Overview
Overview
A fuse resistor (fusible resistor) is a safety-rated component that combines the functions of a resistor and an over-current fuse. Under normal operation, it provides a stable resistance value for current limiting, voltage division or in-rush protection. When the circuit experiences abnormal conditions — overcurrent, short circuit or surge — the resistor body opens like a fuse at preset conditions, providing fail-safe protection that prevents damage to downstream circuits and reduces safety hazards. The product is built with flame-retardant coatings and high-reliability materials for excellent thermal stability and safety performance. Widely used in safety-critical electronic circuits including switching power supplies (SMPS), adapters and chargers; home appliances (TVs, power strips, air conditioners, washing machines, etc.); industrial control equipment and power modules; LED drivers and power management; new-energy equipment (charging stations, battery management systems / BMS); instrumentation and telecom equipment.
Key Features
Dual-Function Design
- Combines accurate resistance with fuse-style protection
- Reduces component count and simplifies circuit design
High Safety
- Rapid opening under fault conditions — prevents fire and rupture
- Compliant with multiple safety standards
Excellent Surge Tolerance
- Withstands transient surge currents
- Suitable for power-input and inrush-protection circuits
Flame-Retardant & Robust Construction
- Flame-retardant coating or ceramic encapsulation
- Excellent heat- and fire-resistance performance
Strong Stability
- Low TCR, stable resistance over long-term operation
- Suitable for high-reliability applications
Wide Spec Variety
- Custom power, resistance and fusing characteristics
- Meets diverse application requirements
Applications
Typical Applications
SMPS / Adapters
Home Appliances
Industrial Control
LED Drivers / Power Management
New-Energy Equipment
Instrumentation / Telecom
Compare Fusible Resistor Models
Side-by-side specs for every model in this family — power range, resistance range, tolerance, operating temperature and key applications.
| Specification | Custom Resistancemetal film Resistor | Custom Resistanceoxide-film Resistor | Custom ResistanceFuse Resistor | Custom ResistanceFuse Resistor |
|---|---|---|---|---|
| Product Name | Fuse Resistor / Cartridge Fuse | Fuse Resistor / Cartridge Fuse | Fuse Resistor / Cartridge Fuse | Fuse Resistor / Cartridge Fuse |
| Power Range | — | — | — | — |
| Tolerance | — | — | — | — |
| color-code | — | — | — | — |
| Form Factor | — | — | — | — |
| Operating Temperature | — | — | — | — |
| Packaging | — | — | — | — |
| Applicable Standards | — | — | — | — |
| Service Commitments | — | — | — | — |
| Typical Applications | SMPS / LED Drivers / Adapters / Appliance Control / Industrial Instruments | SMPS / LED Drivers / Adapters / Appliance Control / Industrial Instruments | SMPS / LED Drivers / Adapters / Appliance Control / Industrial Instruments | SMPS / LED Drivers / Adapters / Appliance Control / Industrial Instruments |
| Resistance Range | — | — | — | — |
| Current Range | 2A ~ 40A (2A / 3A / 4A / 5A / 7A / 10A / 15A / 20A / 30A / 40A — 10 ratings) | 2A ~ 40A (2A / 3A / 4A / 5A / 7A / 10A / 15A / 20A / 30A / 40A — 10 ratings) | 2A ~ 40A (2A / 3A / 4A / 5A / 7A / 10A / 15A / 20A / 30A / 40A — 10 ratings) | 2A ~ 40A (2A / 3A / 4A / 5A / 7A / 10A / 15A / 20A / 30A / 40A — 10 ratings) |
| Characteristic Type | 2F Fast-Acting / 2T Time-Delay | 2F Fast-Acting / 2T Time-Delay | 2F Fast-Acting / 2T Time-Delay | 2F Fast-Acting / 2T Time-Delay |
| Cap Material | Nickel (or tin) plated brass | Nickel (or tin) plated brass | Nickel (or tin) plated brass | Nickel (or tin) plated brass |
