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5PCS SF76E NEC Thermal Fuse - 77°C 10A 250V SEFUSE Temperature Cutoff

Product Overview

Pack of 5 high-quality SF76E thermal fuses designed for overheat protection in electrical appliances and electronic devices. These one-time thermal cutoff devices permanently disconnect the circuit when temperature exceeds 77°C, preventing fire hazards and equipment damage. Essential safety components for appliances, power supplies, and heating equipment.

Key Features

• Precise Temperature Rating: 77°C (170.6°F) activation temperature
• High Current Capacity: 10A rated current
• Voltage Rating: 250V AC
• NEC/SEFUSE Quality: Reliable Japanese-standard thermal protection
• One-Time Protection: Permanent cutoff ensures safety
• Compact Design: Small form factor for easy installation
• Lead Wire Construction: Pre-attached wires for simple soldering
• RoHS Compliant: Environmentally friendly construction

Technical Specifications

• Model: SF76E
• Type: Thermal Fuse (Temperature Fuse)
• Operating Principle: SEFUSE (thermal cutoff)
• Rated Temperature: 77°C ± 3°C
• Rated Current: 10A
• Rated Voltage: 250V AC
• Hold Current: Approximately 5A (continuous)
• Fusing Current: 10A maximum
• Response Time: Fast acting upon temperature threshold
• Wire Gauge: Typically 20-22 AWG
• Wire Length: Approximately 100-150mm (varies by batch)
• Body Dimensions: Approximately 10mm x 5mm (cylindrical)
• Insulation: Heat-resistant sleeve

How Thermal Fuses Work

Thermal fuses contain a temperature-sensitive pellet that melts at the rated temperature (77°C). When the pellet melts, a spring mechanism permanently opens the circuit, cutting off power to prevent overheating, fire, or equipment damage. Unlike resettable fuses, thermal fuses are one-time use devices that must be replaced after activation.

Applications

• Home Appliances:
  • Hair dryers and curling irons
  • Coffee makers and electric kettles
  • Rice cookers and slow cookers
  • Microwave ovens
  • Electric heaters and space heaters
  • Toasters and toaster ovens
• Power Electronics:
  • Switching power supplies
  • Battery chargers
  • Transformers and inductors
  • Motor control circuits
• HVAC Equipment:
  • Furnace controls
  • Boiler safety systems
  • Heat pump protection
• Other Equipment:
  • Industrial machinery
  • Medical equipment
  • Laboratory heating equipment
  • Automotive applications

Package Includes

• 5x SF76E Thermal Fuses (77°C, 10A, 250V)

Installation Guidelines

1. Identify Replacement Need: Check existing thermal fuse for matching specifications
2. Disconnect Power: Always turn off and unplug equipment before installation
3. Remove Old Fuse: Cut or desolder the failed thermal fuse
4. Install New Fuse: Solder new thermal fuse in series with the heating element or circuit
5. Proper Placement: Mount fuse close to heat source for accurate temperature sensing
6. Secure Wiring: Ensure connections are solid and properly insulated
7. Test Operation: Verify equipment functions properly after replacement

Important Safety Information

⚠️ Critical Installation Notes:

• Always match the temperature rating to your application
• Install in series with the load for proper protection
• Position thermal fuse near the heat source to monitor
• Do not bypass or bridge thermal fuses - they are essential safety devices
• Replace only with identical or approved equivalent specifications
• If fuse has blown, investigate and fix the underlying cause before replacement
• Ensure proper ventilation around the thermal fuse

Why Thermal Fuses Are Important

Thermal fuses are mandatory safety devices in many electrical appliances. They provide a fail-safe backup protection system that prevents catastrophic overheating even if thermostats or other controls fail. Regulations in many countries require thermal fuses in heating appliances to prevent fire hazards.

Advantages of SF76E Thermal Fuses

• Reliability: Japanese SEFUSE/NEC quality standards
• Fast Response: Quickly activates when temperature threshold is reached
• Permanent Protection: Cannot be reset, ensuring safety isn't compromised
• Compact Size: Fits in tight spaces within appliances
• Cost-Effective: Affordable safety component
• Universal Application: Suitable for many heating appliances

Specifications Matching Guide

When replacing thermal fuses, match these parameters:

1. Temperature Rating: Must match or be slightly lower (77°C in this case)
2. Current Rating: Must meet or exceed original (10A)
3. Voltage Rating: Must meet or exceed original (250V)
4. Physical Size: Should fit in the same mounting location

Common Symptoms of Blown Thermal Fuse

• Appliance completely dead (no power)
• Heating element won't turn on
• Device worked normally until suddenly stopped
• No blown circuit breakers, power outlet works fine
• Appliance was overheating before failure

Storage and Handling

• Store in cool, dry environment
• Avoid exposing to temperatures above 50°C during storage
• Keep away from moisture and corrosive environments
• Handle wires gently to avoid breaking internal connections
• Do not pre-bend or stress the wire leads excessively

Perfect For

• Appliance repair technicians
• Electronics hobbyists and DIY repairs
• Maintenance professionals
• OEM equipment manufacturers
• Educational institutions
• Home appliance repair
• Industrial equipment maintenance

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Essential Safety Component | 77°C Cutoff | 10A 250V Rating | Pack of 5

Safety First: Always replace blown thermal fuses and investigate the root cause of overheating before restoring equipment to service.