Phoenix Contact ST 35 High-Current Terminal Block

Technical Overview

High-current feed-through terminal block with spring-cage connection for 2.5-35mm² (12-2 AWG), rated 1000V/125A, and Ex e certified for harsh environments.

Key Features

Spring-cage connection technology.
Accommodates conductor cross-sections from 2.5 mm² to 35 mm² (12-2 AWG).
High current capacity of 125 A.
High voltage rating of 1000 V.
Designed for DIN rail mounting (NS 35/7,5, NS 35/15).
Color: Gray (RAL 7042).
Flammability rating according to UL 94: V0.
Operating temperature range: -60 °C to 110 °C.
Explosion-tested version 'Ex e' (ATEX/IECEx certified).

Technical Specification Matrix

Parameter	Value
Product Type	High-Current Feed-Through Terminal Block
Rated Voltage	1000 V
Rated Current	125 A
Nominal Cross Section	35 mm²
Conductor Cross-section (rigid/flexible)	2.5 mm² - 35 mm²
AWG Range	12 - 2 AWG
Number of Connections	2
Number of Levels	1
Connection Method	Spring-cage connection
Rated Surge Voltage	8 kV
Overvoltage Category	III
Degree of Pollution	3
Insulating Material	PA (Polyamide)
Flammability Rating (UL 94)	V0
Operating Temperature Range	-60 °C to 110 °C
Mounting Type	DIN rail (NS 35/7,5, NS 35/15)
Color	Gray (RAL 7042)
Physical Weight (kg)	0.01
Dimensions L x W x H (cm)	5.9 x 1.6 x 10

Industrial Applications

1. Industrial Control Panels in Harsh Environments

This terminal block provides safe, reliable, and robust high-current connections within industrial control panels. Its Ex e certification allows deployment in potentially explosive atmospheres, while the wide operating temperature range (-60°C to 110°C) and spring-cage connection ensure performance in extreme temperatures and high-vibration settings, thus enhancing operational continuity and personnel safety.

Problem Solved

Ensures secure and reliable high-current power distribution in industrial control panels subjected to explosive risks, extreme temperatures, and mechanical vibrations, preventing connection failures.

High currentHigh voltageHarsh environmentExplosion protectionVibration resistanceSpring-cageATEXIECExWide temperature range

2. Renewable Energy System Power Distribution

The ST 35 is ideal for power distribution within large-scale renewable energy systems, such as solar farms or wind turbines. Its 1000V rated voltage and 125A rated current are suitable for DC power circuits, and the broad operating temperature range (-60°C to 110°C) ensures stable energy transmission in diverse and often exposed climatic conditions.

Problem Solved

Facilitates reliable and efficient high-voltage DC power distribution from renewable energy sources to inverters or collection points, maintaining performance across varied environmental temperatures.

DC power distributionSolar energyWind energyHigh voltageHigh currentOutdoor installationTemperature resilience

3. Heavy Machinery and Equipment Power Connections

Suitable for creating robust electrical connections for motors, heaters, and other high-power components in heavy industrial machinery. Its ability to accommodate large conductor cross-sections (2.5 - 35 mm², 12-2 AWG) and high current (125A), combined with a vibration-resistant spring-cage connection, prevents connection failures common in mechanically stressed or vibrating equipment.

Problem Solved

Provides secure and robust electrical power connections for high-power components in heavy industrial machinery, minimizing downtime by preventing connection issues due to mechanical stress or vibrations.

Heavy machineryPower distributionLarge conductorsHigh currentVibration resistanceSpring-cageIndustrial automation