ESKA Glass Fuse 5×20 – High-Precision Circuit Protection for Sensitive Electronics

The ESKA Glass Fuse 5×20 represents the industry standard in miniature overcurrent protection, designed and manufactured by ESKA, a leading German specialist in fuse technology. Featuring a physical dimension of $5\text{ mm}$ in diameter and $20\text{ mm}$ in length, this small yet critical passive component is engineered to safeguard sensitive consumer, medical, laboratory, and industrial electronic equipment from hazardous short circuits and overcurrent surges.

As shown in the product image above, the ESKA Glass Fuse 5×20 features a highly transparent, cylindrical glass tube housing a precisely calibrated wire filament connected to two nickel-plated brass end caps. The crystal-clear glass body allows for quick and effortless visual inspection to determine if the internal fuse element has melted (blown). This design ensures that when an overcurrent event occurs, the fuse safely interrupts the excessive electrical current, sacrificing itself to prevent costly damage to downstream semiconductors, integrated circuits, and transformer coils.

Key Features of the ESKA Glass Fuse 5×20

Standardized Cartridge Form Factor: Fits perfectly into all standard European $5 \times 20\text{ mm}$ open-fuse clips, inline holders, panel-mount blocks, and drawer-style IEC power entry modules.
Transparent Glass Body: Provides instant visual confirmation of fuse status without requiring a multimeter test.
Highly Calibrated Response Curves: Available in ultra-precise Time-Lag (Slow-Blow / “T”) or Fast-Acting (Fast-Blow / “F”) configurations to suit different load types.
Nickel-Plated Copper Alloy Caps: Promotes outstanding electrical conductivity, low contact resistance, and long-term resistance against oxidative corrosion.
Certified Compliance and Safety Standards: Fully manufactured in accordance with DIN EN 60127-2-3, VDE, UL, and CE safety regulations, ensuring reliable trip times when thresholds are crossed.

Common Applications and Usage

Due to its compact size and highly predictable breaking characteristics, the ESKA Glass Fuse 5×20 is deployed across virtually all sectors of electrical design:

Power Supplies and Adapters: Standard protection on the primary AC inlet side of switch-mode power supplies (SMPS) for computers, chargers, and LED drivers.
Home Appliances and Consumer Electronics: Used inside coffee makers, microwave ovens, audio amplifiers, and televisions to prevent internal faults from drawing excess grid current.
Laboratory and Test Instrumentation: Protects digital multimeters, signal generators, and oscilloscopes from user connection errors or internal surges.
Industrial Control Boards: Embedded within PLC power lines, relay circuits, and solenoid actuator drivers.
Medical Equipment: Safeguards highly sensitive patient monitoring systems and diagnostic equipment where continuous, predictable safety limits are mandatory.

Technical Specifications

The table below details the typical specifications and performance standards of the ESKA Glass Fuse 5×20:

Parameter Specification	Technical Details & Typical Ratings
Component Type	Cartridge Glass Tube Fuse
Primary Target Keyword	ESKA Glass Fuse 5×20
Physical Dimensions	$5.0\text{ mm}$ (Diameter) x $20.0\text{ mm}$ (Length)
Current Rating Range	$32\text{ mA}$ to $20\text{ A}$ (depending on selected model)
Voltage Rating	$250\text{ VAC}$ (Standard) / up to $300\text{ VAC}$
Response Speeds	Fast-Acting (F), Quick-Acting (FL), Time-Lag / Slow-Blow (T)
Breaking Capacity	$35\text{ A}$ to $150\text{ A}$ (at $250\text{ VAC}$ )
Contact Material	Brass, Nickel-Plated End Caps
Manufacturing Standards	EN 60127-2-3, VDE, SEMKO, cURus, CE, RoHS

Installation and Safety Guidelines

Warning: To prevent fire or electric shock, always completely disconnect the main power supply before inspecting, inserting, or removing an ESKA Glass Fuse 5×20.

Match Exact Ratings: When replacing a blown fuse, always match the current rating (Amps), voltage rating (Volts), and speed curve (e.g., replace a “T2A” slow-blow with another “T2A” slow-blow). Replacing a slow-blow fuse with a fast-blow fuse will cause immediate nuisance blowing.

Verify Holder Integrity: Ensure the metal clips on the fuse holder retain high tension. Loose contacts increase circuit resistance, generating localized heat that can prematurely blow the fuse.

Avoid High Voltages: Do not use standard glass tube fuses in environments exceeding $250\text{ VAC}$ to prevent electrical arcing across the blown element.

To review official electrical safety declarations, physical dimension parameters, and complete product datasheets, check the global ESKA-Sicherungen Overcurrent Protection Support Directory.

To request a fast commercial quote or evaluate real-time regional warehouse stock availability for bulk procurement needs, please connect with our sales branch via the Control Qatar Contact Page.