Fusível CA

RT18 Series Fuse Holder & Fuse Link — 32A / 63A / 125A, up to AC690V

Designed for distribution panels, motor control centers, and commercial power systems. The RT18 family combines high breaking capacity with reliable performance, while compact holders and replaceable fuse links ensure safe installation, easy maintenance, and compliance with IEC 60269.

Sizes: 10×38 • 14×51 • 22×58   Amps: 2–125A   Voltage: AC500/690V (DC250V)

RT18 AC Fuse — Fuse Holder & Fuse Link (32A / 63A / 125A)

Série
Atual
Size
RT18-32 Fuse Link | AC Fuse 10×38
32A • 250V (up to AC690V)
Fuse Link · Specs & Dimensions
RT18-32 Fuse Holder | Panel / DIN
32A • AC690V
Fuse Holder · Specs & Dimensions
RT18-63 Fuse Link | AC Fuse 14×51
63A • AC690V
Fuse Link · Specs & Dimensions
RT18-63 Fuse Holder | Panel / DIN
63A • AC690V
Fuse Holder · Specs & Dimensions
RT18-125 Fuse Link | AC Fuse 22×58
125A • AC690V
Fuse Link · Specs & Dimensions
RT18-125 Fuse Holder | Panel / DIN
125A • AC690V
Fuse Holder · Specs & Dimensions

What Is an AC Fuse (RT18 Series)

The RT18 AC fuse family combines Porta-fusíveis e replaceable fuse links to protect industrial AC circuits against overloads and short circuits. Typical placements include distribution panels, motor control centers, power supplies, and commercial lighting. With up to AC690V rating and 100 kA breaking capacity, RT18 delivers reliable fault interruption while keeping installation compact and service-friendly.

Role in Industrial Protection

  • Primary branch-circuit protection for AC feeders and loads.
  • Back-up protection coordinated with upstream devices (e.g., MCB/Breaker).
  • Fast fault clearing to limit thermal and let-through energy (I²t).

Why RT18 (Holder + Link Ecosystem)

  • Sizes: 10×38 (32A), 14×51 (63A), 22×58 (125A).
  • Mounting: Panel or DIN rail; compact footprint for dense panels.
  • Serviceability: Replaceable links minimize downtime and cost.
  • Coordenação: Trabalha em conjunto breakers/MCBs for selective protection.

Quick Facts

Tensão
AC500/690V (DC250V)
Capacidade de ruptura
up to 100 kA
Atual
2–125A
Form Factor
10×38 • 14×51 • 22×58
Selection help? Talk to an engineer.
DC Fuse (for DC-side protection) • Switch Disconnector • Caixa combinadora fotovoltaica • Get Sizing & Wiring Guidance • IEC 60269 (fuse systems)

Key Features of RT18 AC Fuse

High Breaking Capacity

Rated up to 100kA, clears short circuits quickly and reliably to reduce damage and downtime.

Flexible Mounting

Available as panel-mount or DIN-rail versions for compact boards and control cabinets.

Replaceable Fuse Links

Interchangeable links minimize replacement cost and allow quick service without rewiring.

Standard Compliance

Designed and tested to IEC 60269, ensuring safe integration in industrial AC circuits.

Technical Specifications & Comparison

Compare RT18 fuse holders and fuse links across three standardized sizes. For wiring topologies and replacement tips, see Fiação e instalação.

ModeloTipoSizeAtualTensãoBreaking Cap.MontagemUso recomendadoDocs
RT18-32 Fuse LinkFuse Link10×382–32AAC500/690V (DC250V)up to 100kA— (fits RT18-32 holder)Residential / small control loads diagram: rt18-32-wiring
size: rt18-32-dim
RT18-32 Fuse HolderHolder (Panel / DIN)10×382–32A (with link)AC500/690V—Panel / DIN railCompact boards, retrofits diagram: rt18-32-holder-wiring
size: rt18-32-holder-dim
RT18-63 Fuse LinkFuse Link14×5110–63AAC500/690V (DC250V)up to 100kA— (fits RT18-63 holder)Commercial lighting / MCC panels diagram: rt18-63-wiring
size: rt18-63-dim
RT18-63 Fuse HolderHolder (Panel / DIN)14×5110–63A (with link)AC500/690V—Panel / DIN railC&I boards, control cabinets diagram: rt18-63-holder-wiring
size: rt18-63-holder-dim
RT18-125 Fuse LinkFuse Link22×5830–125AAC500/690V (DC250V)up to 100kA— (fits RT18-125 holder)Heavy-duty feeders / HVAC / PSU diagram: rt18-125-wiring
size: rt18-125-dim
RT18-125 Fuse HolderHolder (Panel / DIN)22×5830–125A (with link)AC500/690V—Panel / DIN railIndustrial mains, large loads diagram: rt18-125-holder-wiring
size: rt18-125-holder-dim
  • Breaking capacity values depend on test conditions per IEC 60269.
  • Replaceable fuse links must match holder size and rating; see model pages for part numbering.
  • For DC-side protection or PV applications, refer to Fusível CC.

How to Select the Right AC Fuse

Choosing the correct fuse ensures safe operation, reduces downtime, and extends equipment life. Consider voltage, current, size, and mounting style before selecting your RT18 AC fuse.

Voltage & Current

Ensure your fuse matches the system voltage (AC500/690V) and load current (2–125A). Oversizing reduces protection, undersizing causes nuisance trips.

