Mersen gR Cylindrical Ultra-Fast Fuse 10x38 20A 690VAC

The Mersen gR Cylindrical Ultra-Fast Fuse 10x38 20A 690VAC is a high-performance, full-range protection device engineered specifically for semiconductor applications. Measuring 10x38 mm, this compact fuse provides reliable, high-speed interruption of short-circuit currents, safeguarding sensitive power electronics and industrial electrical systems from damage. Its gR classification ensures it can handle both overload and short-circuit conditions, making it a versatile choice for demanding electrical environments.

Advantages

This ultra-fast fuse offers exceptional reliability by reacting rapidly to electrical faults, which is critical for protecting expensive and delicate semiconductor components. Its robust construction and standardized 10x38 mm form factor allow for easy integration into existing fuse holders and electrical panels. By providing full-range protection, it eliminates the need for multiple protective devices, simplifying system design while maintaining high safety standards for power electronics.

Suitable for

• Semiconductor protection
• Power electronics equipment
• Industrial control systems
• Frequency converters and inverters
• Soft starters and power supplies

When it may not be suitable

This fuse is not intended for general-purpose residential circuit protection or applications where standard time-delay characteristics are required. It is specifically optimized for high-speed semiconductor protection and may not provide the correct response curve for standard motor starting or lighting circuits.

Key specifications

• Dimensions: 10x38 mm
• Rated current: 20A
• Rated voltage: 690VAC
• Fuse class: gR (full-range semiconductor protection)
• Design: Cylindrical

How to use

The fuse should be installed into a compatible 10x38 mm fuse holder or disconnect switch designed for high-voltage applications. Ensure the power is completely disconnected before installation to prevent electrical shock. Insert the fuse firmly into the clips, ensuring proper contact. It is recommended to verify that the circuit current and voltage ratings match the fuse specifications before energizing the system.

What to consider before purchase

• Verify that the 20A rating matches your circuit requirements.
• Ensure the 690VAC rating is sufficient for your system voltage.
• Confirm that your fuse holder is compatible with the 10x38 mm cylindrical form factor.
• Check if the gR class is appropriate for your specific semiconductor protection needs.

Usage recommendations

Always replace the fuse with one of the exact same type, rating, and class to maintain the integrity of your equipment protection. Regularly inspect fuse holders for signs of oxidation or loose connections to ensure optimal performance.