Phoenix ST series spring cage terminal block

Phoenix ST series spring cage terminal block

（1） Product Core Overview

The Phoenix ST series spring cage terminal block is the core product of CLIPLINE's entire series, designed specifically for universal spring loaded conductor contacts. Its core advantage is high contact force, which can achieve anti vibration, airtight, and long-term stable conductor connections, solving the risk of loosening in traditional wiring. The product adopts a compact front connection design, and the connection point can be opened with a standard screwdriver. The conductor automatically contacts after insertion, making it easy to operate; Supports all types of copper conductors with specifications ranging from 0.08-35mm ², can be clamped without pre-processing, and has a large wiring space. The nominal cross-sectional wires can be adapted with wireless noses.

The terminal block is designed to save space as a whole, with conductors entering from the top and compatible with DIN rail installations such as NS 35/7.5 and NS 15, making it suitable for control systems with limited space; Equipped with clear surface markings, each wiring point can be individually identified to improve installation efficiency and reliability; The insulation material is PA, which meets the UL 94 V0 flame retardant rating. The electrical performance complies with the IEC 60947-7-1/7-2/7-3 international standard. Some models have obtained ATEX/IECEx explosion-proof certifications such as KEMA and PTB, and can be used in explosion-proof scenarios.

（2） Product specification division (core parameter table)

The ST series is divided into 7 core specifications based on the rated conductor cross-section. Each specification is compatible with key parameters such as AWG wire gauge, rated current, and stripping length. The core parameters are shown in the table below:

Rated cross-section (mm ²) compatible with AWG wire gauge Rated current range (A) Maximum rated voltage (V) Stripping length (mm) Core compatibility scenario

1.5 28-16 17.5-24 500 8-10 small signal wiring

2.5 28-12 18-31 800 8-10 Conventional signal/low-power power

4 28-10 20-40 800 8-10 medium power power/fuse wiring

6 24-8 30-57 1000 12 high-power power/test wiring

10 24-6 57-70 1000 18 Main circuit branch/installation wiring

16 24-4 76-90 1000 18 large section main circuit wiring

35 14-2 125 1000 25 Extra large cross-section main circuit/distribution wiring

（3） Full range of product types and functions

Based on 7 major specifications, the ST series has derived 12 types of functional terminals, covering the full scenario requirements from basic wiring to specialized functions. The core functions of each type are as follows:

Basic terminals: including straight through, multi conductor (2/3/4 core), multi-layer (2/3/4 layer), and grounding terminals, which are the basic models of various specifications, realizing the straight through, tap off, and grounding of conductors. The grounding terminals are green and yellow in color, in compliance with international standards;

Isolation switch terminals: including isolation switch and knife shaped isolation switch terminals, can easily disconnect circuits, with testing interfaces on both sides of the disconnection point, supports current measurement, and the disconnection handle can be locked in the extreme position for safe operation;

Diode/fuse terminal: The diode terminal is compatible with diodes such as 1N4007 (0.5A/1300V) and 1N5408 (1.5A/1000V) to achieve unidirectional conduction in the circuit; The fuse terminals are compatible with 5 × 20, 6.3 × 32mm fuse cores and C-type flat fuses, some with LED fault indication, and have a maximum rated current of 10A;

Specialized industrial terminals: The starter/actuator terminals (STIO series) are designed with 3/4 cores, suitable for industrial sensor/actuator wiring, and come with 30A power terminals; The installation terminal (STI series) supports dielectric testing with neutral wire continuously open, and requires supporting brackets to fix the busbar;

Desktop terminal (STS series): adopting a bent angle design to minimize the bending radius of the wire, suitable for wiring racks instead of traditional trunking, with a universal disconnect area, and can be adapted to various types of plugs;

Hybrid terminal (STU series): one side is connected by a spring cage and the other side is connected by screws, which meets the internal and external wiring requirements of the equipment, and the compact design saves space;

Test type terminals: Test isolation switch terminals (STME series) with 6 universal functional axes, supporting potential distribution and testing, and can be used to build transformer circuits; The sliding wire test terminal (SGSK/SRTK series) is designed specifically for the secondary circuit of current transformers, and only 2 are needed to build the measurement circuit, saving space.

（4） System attachments and supporting capabilities

The ST series has a complete supporting accessory system, covering all dimensions such as bridging, testing, labeling, protection, and tools. The core accessories and functions are as follows:

Bridge type accessories: including equal diameter bridge (optional for positions 2-50), variable diameter bridge (can connect terminals with different nominal cross-sections, such as ST10+ST2.5/4), and jumper bridge (can lay two potentials in parallel), with bridging current ranging from 24A-57A depending on terminal specifications;

Test accessories: including 2.3mm diameter test plug, 4mm test adapter, modular test plug, all measurement/testing work can be quickly completed; Some terminals come with a universal plug-in area, which can be adapted to P-FIX isolation connectors, P-DI isolation plugs, etc;

Identification and protection category: including center/side groove identification, identification carrier, warning label, supporting clear wiring identification; The partition, end cover, and protective sleeve can achieve electrical grouping isolation and finger contact prevention. The partition protrudes from the terminal contour, providing visual and electrical dual isolation;

Specialized connection class: including COMBI series plug-in terminals, realizing plug-in connection of signal/power, touch safe; Variable diameter bridges, component connectors, etc. can achieve flexible expansion and combination of terminals;

Tools: Equipped with specialized screwdrivers (such as SZF 0-0.4X2.5, SZF 1-0.6X3.5), suitable for operating wiring points with different specifications of terminals, ensuring standardized operation.

（5） Key Performance and Certification

Electrical performance: The rated current ranges from 0.5A (diode terminal) to 125A (35mm ² straight through terminal), the rated voltage is up to 1000V, and the explosion-proof Ex rated voltage is up to 690V; the bridging current varies depending on the terminal specifications, with 24A/17.5A for 2.5mm ² terminals and 41A/32A for 6mm ² terminals;

Mechanical performance: The stripping length increases with the increase of conductor cross-section, from 8mm in 1.5mm ² to 25mm in 35mm ²; the terminal width is 4.2mm-16mm, and the compact design achieves high-density installation;

Certification and Standards: Compliant with international standards such as IEC 60947-7-1/7-2/7-3, UL/CUL, CSA, etc; Some explosion-proof models have obtained certifications such as KEMA 01ATEX2129U, PTB 07ATEX1027U, IECEx, etc., and can be used in hazardous areas;

Installation and Expansion: All terminals are compatible with DIN rail (NS 35/7.5, NS 15) installation, modular design supports up to 50 bit expansion, and terminals of the same shape can be freely combined, with high compatibility of accessories.

（6） Special Design and Advantages

Variable diameter bridge design: It can quickly connect terminals with different nominal cross-sections, enabling flexible construction of power blocks without the need for additional adapters;

Dual function axis: Any number of terminals can be connected through a two position bridge, and a 2-50 position bridge can bridge 50 terminals in one step, improving wiring efficiency;

Hybrid connection technology: The convenience of combining hybrid terminals with spring cages and the reliability of screw connections meet the needs of different wiring scenarios;

Explosion proof and safety: Explosion proof terminals have passed strict ATEX/IECEx certification, with handle locking for disconnect terminals and anti misoperation design for test terminals. The entire series meets the requirements of finger contact prevention;

Busbar support: 10/16/35mm ² installation terminals require supporting brackets, with one set every 20cm, to ensure that the busbar is firmly fixed and improve the stability of high current wiring.