‑temperature tolerance. Notably, high‑frequency vibration resistance reaches ≥20g acceleration. For cabinet‑mount energy‑storage devices or battery systems, such mechanical performance brings stable long‑term operation. Meanwhile, the time‑current characteristic curve holds accuracy within ±15% current‑direction error.

Key Features & Benefits

In particular, this Size2# compact non‑indicator fuse fits cabinet designs where visual blown‑out indication is unnecessary. It includes these core advantages:

• ✅ Rated voltage 1000Vdc, Size2# square‑body mechanical structure, non‑indicator design (no blow‑out visual alarm)
• ✅ Fast‑acting aR‑class protection; interrupt rating 50kA@1000Vdc (L/R ≤5 ms), minimum breaking‑current ≥3In
• ✅ Dual‑terminal solution: ‑BN‑59E bolted flat terminal; ‑UN‑59E DIN fork‑type terminal, identical electrical performance
• ✅ Wide‑range current portfolio:100A‑800A full‑range specifications
• ✅ Low watt‑loss property reduces extra heat generation inside power cabinets
• ✅ Superior mechanical shock & vibration resistance ≥20g acceleration
• ✅ Optimized for battery‑pack, ESS, DC relay backup & maintenance safety disconnector scenarios
• ✅ RoHS compliant; REACH documentation available upon buyer request

Main Electrical Ratings

Below lists consolidated electrical parameters. Meanwhile, all I²t test conditions run at 50kA @1000Vdc.

Complete Part‑Number Ratings Table

Note：‑BN‑59E and ‑UN‑59E share exactly same electrical performance; difference only lies in terminal geometry, both without blow‑out indicator.

Mechanical Dimensions（Size2#,‑BN‑59E bolted /‑UN‑59E DIN fork‑type, Non‑Indicator）

‑BN‑59E (bolted flat‑terminal): overall max length 147±2.5 mm, body dimension 59±1 mm ×59±1 mm, flat bolted horizontal terminals. Meanwhile, ‑UN‑59E (DIN fork‑type terminal): overall max length 147±2.5 mm, body dimension 59±1 mm ×59±1 mm, customized DIN fork‑shaped terminals. In addition, both versions are non‑indicator type without fuse blow‑out visual mechanism.

Insert two sets of WebP dimension drawings for BN‑59E and UN‑59E.

Application Fields

For instance, power‑system engineers pick this Size2# non‑indicator fuse for compact new‑energy cabinet projects. Main application scenarios are listed as follows:

• Typical New‑Energy Scenarios: Lithium‑ion Battery Pack over‑current & short‑circuit protection
• Energy‑Storage System（ESS / BESS）DC‑side backup protection
• Backup protection for DC relay & DC contactor
• DC maintenance safety disconnector application
• Industrial DC Equipment: DC power cabinet & industrial DC converter protection

Standards & Approvals

First, this fuse references international industry specifications: UL 248.1, UL 248.13; IEC 60269‑1, IEC 60269‑4. Furthermore, most regular current ratings meet RoHS requirements. We supply REACH document release upon formal customer request. In terms of performance, time‑current characteristic accuracy keeps ±15% current‑direction error.

Operating Conditions & Derating Rules

Storage Environment

Product storage temperature: ‑40℃~+120℃; package storage temperature:‑40℃~+80℃. Humidity limits: RH≤70%@40℃, RH≤80%@30℃, RH≤90%@20℃.

Ambient‑Temperature Correction

Standard operating temperature ranges from ‑5℃ ~+40℃. Allowable working temperature covers ‑40℃ ~+85℃. However, users must apply temperature‑derating factor Kt when ambient temperature rises above 40℃. Below ‑5℃, low‑overload pre‑arcing time will extend slightly.

Altitude Correction Ka

Normal installation altitude shall not exceed 2000 m. As altitude rises between 2000‑4500 m, air insulation strength reduces 12‑15% per 1000 m. Therefore, follow formula Ka = 1‑(H‑2000)/100*(0.5/100) for correction.

Continuous‑Current Restriction

As an important installation note: long‑term operating current must stay ≤75% × nominal In.

Insert three charts: temperature‑derating Kt curve, altitude‑derating Ka curve, forced‑air‑cooling Kv curve.

Installation & Conductor Sizing Requirement

Terminal Fastening

Select proper high‑strength bolts to fasten terminals against bus‑bar. You need to guarantee stable low contact resistance under working condition.

Bus‑Bar / Cable Selection

Select copper bus‑bar or conductor cross‑section strictly according to conductor‑sizing reference table inside datasheet.

Mounting Orientation

Horizontal, vertical and tilted installation are all supported. Nevertheless, avoid negative gravity‑vibration impact for connection structures.

Safety Reminders

Important note: This series has no built‑in blown‑fuse visual indicator. Hence, we strongly recommend external fault monitoring devices for fault detection. Do NOT replace fuse under load, unless the system equips dedicated fuse‑disconnector switch. Reserve sufficient insulation clearance between live‑parts and ground. In particular, high‑altitude sites need extra insulation safety margin. Replace any mechanically‑damaged fuse immediately. During regular equipment maintenance, clean dust and oxide layers on conductive contact surfaces.

Frequently Asked Questions

1: What is breaking‑capacity & time‑constant of GFEVT1000‑N‑59E series?

A: Rated breaking‑capacity 50kA @1000Vdc, time‑constant L/R ≤5 ms; minimum breaking‑current ≥3 times nominal rated current (3In).

2: What is difference between suffix ‑BN‑59E and ‑UN‑59E?

A: ‑BN‑59E: bolted flat horizontal terminal; ‑UN‑59E: DIN fork‑type terminal. Both have no fuse‑blown indicator and share Size2# housing & identical electrical parameters.

3: Does this series come with blow‑out indicator?

A: No. GFEVT1000‑N‑59E series are non‑indicator models without visual blow‑out alarm. You should deploy external fault monitoring.

4: What is recommended long‑term continuous operating current?

A: Keep continuous working current under 75% of fuse nominal ampere rating.

5: Which standards does GFEVT1000‑N‑59E comply with?

A: Reference UL248.1 / UL248.13, IEC60269‑1 / IEC60269‑4. RoHS compliant; we provide REACH declaration upon customer request.

6: Is derating required for closed‑cabinet high‑altitude deployment?

A: Yes. For closed cabinets with internal temperature >40℃ above 2000 m altitude, derate rated‑current 2%‑5% per 1000 m elevation. However, open‑air installation generally ignores altitude‑related derating.

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👉 DC Power Fuses > GFEVT1000‑N‑59E Series 1000Vdc Fast‑Acting Non‑Indicator Fuse

Form fields suggestion: Required rated current, Terminal variant choice(BN‑59E bolted / UN‑59E DIN fork‑type), System DC voltage, Cabinet ambient temperature, Working altitude, Application scenario, Order quantity.