| body Material | Transparent glass tube / ceramic tube (by series) | Transparent glass tube / ceramic tube (by series) | Transparent glass tube / ceramic tube (by series) | Transparent glass tube / ceramic tube (by series) |
| Lead Wire | tin-plated copper lead wire | tin-plated copper lead wire | tin-plated copper lead wire | tin-plated copper lead wire |
| Fusing Element | Alloy | Alloy | Alloy | Alloy |
| Coating | Epoxy resin | Epoxy resin | Epoxy resin | Epoxy resin |
| body Size | Φ2.7 × 7.3 mm (tolerance ±0.3 / ±1.0) | Φ2.7 × 7.3 mm (tolerance ±0.3 / ±1.0) | Φ2.7 × 7.3 mm (tolerance ±0.3 / ±1.0) | Φ2.7 × 7.3 mm (tolerance ±0.3 / ±1.0) |
| Lead Specs | L 27 mm × Φ0.6 mm (tolerance ±2.0) | L 27 mm × Φ0.6 mm (tolerance ±2.0) | L 27 mm × Φ0.6 mm (tolerance ±2.0) | L 27 mm × Φ0.6 mm (tolerance ±2.0) |
| Pin Strength | Pull 10N · Push 2N · Bend 90° + 5N (1 minute) | Pull 10N · Push 2N · Bend 90° + 5N (1 minute) | Pull 10N · Push 2N · Bend 90° + 5N (1 minute) | Pull 10N · Push 2N · Bend 90° + 5N (1 minute) |
| View details | View details | View details | View details | View details |
Frequently asked questions
How does a fusible resistor differ from a normal resistor plus separate fuse?
A fusible resistor combines current-sensing and overload protection in one part — under sustained overload it opens cleanly to a defined high-impedance state, with no arcing or flame. This saves PCB space, lowers BOM cost and ensures the fault-clearing element is always matched to the resistance value. Typical use: power-supply primary, battery cell sensing, audio amplifier rail.
What time-current characteristics do your fuse resistors have?
Two profiles: fast-acting (F) opens in 1–10 seconds at 4× rated power for transient fault isolation; slow-blow (T) tolerates 5× rated power for 5 seconds before opening, suitable for inrush current. Each curve is published in the datasheet (log-log graph). For mission-critical designs we provide measured opening time at three test currents on request.
How well do fuse resistors withstand surge currents during normal operation?
Slow-blow (T) types tolerate single-pulse surges up to 20× rated power for 100 ms without nuisance opening — sufficient for capacitor inrush in 100 W power supplies. Fast-acting (F) types are not surge-tolerant by design. We characterize surge withstand per IEC 61000-4-5 (1.2/50 µs) up to 1 kV; report data shipped with every order at no charge.
Are fuse resistors recoverable, or one-shot devices?
One-shot — once the resistive element opens, the part must be replaced. This is by design: a fusible resistor must reliably remove power, and a self-resetting device could mask a recurring fault. For applications needing reset capability, consider a PTC thermistor or polymer PTC instead — we can advise on the right approach.
What package and resistance range do your fuse resistors come in?
Axial through-hole 1/4 W to 5 W in 0.1 Ω to 100 kΩ; SMD 0805/1206/2010 from 1/8 W to 1 W in 1 Ω to 10 kΩ. All standard parts comply with UL94 V-0 flame retardancy and meet IEC 60127-7 fuse-resistor requirements. Custom values trimmed to ±5%; specify the fault opening current together with steady resistance when ordering.
Sample Request
Sample Request
Standard samples are provided free of charge in reasonable quantities (shipped within 2–3 business days). Custom samples are delivered within 2–4 weeks. Please use the form on the right to tell us:
- Company and contact details
- Target part number or key specs (power / resistance / package)
- Application scenario and estimated annual volume
- Shipping address and expected delivery date
📧 You can also email us directly at info@resistor-factory.cn / 13650089870
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