Phoenix Contact ST 35-PE Protective Conductor Terminal Block

Technical Overview

Ground terminal block with spring-cage connection for 2.5-35mm² conductors, 8kV surge voltage, and ATEX/IECEx certification. Operates -60°C to 85°C.

Key Features

Spring-cage connection for secure and fast wiring.
Green-yellow color for clear protective conductor (PE) identification.
Supports nominal cross sections from 2.5 mm² to 35 mm² (AWG 14-2).
Mounts on NS 35/7.5 or NS 35/15 DIN rails.
High rated surge voltage of 8 kV.
Insulating material (PA) with V0 flammability rating per UL 94.
ATEX/IECEx certified (II 2 GD Ex eb IIC Gb) for hazardous environments.
Operating temperature range from -60 °C to 85 °C.
Compatible with CLIPLINE complete bridging, marking, and testing accessories.

Technical Specification Matrix

Parameter	Value
Product Type	Protective conductor terminal block
Rated Surge Voltage	8 kV
Nominal Current	125 A
Number of Connections	2
Connection Method	Spring-cage connection
Number of Levels	1
Rated Cross Section	35 mm²
Connection Capacity Rigid	2.5 mm² - 35 mm²
Connection Capacity Flexible	2.5 mm² - 35 mm²
AWG Connection Capacity	14 - 2 AWG
Mounting Type	NS 35/7,5, NS 35/15 (DIN rail)
Color	Green-yellow
Insulating Material	PA (Polyamide)
Flammability Rating (UL 94)	V0
Operating Temperature Range	-60 °C ... 85 °C
Temperature Index of Insulation Material (DIN EN 60216-1)	125 °C
Degree of Pollution	3
Overvoltage Category	III
Insulating Material Group	I
ATEX/IECEx Identification	II 2 GD Ex eb IIC Gb
Physical Weight (kg)	0.11
Dimensions L x W x H (cm)	10 x 1.6 x 5.9

Industrial Applications

1. Grounding in Industrial Control Panels for Heavy Machinery

This terminal block is ideal for reliably grounding large industrial motors, power distribution units, and heavy machinery within control panels, protecting personnel and equipment from electrical faults.

Problem Solved

Ensures safe and compliant grounding for high-current applications, mitigating risks associated with 8 kV surge voltages and accommodating large 2.5-35mm² conductor cross-sections typical in heavy industrial environments.

GroundingSurge ProtectionHigh CurrentDIN Rail35mm² conductorIndustrial Safety

2. Protective Earthing in Petrochemical or Chemical Processing Plants (Hazardous Areas)

The ST 35-PE is well-suited for establishing protective earthing connections in control cabinets and junction boxes located in Zone 1 and Zone 2 hazardous areas (gas and dust environments) of petrochemical or chemical processing plants.

Problem Solved

Provides certified explosion protection (ATEX/IECEx II 2 GD Ex eb IIC Gb) for earthing in potentially explosive atmospheres, ensuring safety and compliance in critical process industries.

ATEXIECExHazardous AreaZone 1Zone 2EarthingExplosion ProtectionPetrochemical

3. Grounding in Railway or Transportation Systems exposed to harsh temperatures

This protective conductor terminal block is suitable for grounding circuits in railway signaling, rolling stock, or other transportation infrastructure where equipment experiences wide temperature fluctuations.

Problem Solved

Offers reliable operation in extreme temperatures (-60 °C to 85 °C) and features robust mechanical properties (oscillation/broadband noise and shock tests passed), ensuring continuous safety and functionality in demanding environmental conditions prevalent in transportation.

RailwayRolling StockExtreme TemperatureGroundingVibration ResistanceShock ResistanceTransportation