Phoenix Contact ST 4-HESI (5X20) Fuse Modular Terminal Block

Technical Overview

Fused DIN rail terminal block, 500V, 6.3A, for 5x20 fuses. Features spring-cage connection for 0.08-6mm² wires. Operates -60°C to 105°C.

Key Features

Simple wiring of very small, flexible conductors.
Easy integration and replacement of fuses with the lever element.
Easy checking of the fuses with integrated test pick-offs.
Enables one-handed wiring.
Reliable vibration resistance thanks to spring-loaded contact elements.
Full flexibility through standardized CLIPLINE complete bridging, marking, and testing accessories.
Compact design with a width of 6.2 mm.
Accepts wire sizes between 28 and 10 AWG for wide compatibility.
Operates in extreme temperatures between -60°C and +105°C.

Technical Specification Matrix

Parameter	Value
Product Type	Fuse modular terminal block
Fuse Type	G - 5 x 20 (Glass / Ceramics)
Nominal Voltage	500 V
Nominal Current	6.3 A
Connection Method	Spring-cage connection
Rated Cross Section	4 mm²
Conductor Cross Section (flexible)	0.08 mm² - 6 mm²
Conductor Cross Section AWG	28 - 10
Mounting Type	NS 35/7,5, NS 35/15 (DIN rail)
Color	Black (RAL 9005)
Operating Temperature Range	-60 °C to 105 °C
Physical Weight (kg)	0.01
Dimensions L x W x H (cm)	7 x 0.62 x 6.15

Industrial Applications

1. Industrial Control Panel Protection in Harsh Environments

This fuse terminal block provides essential overcurrent and short-circuit protection for control circuitry within industrial panels, especially in environments with significant temperature fluctuations. Its compact design facilitates high-density wiring.

Problem Solved

Protects sensitive control components from electrical faults while ensuring reliable operation across a wide temperature range (-60°C to 105°C) often encountered in unconditioned industrial or outdoor enclosures. The spring-cage connections offer vibration resistance for stable operation.

Overcurrent protectionShort circuitIndustrial controlDIN railHarsh environmentWide operating temperatureVibration resistance

2. Machine Tool Circuit Safety

The ST 4-HESI (5X20) is ideal for providing individual circuit protection to various components, such as motors, sensors, and actuators, in machine tools where space is limited and consistent power distribution is critical.

Problem Solved

Offers precise circuit protection for machine tool components up to 500V/6.3A. Its narrow 6.2mm width optimizes space in crowded machine cabinets, and the easy fuse replacement feature minimizes machine downtime, ensuring quick maintenance.

Machine safetyCircuit protectionMotor protectionSensor protectionCompact designRapid maintenance5x20 fuse

3. HVAC System Power Distribution and Protection

This fuse modular terminal block ensures safe and reliable power distribution and protection for Heating, Ventilation, and Air Conditioning (HVAC) systems in commercial and industrial buildings, handling various loads and extreme temperatures.

Problem Solved

Provides robust circuit protection for HVAC control and power circuits up to 500V/6.3A. Its -60°C to 105°C operating temperature range makes it suitable for outdoor rooftop units or plant rooms exposed to harsh weather, while spring-cage technology ensures secure connections despite vibrations.

HVACBuilding automationPower distributionCircuit protectionOutdoor equipmentTemperature resilienceVibration resistance