Mersen A2D-R Class RK1 Time-Delay Fuse, 250VAC/250VDC, Blade, SmartSpot Indication

Mersen A2D400R Class RK1 400A Time-Delay Fuse with SmartSpot Indication

The Mersen A2D400R is a Class RK1 time-delay fuse rated 400A at 250VAC/250VDC, engineered for reliable overcurrent protection in demanding industrial and commercial electrical systems. Built with PolyTube insulating material and tin-plated copper blade terminals, it delivers a 200 kA breaking capacity along with SmartSpot indication technology for fast visual status verification. Its dual AC/DC voltage rating and clip mounting make it a versatile, professional-grade choice for coordinated circuit protection.

Key Features

• Ampere Rating: 400A rating supports high-amperage loads with dependable overcurrent protection.
• Fuse Class: Class RK1 performance provides superior current-limiting characteristics and coordination with downstream protective devices.
• Speed Characteristic: Time-delay operation allows temporary overloads while responding quickly to fault conditions, suited to motor and transformer applications.
• Breaking Capacity: 200 kA AC max breaking capacity delivers exceptional fault current interruption capability.
• Dual Voltage Rating: Rated 250VAC and 250VDC (50/60 Hz) for versatile use across AC and DC electrical configurations.
• Indication System: SmartSpot indication enables quick visual identification of fuse status, reducing troubleshooting time.
• Connection Terminal: Tin-plated copper blade terminals with clip mounting ensure secure, corrosion-resistant electrical contact.
• Body Insulating Material: PolyTube construction supports long-term durability.

Certifications & Compliance

• RoHS Compliant

Technical Specifications

• Indication System: Yes
• Indication System Type: SmartSpot®
• Rohs Compliant: Yes
• Ac Max I R Breaking Capacity I1: 200 kA
• Ac Or Dc: AC/DC
• Ampere Rating: 400 A
• Body Insulating Material: PolyTube
• Connection Terminal Material: Tin-Plated Copper
• Connection Terminal Type: Blade
• Frequency Hz: 50/60 Hz
• Fuse Class: Class RK1
• Mounting Method: Clip
• Product Length: 8.63 in
• Product Weight: 1.64 lb
• Rated Voltage Ac Ul: 250 V
• Rated Voltage Dc Ul: 250 V
• Speed Characteristic: Time Delay

Typical Applications

• Industrial Motor Control Centers
• Commercial Power Distribution Systems
• Manufacturing Equipment Protection
• HVAC System Circuit Protection
• Data Center Power Infrastructure
• Process Control Equipment

Why Mersen?

Mersen fuses combine RoHS-compliant, professional-grade construction with proven reliability for coordinated circuit protection. The PolyTube insulating body and tin-plated copper blade terminals support long-term performance, while SmartSpot indication adds operational visibility that helps maintenance teams verify fuse status quickly during professional electrical work.