Phoenix Contact ST 4-PE Spring-cage Ground Terminal Block

Technical Overview

Spring-cage protective conductor terminal block for 0.08-6mm² conductors, 8kV surge voltage, -60°C to 110°C, ATEX/IECEx certified.

Key Features

Direct DIN rail contacting for low-resistance ground connection without additional wiring effort.
Accepts very small and flexible conductors; no cross-section restriction when using ferrules.
Meets IEC 60947-7-2 requirements for protective conductor connections.
Operating range of -60 °C to 110 °C, with ATEX/IECEx certification for hazardous areas (-60 °C to 85 °C).
Compatible with CLIPLINE complete standardized accessories for bridging, marking, and testing.
Tested for railway applications (DIN EN 50155).
Corrosion-free terminal points.
Green-yellow housing.

Technical Specification Matrix

Parameter	Value
Connection Method	Spring-cage connection
Nominal Cross Section	4 mm²
Conductor Cross-section Rigid	0.08 mm² - 6 mm²
Conductor Cross-section Flexible	0.08 mm² - 4 mm²
Conductor Cross-section Flexible, Ultrasound-compressed	0.34 mm² - 6 mm²
Conductor Cross-section with Ferrule	0.14 mm² - 4 mm²
Cross Section AWG	28 - 10
Stripping Length	8 mm - 10 mm
Mounting Type	DIN rail NS 35/7.5, NS 35/15
Rated Surge Voltage	8 kV
Overvoltage Category	III
Degree of Pollution	3
Maximum Power Dissipation	1.02 W
Operating Temperature	-60 °C to 110 °C
Operating Temperature (ATEX/IECEx)	-60 °C to 85 °C
Color	Green-yellow
Insulating Material	PA (Polyamide)
Flammability Rating UL 94	V0
Certifications	CSA, IECEE CB Scheme, KR, ATEX/IECEx (II 2 GD Ex eb IIC Gb)
Number of Connections	2
Number of Positions	2 Position
Physical Weight (kg)	0.01
Dimensions L x W x H (cm)	3.65 x 0.62 x 5.6

Industrial Applications

1. Grounding for Equipment in Explosive Atmospheres

This terminal block provides secure, low-resistance protective earth connections for electrical equipment located in hazardous areas (Zone 1, 2, 21, 22) within chemical processing plants. Its ATEX/IECEx certification ensures compliance with safety regulations for potentially explosive atmospheres.

Problem Solved

Safely and reliably grounds electrical components in environments with flammable gases or dust, preventing static electricity buildup and fault currents which could ignite the atmosphere.

ATEX/IECExII 2 GD Ex eb IIC Gb-60 °C to 85 °CProtective conductorLow-resistance connectionHazardous areaChemical processing

2. Robust Grounding in Railway Vehicle Control Cabinets

The ST 4-PE is ideal for providing reliable grounding connections within the control cabinets and electrical systems of railway rolling stock. Its tested resistance to oscillation, broadband noise, and shock (DIN EN 50155) ensures stable operation under the demanding vibrations and impacts experienced in rail transport.

Problem Solved

Maintains secure and vibration-proof grounding integrity for critical electrical systems in railway applications, where constant motion and shock could compromise standard connections.

DIN EN 50155Oscillation testShock testRailway applications-60 °C to 110 °CGround terminal blockVibration resistance

3. Environmental Resilient Grounding for Outdoor Control Systems

This terminal block offers a robust grounding solution for industrial control panels exposed to extreme outdoor temperatures, such as those found in mining operations or remote pumping stations. The wide operating temperature range (-60 °C to 110 °C) ensures consistent performance without degradation due to thermal stress.

Problem Solved

Provides dependable protective grounding in environments subject to severe temperature fluctuations, safeguarding personnel and equipment in exposed industrial settings.

-60 °C to 110 °CGround terminalOutdoor industrial panelsThermal stabilityMiningRemote infrastructure