Mersen 34031T Class T Fuse Block

The Mersen 34031T is a high-performance, single-pole fuse block designed for Class T fuses up to 400 A operating at 300 VAC or 300 VDC. Built for demanding industrial, power, and renewable energy systems, this robust block delivers superior protection and reliability.

Key Features & Benefits

High-Amperage Capacity: Supports Class T fuses up to 400 A for heavy-duty circuit protection

Dual Voltage Rating: Suitable for both 300 VAC and 300 VDC applications

Exceptional Short-Circuit Withstand: Rated for 200 kA SCCR, providing reliable safety under high-fault conditions

Copper Fuse Clips & Box Lugs: High-conductivity copper connectors ensure excellent electrical performance and heat resistance

Durable Phenolic Insulation: Resists high voltage (≥ 2.5 kV dielectric strength) and operates up to 80 °C

Reinforced Clip Design: Handles repeated fuse changes without degradation for long-term use

Mounting Flexibility: Designed for direct screw-panel mounting; torque spec ~68 lb‑in ensures secure installation

DIN-Rail Adapter Ready: Ideal for streamlined control panels (for 30–60 A versions; full line supports various amps)

Compliance & Approval: UL listed, UL recognized component, CSA certified, RoHS and REACH compliant

Technical Specifications

Fuse Class: T

Voltage Rating: 300 VAC / 300 VDC

Current Rating: 400 A

Short-Circuit Rating: 200 kA

Poles: 1

Connector Style: Copper box lugs

Body Insulation: Phenolic

Dielectric Strength: ≥ 2.5 kV

Operating Temperature: –25 °C to +80 °C

Mounting Type: Direct screw-panel (1/4″ screw recommended)

Dimensions: 6″ L × 2.25″ W × 2.99″ H (152 × 57 × 76 mm)

Weight: ~1.6 lb (0.73 kg)

Ideal Applications

Industrial control panels and switchboards

Photovoltaic inverters and energy storage systems

Motor control and distribution systems

OEM machinery, backup power circuits, and retrofit installations

Why Choose Mersen 34031T?

Designed with copper connectors and phenolic insulation, the 34031T offers unmatched electrical performance and safety. Its high SCCR, Class T rating, and compact form make it an ideal choice for environments where reliability and space-saving design matter.

Order & Replacement Notes

Best paired with A3T Class T fuses

Modular add-on blocks (not included) available for multi-pole configurations

Use recommended torque and hardware for proper electrical and mechanical mounting