Size & Form Factor

Choose the correct fuse body size (10×38, 14×51, 22×58). Compatibility with holders is critical for safe and reliable operation.

Mounting Style

RT18 holders support panel mount ou DIN rail. Select based on your cabinet layout and available space.

Coordenação

Ensure coordination with upstream devices such as breakers ou disconnectors to maintain selectivity and prevent full-system trips.

Installation & Replacement

Follow these best practices to ensure safe installation and quick maintenance for RT18 fuse holders and fuse links. Always comply with local electrical codes and site safety procedures.

Step-by-Step

  1. Isolate power: open upstream breaker/disconnector; verify absence of voltage with a calibrated meter.
  2. Apply LOTO: lockout/tagout per site procedure; display notice at the control point.
  3. Select the correct link: match size (10×38 / 14×51 / 22×58), current (2–125A), and voltage (AC500/690V; DC250V note).
  4. Inspect the holder: check terminals and springs for discoloration, cracks, or looseness; replace damaged parts.
  5. Terminate conductors: strip to spec; insert fully; tighten to the manufacturer’s torque specification.
  6. Insert fuse link: ensure full seating; close/secure the carrier (if applicable).
  7. Re-energize: remove LOTO; close upstream breaker; observe for abnormal heating/odor/noise.
  8. Document: record rating, circuit ID, date, and technician initials for maintenance logs.
Need help choosing the right rating? Talk to an engineer.

Safety & Quick Checks

  • Use PPE: insulated gloves, eye protection; follow site arc-flash labels.
  • Verify size compatibility: holder must match 10×38 / 14×51 / 22×58.
  • Verify amp rating vs. conductor/load; avoid oversizing or undersizing.
  • Check tightening after 24–48h (thermal settling) during commissioning.
  • For recurrent blow, investigate upstream faults or inrush characteristics.

Do & Don’t

Do: match size/amp/voltage; torque to spec; log replacement.
Don’t: bypass/blind link; mix different sizes; reuse overheated holders.
Common mistakes: choosing 10×38 links for 14×51 holders; oversizing amp rating to avoid nuisance trips; loose terminations; skipping LOTO during quick swaps.

Aplicativos e casos de uso

RT18 series protection devices are widely applied in low-voltage distribution, motor control, backup power, and building services.

Fuse holder application in distribution panels

Distribution Panels

Installed in caixas combinadoras or load centers to safeguard feeders, branch circuits, and lighting systems.

Holder used in motor control center cabinet

Motor Control Centers

Back-up short-circuit protection for motor circuits, coordinated with contactors and overload relays inside MCC cabinets.

Fuse links for UPS and power supply racks

Power Supplies & UPS

Protects rectifiers, inverters, and DC circuits against faults, ensuring uninterrupted operation.

Industrial fuse use in commercial building services

Commercial & Public Buildings

Applied in shopping malls, office towers, and transport hubs to protect HVAC distribution and general building services.

Why Choose Us

Factory-direct quality, fast fulfillment, and engineering support for your RT18 AC fuse projects.

ISO 9001 IEC 60269 Compliant CE • RoHS Global Shipping

Direto da fábrica

Stable supply chain and process control ensure consistent quality for RT18 holders and fuse links.

  • Incoming material inspection
  • 100% functional test
  • Traceable lot IDs

Prazo de entrega rápido

Stock on common sizes (10×38 / 14×51) and streamlined logistics for on-time delivery.

  • Priority builds for urgent orders
  • Flexible shipping options

OEM / ODM

Labeling, packaging, and documentation tailored to your project or market requirements.

  • Custom branding & cartons
  • Datasheets & certifications

Engineering Support

Help with selection, coordination, and compliance, from early design to commissioning.

  • Rating & size selection
  • Panel layout guidance
  • Basic coordination notes
Get a Quote or Sample

Resources & Downloads

Access technical resources for RT18 AC fuses, including datasheets, dimension drawings, and application guides.

Datasheet

Complete electrical parameters and performance ratings.

Dimension Drawing

Mechanical sizes for 10×38, 14×51, 22×58 fuse bodies and holders.

Installation Guide

Step-by-step guidance for safe replacement and maintenance.

Product Catalog

Browse Kuangya protection devices including fuses, breakers, and disconnectors.

FAQ — RT18 Series Fuse Holders & Links

1. What is the function of a fuse in AC circuits?
A fuse interrupts the circuit when current exceeds its rated value, preventing overheating, equipment damage, and fire hazards.
2. How do I choose the right fuse rating?
Select based on system voltage, load current, and application. RT18 supports links from 2–125A in 10×38, 14×51, 22×58 sizes.
3. Can RT18 fuse links be used in DC systems?
Yes, selected models are tested for DC250V. For PV 1000V/1500V, use dedicated Fusíveis CC.
4. What’s the difference between a fuse and a circuit breaker?
A fuse must be replaced after a fault, while a breaker can be reset. Fuses respond faster and offer high breaking capacity.
5. Where should a fuse be installed?
Em série with the load, typically on the line conductor. In three-phase circuits, protect each phase as required by local codes.
6. When should fuse links be replaced?
Only after operation due to a fault, or if inspection shows discoloration, deformation, or loose contacts. No routine scheduled replacement needed.
7. Can I oversize the fuse to avoid nuisance trips?
No. Oversizing reduces protection and may allow dangerous fault currents. Match rating to load and cable size for proper coordination.
8. Are RT18 holders universal?
No. Each holder matches its fuse size: RT18-32 (10×38), RT18-63 (14×51), RT18-125 (22×58).