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GE 9F62DCB200NSFS
Product Name: 5.5 kV Ferrule Mount Transformer Fuse (Type EJO-1, DCB Series)
Introduction: The 9F62DCB200 is a medium-voltage, current-limiting fuse from GE’s 9F62 series (now manufactured by Mersen under the Amp-Trap® brand). It provides overload and short-circuit protection for transformers and distribution lines up to 5.5 kV. The “NSFS” suffix typically denotes specific mounting or indication options per GE nomenclature.
Detailed content
Technical Specifications:
- Manufacturer: General Electric (currently Mersen Amp-Trap®)
- Series: 9F62, DCB Series
- Type: EJO-1, General Purpose (g) Function Class
- Rated Voltage: 5500 V AC (5.5 kV)
- Frequency: 50/60 Hz
- Ampere Rating: 200 A
- Max Interrupting Rating: 80 kA (I₁)
- Mounting: Ferrule mount (spring-reinforced clips)
- Connection Terminal: Silver-Plated Copper, Ferrule type
- Product Diameter: 3 in (Size D barrel)
- Product Length: 15.88 in
- Body/Insulating Material: Epoxy (filament-wound)
- Visual Indicator: Yes (Visual Indication System)
- RoHS Compliant: Yes
- Product Weight: 8 lb
Functional Features:
- Current-limiting operation: melts at currents as low as 1.7× rated current
- Withstands transformer magnetizing inrush current
- Non-venting for silent operation
- Blown-fuse visual indicator for positive identification of open fuse
- UL listed for compatibility with UL listed equipment
Structural Characteristics: The fuse features a notched-ribbon fusible element with patented notch configuration, running considerably cooler than wire elements. It uses quartz sand filler and is housed in a filament-wound epoxy body. The ferrule connections are silver-plated copper.
Working Principle: When fault current flows, the notched-ribbon element melts at the reduced cross-section notches, creating an arc that is quenched by the quartz sand filler, limiting the let-through energy (I²t) to protect downstream equipment.
Installation Requirements:
- Mount in spring-reinforced clips designed for ferrule-type fuses
- Ensure proper clip tension for reliable electrical contact
- Follow ANSI/IEEE C37.40 standards for installation
- Verify continuous current rating equals or exceeds maximum expected continuous current
Usage Notes: These fuses are designed for protection of up to 5.5 kV transformers and distribution systems. They should not be applied solely as overload protection devices. Suitable for indoor/outdoor applications. The blown-fuse indicator provides visual confirmation of fuse operation.
