SIBA 189140 aR Fuse, 12.5A 500VAC/500VDC, Ultrafast Semiconductor Protection, Ceramic, 6.3x32mm - Pack of 10

SIBA 189140 aR Fuse, 12.5A 500VAC/500VDC

The SIBA 189140 aR Ultrafast Fuse is specifically engineered to provide superior protection for power semiconductors, offering exceptional reliability and rapid fault clearing in demanding electrical systems. This robust ceramic fuse, with a current rating of 12.5A and a voltage rating of 500VAC/500VDC, is designed to interrupt fault currents extremely quickly, thus preventing costly damage to sensitive components like diodes, thyristors, and IGBTs. Its compact 6.3x32mm cylindrical body with silver-plated end caps ensures easy integration into various applications and reliable electrical contact.

Key Features:

• Ultrafast Protection: Features an "aR" characteristic, providing fast-acting, partial-range current limiting protection specifically for power semiconductors.
• High Breaking Capacity: Capable of clearing fault currents up to 100kA at 500VAC/500VDC, ensuring system safety during severe overcurrent conditions.
• Dual Voltage Rating: Suitable for both AC (500V) and DC (500V) applications, offering versatility in design.
• Low I²t Values: Designed to have very low melting integral (I²t), which minimizes the energy let-through during a short circuit, crucial for protecting vulnerable semiconductors.
• Low Power Losses: Efficient construction results in minimal power dissipation, contributing to cooler operation and energy efficiency.
• Robust Ceramic Construction: High-quality ceramic body provides excellent insulation and thermal stability, even under extreme conditions.
• Standard Size: Cylindrical 6.3x32mm dimensions are widely compatible with standard fuse holders.

Detailed Technical Specifications:

Electrical Characteristics:

• Manufacturer: SIBA
• Part Number: 189140 (for 6.3x32mm series)
• Rated Current (IN): 12.5A
• Rated Voltage (VAC): 500V AC
• Rated Voltage (VDC): 500V DC
• Fuse Characteristic: aR (Ultrafast, Partial Range Breaking Capacity for Semiconductor Protection)
• Breaking Capacity (Interrupting Rating): 100kA @ 500VAC, 100kA @ 500VDC, L/R = 15ms
• Melting Integral (I²t) @ 500V: Approximately 11.5 A²s (for 12.5A rating, values vary slightly by specific variant or publication batch, typical for the series and current).
• Rated Power Dissipation: Approximately 0.8W (at rated current, typical).
• Operating Temperature Range: -40°C to +85°C (storage and operation without derating).

Mechanical Specifications:

• Body Material: Ceramic
• End Caps: Silver-plated brass
• Dimensions (Diameter x Length): 6.3mm x 32mm
• Mounting: Cylindrical, designed for standard fuse clips or fuse holders

Standards & Compliance:

• International Standard: IEC 60269-1, IEC 60269-4 (Fuses for the protection of power semiconductors)
• Certification: RoHS Compliant

Applications:

This SIBA Ultrafast Fuse is indispensable in a wide array of applications where the rapid protection of power electronics is critical:

• Protection of costly power semiconductors (diodes, thyristors, IGBTs, MOSFETs)
• Industrial power supplies (AC/DC converters, DC/DC converters)
• Inverters and motor drives
• Uninterruptible Power Supplies (UPS)
• Renewable energy systems (solar inverters, wind power converters)
• Heating and cooling control systems
• Industrial control equipment

This product is supplied as a pack of 10 units.