Product Description

Siemens 3NA72520RC SENTRON NH2 LV HRC Fuse Link – 315A 500V AC 120kA

The Siemens 3NA72520RC is a high-performance SENTRON 3NA series Size NH2 Low Voltage HRC (High Rupturing Capacity) fuse link designed for heavy-duty overload and short-circuit protection in low-voltage electrical distribution networks. Featuring a high 120kA short-circuit breaking capacity, a 315A rated current, and a 500V AC voltage rating, this fuse link provides rapid fault clearing to protect cables, switchgear, and industrial machinery from severe electrical damage.

Key Features & Technical Details

• 315A Current & 500V AC Voltage Rating: Engineered for heavy industrial electrical distribution, feeder protection, and main switchboard isolation.

• 120kA High Rupturing Capacity (HRC): High breaking capacity ensures safe fault interruption and protection against extreme short-circuit fault currents.

• Size NH2 Standard Footprint: Standardized blade tag construction designed for seamless fit into Size 2 fuse bases, fuse switch disconnectors, and busbar systems.

• Combined Fault Indicator: Features an integrated visual indicator on top and front for quick, reliable identification of blown fuse status, minimizing troubleshooting time.

• Live Grip Lugs: Equipped with energized metal grip lugs for safe, easy insertion and removal using standard NH fuse pullers.

• High Thermal & Mechanical Stability: Built with a durable ceramic body and silver-plated copper contact blades to ensure low power loss, optimal conductivity, and long-term operating life.

Ideal Applications

• Industrial Switchboards & Main Power Distribution Panels

• Fuse Switch Disconnectors & Busbar Trunking Systems

• Motor Control Centers (MCCs) & Cable Line Protection

• Power Utilities, Transformer Feeder Protection & Renewable Energy Sub-stations

• Heavy Commercial Facilities, Manufacturing Plants & Infrastructure Systems

❓ Frequently Asked Questions (FAQs)

Q1: What is the main application of the Siemens 3NA72520RC HRC fuse?

A: It is designed to provide high-capacity short-circuit and overload protection for electrical power cables, switchboards, and distribution systems in commercial and industrial installations.

Q2: What does the "NH2" size designation mean?

A: "NH" (Niederspannungs-Hochleistung, or Low-Voltage High-Rupturing) refers to the standard DIN blade fuse format. Size NH2 defines the physical dimensions and blade tag spacing required to fit matching Size 2 fuse bases and disconnect switches.

Q3: How do maintenance teams identify if this fuse link has blown?

A: The 3NA72520RC features a combination fault indicator that visually trips on both the top and front surfaces, allowing maintenance staff to quickly spot a blown fuse inside a panel.

Q4: What accessory is recommended for safely replacing this fuse?

A: An insulated NH fuse handle (fuse puller) designed for Size NH00 to NH3 should be used to safely engage the live grip lugs during insertion or removal.

🔗 Compatible Accessories & Cross-Selling Products

• Siemens 3NH1220 / 3NH3220 Series NH2 Fuse Bases: Single-pole or 3-pole ceramic/molded fuse bases for secure mounting of NH2 fuse links.

• Siemens 3NP1 Series Fuse Switch Disconnectors (Size NH2): Panel-mounted busbar and base-mount fuse switches for combined load switching and short-circuit protection.

• Siemens 3NX1013 Insulated NH Fuse Handle (Puller): Ergonomic fuse extraction tool for safe, touch-proof replacement of live NH fuse links.