Phoenix 3031225 ST 2,5 BU Feed-Through Terminal Block, Spring-Cage, 2.5 mm², Blue

In control cabinets and distribution boards, electricians rely on the Phoenix 3031225 ST 2,5 BU feed-through terminal block for fast, tool-free wiring. Its spring-cage connection grips solid or stranded conductors from 0.08 to 2.5 mm² without screws, cutting installation time significantly. The blue housing provides clear visual identification for neutral or signal circuits, while the compact design saves space on DIN rails.

Key specifications

• Connection method: spring-cage
• Nominal cross section: 2.5 mm²
• Number of connections: 2
• Number of positions: 1
• Number of levels: 1
• Mounting type: DIN rail NS 35/7,5 or NS 35/15
• Rated voltage (IEC): 800 V
• Rated current (IEC): 24 A
• Rated surge voltage: 8 kV
• Pollution degree: 3
• Overvoltage category: III
• Insulation material group: I
• Flammability rating (UL 94): V0
• Conductor cross section solid: 0.08–4 mm²
• Conductor cross section flexible: 0.08–2.5 mm²
• AWG range: 28–12
• Stripping length: 10 mm
• Insulating material: PA (polyamide)

Why choose it

The spring-cage mechanism maintains constant contact pressure even under vibration, ensuring long-term reliability. The blue colour coding helps prevent wiring errors in complex installations. Its high current rating of 24 A and 800 V voltage rating make it suitable for a wide range of industrial applications.

Ideal use cases

• Control cabinet wiring in manufacturing plants
• Building automation systems
• Power distribution in machinery
• Signal and control circuits

Good to know

This terminal block is part of the Phoenix ST series, known for its push-in connection technology. It is designed for use with copper conductors and can be mounted on standard DIN rails. The polyamide housing provides excellent insulation and mechanical strength, with a flammability rating of V0 for enhanced fire safety.