Phoenix Contact ST 2,5-PE Spring-cage Ground Terminal Block

Technical Overview

Spring-cage protective conductor terminal block, 2.5 mm², supports 0.08-4 mm² conductors, rated 8 kV surge, operates -60°C to 85°C. UL 94 V-0.

Key Features

Simple wiring of very small, flexible conductors.
No restriction on cross-sections when using conductors with ferrules.
Meets requirements of DIN EN 60947-7-2 or IEC 60947-7-2 for protective conductor connections.
Direct contacting with the DIN rail.
Full flexibility due to standardized CLIPLINE complete bridging, marking, and testing accessories.
Tested for railway applications, including shock and oscillation resistance (DIN EN 50155).
Corrosion-free terminal points and low contact resistance.
Additional labeling options available.

Technical Specification Matrix

Parameter	Value
Number of Connections	2
Number of Levels	1
Nominal Cross Section	2.5 mm²
Conductor Cross Section (Rigid)	0.08 mm² - 4 mm² (AWG 28 - 12)
Conductor Cross Section (Flexible)	0.08 mm² - 2.5 mm² (AWG 28 - 14)
Connection Method	Spring-cage connection
Color	Green-yellow
Insulating Material	PA (Polyamide)
Flammability Rating	UL 94 V-0
Rated Surge Voltage	8 kV
Degree of Pollution	3
Overvoltage Category	III
Insulating Material Group	I
Ambient Temperature (Operation)	-60 °C ... 85 °C
Mounting Type	DIN Rail (NS 35/7,5, NS 35/15)
Stripping Length	8 mm ... 10 mm
Shock Protection	Back of the hand protection, finger protection guaranteed (DIN EN 50274)
ATEX/IECEx Certified	II 2 GD Ex eb IIC Gb
Physical Weight (kg)	0.01
Dimensions L x W x H (cm)	4.85 x 0.52 x 3.65

Industrial Applications

1. Railway Signaling and Control Systems

This terminal block is ideal for grounding critical electrical circuits within railway signaling and control cabinets. Its robust construction, wide operating temperature range (-60°C to 85°C), and proven resistance to shock and broadband noise (DIN EN 50155) ensure reliable protective earth connections in demanding rail environments.

Problem Solved

Provides a secure, low-resistance ground connection for safety-critical railway systems, preventing electrical hazards and ensuring equipment functionality under vibrations and extreme temperatures, meeting stringent railway standards.

DIN EN 50155Railway applicationsGroundingVibration resistanceSurge protection-60°C to 85°C

2. Industrial Machine Control Panels (Harsh Environments)

The ST 2,5-PE is well-suited for grounding motor control circuits, sensors, and actuators in industrial machinery operating in challenging conditions. Its durable PA insulating material (UL 94 V-0 flammability rating) and spring-cage connection method provide secure, vibration-proof connections, while accommodating various wire sizes (0.08 mm² to 4 mm²).

Problem Solved

Establishes reliable ground integrity in industrial control panels susceptible to vibrations, temperature fluctuations, and potential fire risks, ensuring operational safety and compliance with industrial standards.

Machine buildingVibration-proofUL 94 V-0Spring-cage connectionGround terminal0.08-4 mm² cross-section

3. Process Automation Systems (Hazardous Areas - ATEX/IECEx)

With ATEX/IECEx certification (II 2 GD Ex eb IIC Gb), this protective conductor terminal block is suitable for grounding in process automation systems located in potentially explosive atmospheres. Its spring-cage technology ensures reliable, maintenance-free connections, critical for safety in such environments where sparks or loose connections could be catastrophic.

Problem Solved

Provides certified protective grounding for equipment within hazardous (Ex) areas, minimizing the risk of ignition from electrical faults and ensuring safe operation of process automation components.

ATEX/IECEx certifiedEx eb IIC GbHazardous areasProcess industryProtective earthingSpring-cage