Push-in or screw terminal - which DIN rail block wins?
DIN rail terminal blocks come with push-in spring, tension-clamp or classic screw connection. This guide compares the three technologies by vibration resistance, wiring time, conductor types and maintenance so you pick the right block for your control cabinet.
View terminal blocksWhat connection technologies do terminal blocks use?
DIN rail terminal blocks organise conductors on the mounting rail and connect them with one of three technologies: screw clamp, tension clamp (frame clamp) and push-in spring. All three meet IEC 60947‑7‑1, but they differ clearly in wiring, vibration resistance and maintenance.
A screw terminal presses the conductor onto the busbar with a screw. The tension clamp spreads the screw force evenly across the conductor through a frame. Push-in uses a preloaded spring that grips the conductor by itself - rigid conductors and ferruled wires simply plug in without a tool.
How to plan terminal rows, marking and potential distribution correctly.
Read the guidePush-in or screw - which is better?
Push-in spring terminals cut up to 70 % of wiring time because rigid conductors and ferruled wires plug in tool-free. Screw terminals still win on very large cross-sections and when thin, fine-stranded conductors are connected without a ferrule.
- Push-in: ideal for series production, machines and plants with vibration.
- Tension clamp: good for mixed conductors, including fine-stranded without ferrule.
- Screw: proven for very large cross-sections and harsh environments.
- Always fit fine-stranded conductors with a ferrule before push-in.
What matters most when selecting?
The decisive factors are conductor type, cross-section range, rated current and the operating environment. Check the terminal's rated cross-section and whether rigid, fine-stranded or ferruled conductors will be connected.
- Rigid conductors and ferrules plug directly into push-in blocks.
- Fine-stranded conductors without ferrule need a tension clamp or lever.
- For test taps choose blocks with a test opening or knife disconnect.
- Ground blocks (green-yellow) contact the mounting rail automatically.
Frequently asked questions
Are push-in spring terminals vibration-proof?
Yes. The preloaded spring keeps the contact force permanently constant and cannot loosen under shock. There is no re-torquing as with screws, which is why they are popular in machinery and plant engineering.
When is a screw terminal still the better choice?
For very large cross-sections above roughly 16 mm², when fine-stranded conductors must be clamped without a ferrule, or when a plant already runs a proven screw system with torque documentation.
Do fine-stranded conductors need a ferrule for push-in?
For tool-free insertion, yes. Fine-stranded conductors are fitted with a ferrule. Without one, the spring is opened with an actuating lever or you choose a tension-clamp terminal.
Which standard covers terminal blocks?
The relevant standard is IEC 60947‑7‑1 for terminal blocks for copper conductors. It defines requirements for cross-sections, current capacity and mechanical contact reliability.
Looking for the right terminal blocks?
We supply push-in, tension-clamp and screw terminals for control cabinets - including jumpers, marking and accessories to IEC 60947-7-1.
Standard-tested
Terminals to IEC 60947-7-1.
Maintenance-free
Spring keeps contact force constant.
Fast wiring
Push-in saves up to 70 % time.
Expert advice
Specialists support your selection.