FERRAZ SHAWMUT TIME DELAY FUSE ATDR12

FERRAZ SHAWMUT TIME DELAY FUSE ATDR12

FERRAZ SHAWMUT TIME DELAY FUSE ATDR12 – Amp-Trap 2000® Class CC Small-Dimension Power Fuse

The FERRAZ SHAWMUT TIME DELAY FUSE ATDR12 (Mersen / Ferraz Shawmut catalog reference ATDR12 / X201914) is a high-grade Class CC time-delay power fuse-link engineered to provide IEC Type 2 “No-Damage” protection for sensitive branch circuit components, small motors, and control electronics. Rated for 12 A continuous duty at 600 VAC and 300 VDC, the FERRAZ SHAWMUT TIME DELAY FUSE ATDR12 delivers superior current limitation and exceptional cycling performance to withstand repetitive motor starting cycles without nuisance openings.

As seen in the product image, the fuse features a durable glass-melamine body equipped with bright tin-plated copper ferrule caps and a Class CC rejection tip. The bold orange high-visibility label allows instant on-site identification during panel assembly or maintenance.

Key Features of the FERRAZ SHAWMUT TIME DELAY FUSE ATDR12

• Motor-Cycling Time-Delay: Engineered with time-delay characteristics optimized for motor starting loads, absorbing high initial current inrush while preventing nuisance fuse tripping.

• High-Level Current Limitation: Rapidly cuts peak let-through current and fault energy during short circuits, protecting downstream relays, contactors, and controllers.

• Rejection-Style Class CC Feature: Features an integrated rejection tip on the ferrule end cap to prevent accidental replacement with lower-rated midget fuses.

• High Interrupting Capacity: Rated for a 200,000 A RMS symmetrical interrupting rating at 600 VAC and 100,000 A at 300 VDC.

• Glass Melamine Construction: Constructed with a high-density, dimensionally stable body filled with high-grade silica for fast arc quenching and thermal resistance.

• Global Safety Certifications: Meets UL 248-4 (Class CC), CSA C22.2 No. 248.4, and CE standards.

Common Applications and Industrial Usage

The combination of small dimensions, current limitation, and time-delay characteristics makes the FERRAZ SHAWMUT TIME DELAY FUSE ATDR12 suitable for industrial control environments:

• Small Motor Branch Protection: Protects small single-phase and three-phase fractional horsepower motors prone to frequent start-and-stop cycles.

• Control Transformers & Power Supplies: Absorbs high magnetizing current spikes when energizing control transformers and DC power supplies.

• Contactors & Motor Starters: Protects electromagnetic contactors, solid-state relays, and overload relays from short-circuit damage.

• Industrial Control Panels (UL 508A): Serves as compact main or sub-branch protection inside industrial control cabinets, heating loads, and HVAC equipment.

Technical Specifications

The operational capabilities, mechanical dimensions, and cross-references for the FERRAZ SHAWMUT TIME DELAY FUSE ATDR12 include:

Installation Guidelines and Best Practices

Safety Precaution: Always de-energize and lock out main supply power before opening panel fuse blocks or replacing cartridge fuses.

• Holder Compatibility: Install only in UL-listed Class CC rejection fuse holders, such as Mersen UltraSafe™ USCC series DIN-rail holders or Class CC fuse blocks.

• Branch Circuit Sizing: When applying for motor branch circuit protection, consult NEC Article 430 tables—typically sizing the fuse up to 175%–225% of full-load motor current (FLA).

• Secure Seating: Verify that the fuse rejection tip seats into the fuse holder’s rejection socket to maintain low contact resistance and prevent local heating.