Phoenix Contact TB 4-HESI (5X20) I Fuse Terminal Block

Technical Overview

Fuse terminal block for G/5x20 fuses, 500V/6.3A, screw connection for 0.5-6mm² conductors, DIN rail mount, -60°C to 110°C.

Key Features

Screw connection method ensures reliable and secure wire termination.
Accommodates a broad range of conductor cross sections: 0.5 mm² to 6 mm² (rigid) and 0.5 mm² to 4 mm² (flexible).
Designed for versatile mounting on NS 35/7,5, NS 35/15, or NS 32 DIN rails.
Rated for 500 V nominal voltage and 6.3 A nominal current (current dependent on fuse).
Constructed with durable PA insulating material, offering a UL 94 V0 flammability rating.
Operates reliably across a wide temperature range from -60 °C to 110 °C.

Technical Specification Matrix

Parameter	Value
Product Type	Fuse Terminal Block
Fuse Type	G / 5 x 20
Nominal Voltage	500 V
Nominal Current	6.3 A
Connection Method	Screw Connection
Rated Cross Section	4 mm²
Conductor Cross Section (rigid)	0.5 mm² - 6 mm²
Conductor Cross Section (flexible)	0.5 mm² - 4 mm²
AWG Cross Section	20 - 10
Mounting Type	DIN Rail (NS 35/7,5, NS 35/15, NS 32)
Color	Dark Gray (RAL 7043)
Operating Temperature Range	-60 °C ... 110 °C
Flammability Rating (UL 94)	V0
Overvoltage Category	III
Degree of Pollution	3
Rated Surge Voltage	6 kV
Insulating Material	PA
Physical Weight (kg)	0.01
Dimensions L x W x H (cm)	5.8 x 0.82 x 4.8

Industrial Applications

1. Overcurrent Protection for Industrial Control Circuits

This fuse terminal block is ideal for integrating individual circuit protection for control signals or low-power loads within industrial control panels. Its 500V/6.3A rating and G/5x20 fuse compatibility allow for precise protection against overcurrents and short circuits, preventing damage to sensitive components or system downtime.

Problem Solved

Prevents overcurrent damage to individual control circuits, ensuring system reliability and safety in industrial environments.

Overcurrent protectionShort-circuit protectionControl panelsG/5x20 fuse500V6.3A

2. Localized Fuse Protection for Machine Safety Interlocks

Utilized at points where local circuit protection or easy fuse replacement is needed for machine safety interlock systems or auxiliary equipment. The screw connection ensures vibration-resistant termination, and its compact dimensions allow for installation in confined spaces near machinery, facilitating quick maintenance and enhancing operational safety.

Problem Solved

Provides accessible and reliable localized overcurrent protection for machine safety circuits, simplifying troubleshooting and fuse replacement.

Machine safetyInterlocksLocal protectionFuse replacementScrew connectionVibration resistance

3. Fused Power Distribution in Distributed I/O Systems

Applicable for fusing power lines in distributed sensor and actuator networks on a DIN rail, especially in environments requiring robust connectivity and moderate voltage/current. The 0.5-6 mm² conductor range supports various wiring needs, and the wide operating temperature ensures stable performance in diverse industrial conditions.

Problem Solved

Safely distributes fused power to multiple field devices, protecting each branch circuit from faults and enabling selective troubleshooting without affecting the entire system.

Distributed I/OSensor networksActuator powerDIN railBranch circuit protection0.5-6 mm² conductors