The main DIN rail terminal block types differ by how they hold the wire. UK and SAK usually use screws. ST uses spring pressure. PT uses a push-in clamp. UT supports higher-voltage screw connections. HT is made for larger aluminum conductors, while PCT uses a small lever.
The letters are product-family names, not one global code. Always check the exact data sheet before ordering.
Why DIN Rail Terminal Blocks Use Model Codes Like UK/SAK
Model codes help makers group products with the same basic design. They also help buyers find matching covers, markers, jumpers, and rail parts.
A code is only a starting point. The same letters may mean different things across brands. Check the connection method, current, voltage, wire range, rail size, and accessories.
With DIN rail terminal blocks explained in plain words, the codes become easier to compare.
UK / SAK Series: Screw-Type
UK and SAK blocks use a screw clamp to hold the conductor. The wire enters the block, then the screw presses the clamp against it.
This style is common in control panels and switchgear. It is easy to understand and simple to check with normal tools.
HYJXH’s SAK terminal blocks mount on standard TH35 rail. The series also supports fixed or plug-in bridges for shared electrical potential.
Use the maker’s torque value. A loose screw can create heat. Too much force can damage the wire or clamp.
The SAK series screw-type DIN rail terminal blocks are designed for reliable conductor connection and potential distribution in low-voltage electrical systems.
INQUIRY NOWST Series: Spring-Type
ST blocks use spring pressure instead of a screw. A tool opens the spring, the wire goes in, and the spring closes around it.
This connection can work well in machines that face vibration. The spring keeps steady pressure on the conductor.
HYJXH’s ST terminal blocks mount on TH35 rail and support plug-in bridges. The range includes standard, twin, multi-level, and PE versions.
PT Series: Push-In Type
PT blocks are made for fast wire entry. A suitable solid wire can often be pushed straight into the terminal.
Stranded wire may need a ferrule first. The exact rule depends on the product.
Push-in blocks can save time when a panel has many repeated connections. They are common in control cabinets, machine panels, and building systems.
The wire must still match the listed size and strip length.
UT Series: 1000V Screw-Type
UT blocks use a screw clamp and are made for higher voltage needs. HYJXH lists UT models with a rated insulation voltage of 1000 V.
The series uses larger creepage and clearance distances than a basic terminal may need. It also supports dedicated plug-in jumpers.
Choose UT only when the circuit calls for it. A higher voltage rating does not replace checks for current, wire size, and panel space.
HT Series: Aluminum
HT blocks are made for larger aluminum or aluminum-copper conductors.
Aluminum wire often needs a larger cross-section than copper for the same current. The terminal must also be approved for that conductor material.
HT can fit feeders, large panel circuits, and power distribution work. Check the wire range, current, and tightening method.
Do not place aluminum wire into a terminal made only for copper.
PCT Series: Lever-Type
PCT connectors use a small lever. Lift the lever, insert the stripped wire, then push the lever down.
This makes wiring and later changes simple. PCT connectors can work in lights, junction boxes, and small control circuits.
However, PCT is usually a compact wire connector, not a standard rail-mounted terminal block. Check the mounting method before adding it to a DIN rail design.
Comparison Table + How to Choose
The following DIN rail terminal block types chart gives a quick view of each family.
| Series | Connection Method | Common Use |
| UK / SAK | Screw clamp | General panel wiring |
| ST | Spring clamp | Machines and vibration areas |
| PT | Push-in clamp | Fast panel assembly |
| UT | 1000V screw clamp | Higher-voltage circuits |
| HT | Screw clamp | Large aluminum conductors |
| PCT | Lever clamp | Compact wire connections |
A DIN rail terminal block types diagram can help when panel space is tight. It can show wire entry, rail position, jumpers, and nearby parts.
DIN rail terminal blocks with jumpers let nearby terminals share one electrical potential. Use only jumpers made for that series and terminal width.
When learning how to use DIN rail terminal blocks, follow this order:
- Turn off and verify the power.
- Mount the blocks on the correct rail.
- Add end clamps to stop side movement.
- Strip each wire to the listed length.
- Insert and secure the conductor.
- Add markers and approved jumpers.
- Check each connection before power returns.
Start with the wire. Check its material, size, current, and voltage. Then look at wiring speed, vibration, panel room, and future service.
FAQ
Are UK and SAK terminal blocks the same?
They use a similar screw-clamp method, but they are separate product families. Their sizes, ratings, and accessories may differ.
Are ST and PT blocks the same?
No. ST uses a tool-opened spring clamp. PT uses a push-in connection for suitable conductors.
Can I mix jumpers from different series?
Do not assume they will fit. The pitch, shape, and rating may differ. Use a jumper listed for the exact family.
Choose the Code That Fits the Wire
The right terminal block family makes a panel easier to build, read, and repair. Screw, spring, push-in, aluminum, and lever designs each solve a different wiring need.
Do not choose by the letters alone. Match the code to the conductor, circuit, rail, accessories, and service needs.
