Phoenix Contact ST 2,5-3L Multi-level Terminal Block

Technical Overview

3-level spring-cage terminal block rated 500V, 20A. Accepts 0.08-4mm² conductors, offering vibration resistance and compact design.

Key Features

Spring-cage design enables one-handed, tool-free wiring of conductors from 0.08 mm².
No cross-section restriction when using conductors with ferrules.
Spring-loaded contact elements provide reliable vibration resistance.
Compact integration of two separate circuits in one block saves significant panel space.
Full compatibility with standardized CLIPLINE complete bridging, marking, and testing accessories.

Technical Specification Matrix

Parameter	Value
Nominal Voltage	500 V
Nominal Current	20 A
Maximum Load Current	28 A (with 4 mm² conductor)
Rated Surge Voltage	6 kV
Number of Levels	3
Number of Connections	6 (2 per level)
Connection Method	Spring-cage connection
Nominal Cross-section	2.5 mm²
Conductor Cross-section Rigid	0.08 mm² - 4 mm² (28 - 12 AWG)
Conductor Cross-section Flexible	0.08 mm² - 2.5 mm²
Stripping Length	8 mm - 10 mm
Color	Gray
Insulating Material	PA (Polyamide)
Flammability Rating	UL 94 V0
Operating Temperature	-60°C to 110°C
Mounting Type	NS 35/7.5, NS 35/15 DIN rail
Physical Weight (kg)	0.02
Dimensions L x W x H (cm)	9.95 x 0.52 x 6.55

Industrial Applications

1. Industrial Control Panel Wiring

This multi-level terminal block is ideal for high-density wiring in industrial control cabinets, efficiently managing multiple signal or power circuits within a limited footprint. Its 500V/20A rating and compact 5.2 mm width enable optimized panel design.

Problem Solved

Solves the challenge of maximizing wiring density and organizing complex circuits in space-constrained industrial control panels.

Control cabinetHigh-density wiringSpace-saving500V20ADIN rail

2. Railway Vehicle Power and Signal Distribution

With an operating temperature range of -60°C to 110°C, vibration resistance from its spring-loaded contacts, and compliance with DIN EN 45545-2 for rail applications, this terminal block is perfectly suited for robust power and signal distribution in railway vehicles, ensuring reliable connections under extreme environmental conditions and mechanical stress.

Problem Solved

Ensures reliable and safe electrical connections in railway applications that demand high vibration resistance and wide operating temperature tolerances.

Railway applicationsVibration resistanceWide temperature rangeDIN EN 45545-2Signal distributionPower distribution

3. Machine Building with Critical Space Constraints

In machinery where every millimeter counts, this 3-level terminal block combines multiple circuits in a mere 5.2 mm width, significantly optimizing panel layout. The tool-free, spring-cage wiring simplifies installation and maintenance, while providing stable, vibration-resistant connections for dynamic machine environments.

Problem Solved

Provides a compact and robust solution for electrical connections in machinery with limited space, simplifying installation and ensuring operational stability despite vibrations.

Machine buildingSpace optimizationSpring-cage connectionVibration resistanceTool-free wiring