What Is a Mini Terminal Block End Stop? Use and Selection Criteria
A mini terminal block end stop is a small fixing part fitted to the ends of a row of mini terminal blocks to stop the terminals sliding along the mounting rail.
A mini terminal block end stop (mini end stop and terminator) is a small fixing part fitted to both ends of a row of mini terminal blocks to stop the terminals sliding along the mounting rail. It is used to hold groups of mini terminal blocks in place in tight control panels, junction boxes and small machine-mounted panels. Without an end stop, the terminals slide along the rail with vibration or while conductors are being connected, and the order of the row is lost.
Mini end stops and similar parts
| Part | Function | In the catalogue |
|---|---|---|
| Mini end stop and terminator | Holds a row of mini terminal blocks on the rail at both ends | Onka MPK, screwless, 8 colours |
| Standard end stop | Holds a row of rail terminal blocks; its body is larger | Onka MRK-OPK series; for the MPK rail-mount and base-mount models in the End Stops and Terminators category, check mini-row use in the datasheet |
| End plate | Covers the open side of the last terminal; does not hold the row on the rail | Separate accessory |
Selection criteria
- Terminal series: The mini end stops in the catalogue are made for Onka MPK series mini terminal blocks. Before using them with the Onka MP push-in mini terminal blocks in the same category, check compatibility in the Onka data sheet.
- Rail profile: Check in the product data sheet that the end stop fits the rail profile in your panel.
- Mounting: The screwless model fits onto the rail without tightening a screw.
- Colour: Colour does not change the mechanical function. The mini end stops come in the same 8 colours as the MPK mini terminal blocks (beige, grey, brown, red, blue, yellow, black, green) and are chosen to match the row or to tell groups apart.
- Quantity: Each row needs at least two end stops. If the row is divided into several circuit groups, end stops can also be added at the group boundaries.
Common mistakes
- Fitting an end stop at one end only: The row slides the other way.
- Fitting a standard end stop to a mini row: The large body takes up space in a tight area and does not sit properly against the mini terminal. The small end stop of the Onka MRK-OPK series is not a mini terminal end stop either.
- Fixing without pressing the terminals together: The end stop should be fitted after the terminals have been pushed together without gaps; a gap lets the row move.
- Using the end stop instead of an end plate: On terminals with an open side, the side of the last terminal must be covered separately.
Mini end stops in the catalogue
There are 8 active products in the Mini End Stops and Terminators category; all are Onka MPK series screwless mini end stops, each colour with its own stock code (1060084–1060091), sold per piece on quotation. Compatible terminals are in the Mini Spring Connection Terminal Blocks category (17 Onka products: MPK 9, MP 8). For standard rail terminal rows, see the End Stops and Terminators category.
Frequently asked questions
Which terminal blocks is a mini end stop used with?
The Onka mini end stops in the catalogue are for MPK series mini terminal blocks. Before using them with other series, check the manufacturer's compatibility information.
Can a standard terminal end stop be used on a row of mini terminal blocks?
It is not recommended. A standard end stop's body is made for larger rail terminals; on a mini row it takes up space and may not sit properly against the terminal.
How many end stops does a row of mini terminal blocks need?
At least two, one at each end. If there are several groups on the same rail, extra end stops can be fitted at the group boundaries.
Does the colour of the end stop matter?
No, colour is only a marking. The same colour as the row gives a tidy look; a different colour helps tell groups apart.