Terminal block PHOENIX-CONTACT 3031157 — 4-position, grey

PHOENIX-CONTACT 3031157 is a double-level, 4-position grey terminal block designed for secure and compact wiring in control cabinets and industrial panels. The terminal block uses a spring-cage connection method that accepts conductors from 0.08 mm² to 1.5 mm² (AWG 28–16) and mounts on standard NS 35/7.5 or NS 35/15 DIN rails. With a narrow 4.2 mm width per pole, this component supports reliable circuit termination and distribution where space and dependable contact performance are required.

Advantages

The spring-cage connection provides vibration-resistant, maintenance-friendly clamping without the need for tools during conductor insertion, ensuring consistent contact pressure over time. The double-level design enables two-wire connections per pole in a single compact footprint, reducing rail space and simplifying wiring layouts. The grey housing material is suited for standard industrial environments and allows easy visual identification within terminal assemblies.

Suitable for

• Control cabinet wiring and distribution
• Signal and automation applications
• Panel mounting on NS 35/7.5 or NS 35/15 DIN rails
• Compact installations requiring multi-level terminations

Key specifications

• Number of positions: 4 (double-level)
• Connection method: spring-cage connection
• Conductor cross section range: 0.08 mm² – 1.5 mm²
• AWG range: 28 – 16
• Width per pole: 4.2 mm
• Color: grey
• Mounting type: NS 35/7.5 and NS 35/15 DIN rails

How to use

Mount the terminal block onto a compatible NS 35/7.5 or NS 35/15 DIN rail by snapping it into place until it locks. Strip conductors to the appropriate length, then insert the conductor into the spring-cage opening; the clamping mechanism secures the conductor without additional screws. For double-level connections, route the second conductor to the upper or lower level as required, verifying that conductor sizes are within the specified cross-section range. Ensure wiring is performed with the system de-energized and follow applicable electrical safety standards.

Usage recommendations

Use ferrules on fine-stranded conductors to improve contact reliability with the spring-cage connection. Verify conductor sizes and insulation strip lengths before insertion. For installations exposed to vibration or mechanical stress, periodically inspect connections during maintenance intervals to confirm continued clamping integrity.