Phoenix Contact ST 4 Feed-Through Terminal Block, Spring-Cage Connection, 4 mm², Gray, DIN Rail Mount, 800 V, 32 A

Feed-through terminal block with spring-cage connection technology, engineered for reliable and efficient wiring in industrial control panels and distribution systems. The ST 4 terminal block by Phoenix Contact provides a secure, tool-free connection for solid and stranded conductors, ensuring fast installation and maintenance-free operation over its lifetime.

Advantages

The spring-cage connection system offers vibration-resistant clamping, eliminating the need for periodic retightening. Its compact design saves space on the DIN rail while accommodating a wide range of conductor sizes from 0.08 mm² to 6 mm². The gray polyamide housing is halogen-free and flame-retardant (UL 94 V0), providing excellent mechanical and electrical insulation.

Suitable for

• Industrial control panels and switchgear assemblies
• Power distribution in machinery and equipment
• Building automation and HVAC systems
• Railway and transportation applications
• Any application requiring a reliable feed-through connection on DIN rail NS 35/7,5 or NS 35/15

Key specifications

• Nominal cross section: 4 mm²
• Rated voltage: 800 V (IEC)
• Rated current: 32 A (IEC)
• Connection method: Spring-cage (PUSH-IN)
• Number of connections: 2
• Mounting type: DIN rail NS 35/7,5 or NS 35/15
• Conductor cross section solid: 0.08 - 6 mm²
• Conductor cross section flexible: 0.08 - 4 mm²
• AWG range: 28 - 10
• Stripping length: 10 mm
• Operating temperature: -60 °C to 105 °C
• Pollution degree: 3
• Overvoltage category: III
• Insulating material: Polyamide (PA), flammability rating V0

Recommendations

For optimal performance, use with Phoenix Contact end covers and partition plates to ensure proper insulation and grouping. The ST 4 terminal block is compatible with standard screwdrivers for conductor release, though the spring-cage design allows direct insertion of ferruled conductors without tools.